Publications (130)
Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy
Nicola Bennert, Bruno Jungwiert, Stefanie Komossa +3
Spatially resolved emission-line spectroscopy is a powerful tool to determine the physical conditions in the narrow-line region (NLR) of active galactic nuclei (AGNs). We recently…
Surface-enhanced Raman scattering and fluorescence near metal nanoparticles
Peter Johansson, Hongxing Xu, Mikael Käll +1
We present a general model study of surface-enhanced resonant Raman scattering and fluorescence, focusing on the interplay between electromagnetic (EM) effects and the molecular dy…
On the distribution of stellar masses in gamma-ray burst host galaxies
J. M. Castro Cerón, M. J. MichaÅowski, J. Hjorth +6
We analyse Spitzer images of 30 long-duration gamma-ray burst (GRB) host galaxies. We estimate their total stellar masses (M*) based on the rest-frame K-band luminosities (L_Krest)…
The Quasar SDSS J1536+0441: An Unusual Double-Peaked Emitter
Ryan Chornock, J. S. Bloom, S. B. Cenko +8
The quasar SDSS J153636.22+044127.0, exhibiting peculiar broad emission-line profiles with multiple components, was proposed as a candidate sub-parsec binary supermassive black hol…
Analysing observed star cluster SEDs with evolutionary synthesis models: Systematic uncertainties
P. Anders, N. Bissantz, U. Fritze-v. Alvensleben +2
We discuss the systematic uncertainties inherent to analyses of observed (broad-band) Spectral Energy Distributions (SEDs) of star clusters with evolutionary synthesis models. We i…
The redshift-space two-point correlation function of galaxy groups in the CfA2 and SSRS2 surveys
M. Girardi, W. Boschin, L. da Costa +1
We measure the two-point redshift-space correlation function of loose groups of galaxies, xi_GG, for the combined CfA2 and SSRS2 surveys. Our combined group catalog constitutes the…
Models for extremely metal-poor halo stars
A. Weiss, H. Schlattl, M. Salaris +2
Two alternative scenarios concerning the origin and evolution of extremely metal-poor halo stars are investigated. The first one assumes that the stars have been completely metal-f…
Center-of-mass effects in electromagnetic two-proton knockout reactions
Carlotta Giusti, Franco Davide Pacati, Michael Schwamb +2
The role of center-of mass (CM) effects in the one-body nuclear current in the description of electromagnetically induced two-nucleon knockout reactions is discussed in connection…
Brackett Lines from the Super Star Cluster Nebulae in He 2-10
Alaina L. Henry, Jean L. Turner, Sara C. Beck +3
We present high spectral resolution (v~12-16 km/s) Brackett line spectroscopy of the blue compact dwarf galaxy Henize 2-10 made with NIRSPEC on the Keck Telescope. The spatial reso…
Properties of the Narrow-Line Region in Seyfert Galaxies
Nicola Bennert, Bruno Jungwiert, Stefanie Komossa +3
We study the narrow-line region (NLR) of six Seyfert-1 and six Seyfert-2 galaxies by means of spatially resolved optical spectroscopy and photoionization modelling. From spatially…
Ultraviolet Through Far-Infrared Spatially Resolved Analysis of the Recent Star Formation in M81 (NGC3031)
Pablo G. Perez-Gonzalez, Robert C. Kennicutt, Karl D. Gordon +14
The recent star formation (SF) in the early-type spiral galaxy M81 is characterized using imaging observations from the far-ultraviolet (UV) to the far-infrared (IR). We compare th…
Toward Mapping the Detailed Density Structure of Classical Be Circumstellar Disks
John P. Wisniewski, Adam F. Kowalski, Karen S. Bjorkman +3
The first results from a near-contemporaneous optical and infrared spectroscopic observing program designed to probe the detailed density structure of classical Be circumstellar di…
The environs of the HII region Gum31
C. Cappa, V. S. Niemela, R. Amorin +2
We analyze the distribution of the interstellar matter in the environs of the \hii region Gum 31, excited by the open cluster NGC 3324, located in the complex Carina region, with t…
3D Simulations of the ISM pollution by SNII and SNI in dwarf spheroidal galaxies
Andrea Marcolini, Fabrizio Brighenti, Annibale D'Ercole +1
We present preliminary results of 3-D hydro simulations of the interstellar medium evolution in dwarf spheroidal galaxies undergoing star formation for the first time. The star for…
Resolving the ionized wind of the post-Red Supergiant IRC +10 420 with VLTI/AMBER
W. J. de Wit, R. D. Oudmaijer, M. A. T. Groenewegen +3
The paper investigates the milli-arcsecond scale structure of the present-day mass-loss of the post-Red Supergiant IRC+10420. We use three telescopes of the VLT Interferometer in c…
X-ray Sources with Periodic Variability in a Deep Chandra Image of the Galactic Center
M. P. Muno, F. K. Baganoff, M. W. Bautz +4
We report the discovery of eight X-ray sources with periodic variability in 487 ks of observations of the Galactic center with Chandra. The sources are identified from a sample of…
Critical Percolation and Transport in Nearly One Dimension
A. N. Samukhin, V. N. Prigodin, L. Jastrabik +1
A random hopping on a fractal network with dimension slightly above one, , is considered as a model of transport for conducting polymers with nonmetallic conductivity.…
The spatially resolved stellar populations of isolated early-type galaxies
Fatma M. Reda, Robert N. Proctor, Duncan A. Forbes +3
We present radial stellar population parameters for a subsample of 12 galaxies from the 36 isolated early-type galaxies of Reda et al. Using new long-slit spectra, central values a…
Alternative diagnostic diagrams and the "forgotten" population of weak line galaxies in the SDSS
R. Cid Fernandes, G. Stasinska, M. S. Schlickmann +5
A numerous population of weak line galaxies (WLGs) is often left out of statistical studies on emission line galaxies (ELGs) due to the absence of an adequate classification scheme…
Milky Way Gas Dynamics
P. Englmaier, O. Gerhard, ;
The Milky Way is made up of a central bar, a disk with embedded spiral arms, and a dark matter halo. Observational and theoretical constraints for the characteristic parameters of…
Optical photometry and basic parameters of 10 unstudied open clusters
Annapurni Subramaniam, Giovanni Carraro, Kenneth A. Janes +1
We present BVI CCD photometry of 10 northern open clusters, Berkeley 43, Berkeley 45, Berkeley 47, NGC 6846, Berkeley 49, Berkeley 51, Berkeley 89, Berkeley 91, Tombaugh 4 and Berk…
Effects of Cosmological Magnetic Helicity on the Cosmic Microwave Background
Tina Kahniashvili, Bharat Ratra, ;
Cosmological magnetic fields induce temperature and polarization fluctuations in the cosmic microwave background (CMB) radiation. A cosmological magnetic field with current amplitu…
X-ray emission of brown dwarfs: Towards constraining the dependence on age, luminosity, and temperature
B. Stelzer, G. Micela, E. Flaccomio +7
Three brown dwarfs in different evolutionary stages have been observed with the Chandra X-ray Observatory. Combining the new observations with previous studies presented in the lit…
Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL
L. Bouchet, M. Del Santo, E. Jourdain +4
The microquasar 1E 1740.7-2942 is observed with Integral since Spring 2003. Here, we report on the source high energy behaviour by using the first three years of data collected wit…
Constraining the star formation histories of GRB Host Galaxies from their observed abundance patterns
F. Calura, M. Dessauges-Zavadsky, J. X. Prochaska +2
Long-duration Gamma Ray Bursts (GRBs) are linked to the collapse of massive stars and their hosts are exclusively identified as active, star forming galaxies. Four long GRBs observ…
GALEX Detection of Lyman Break Galaxies at z=1 in the CDFS
D. Burgarella, P. Perez-Gonzalez, V. Buat +5
The first large sample of Lyman Break Galaxies (LBGs) at z~1 is selected from GALEX Far-UV and Near-UV images of the Chandra Deep Field South. This multi-wavelength study is based…
The Gas Content and Kinematics of Nearby Blue Compact Galaxies: Implications for Studies at Intermediate and High Redshift
D. J. Pisano, Henry A. Kobulnicky, Rafael Guzman +3
We present Arecibo 21 cm spectroscopy, Keck HIRES Hb spectroscopy, and WIYN R-band images of 11 nearby blue compact galaxies selected to be similar to blue compact star-forming gal…
Abundances and physical parameters for stars in the open clusters NGC 5822 and IC 4756
G. Pace, J. Danziger, G. Carraro +5
Classical chemical analyses may be affected by systematic errors that would cause observed abundance differences between dwarfs and giants. For some elements, however, the abundanc…
The HD 163296 Circumstellar Disk in Scattered Light: Evidence of Time-Variable Self-Shadowing
John P. Wisniewski, Mark Clampin, Carol A. Grady +6
We present the first multi-color view of the scattered light disk of the Herbig Ae star HD 163296, based on coronagraphic observations from the Hubble Space Telescope Advanced Came…
Theoretical Implications of the LEP Higgs Search
G. L. Kane, Brent D. Nelson, Lian-Tao Wang +2
We study the implications for the minimal supersymmetric standard model (MSSM) of the absence of a direct discovery of a Higgs boson at LEP. First we exhibit 15 physically differen…
Propagation of Ultra-high-energy Protons in Cosmic Magnetic Fields
Hajime Takami, Katsuhiko Sato, ;
We simulate the arrival distribution of ultra-high-energy (UHE) protons by following their propagation processes in several strengths of a structured extragalactic magnetic field (…
Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
Judit Bakos, Ignacio Trujillo, Michael Pohlen +1
We have explored radial color and stellar surface mass density profiles for a sample of 85 late-type spiral galaxies with deep (down to ~27 mag arcsec^-2) SDSS g'- and r'-band surf…
Periodicity-dependent stiffness of periodic hydrophilic-hydrophobic hetero-polymers
Debashish Chowdhury, Dietrich Stauffer, Reinhard Strey +1
From extensive Monte Carlo simulations of a Larson model of perfectly periodic heteropolymers (PHP) in water a striking stiffening is observed as the period of the alternating hydr…
Electronic structure and rebonding in the onion-like As@Ni12@As20 cluster
Tunna Baruah, Rajendra R. Zope, Steven L. Richardson +2
We present the first ab initio study of the geometry, electronic structure, charged states, bonding and vibrational modes of the recently synthesized fullerene-like As@Ni12@As20 cl…
Enhanced Strange Particle Yields - Signal of a Phase of Massless Particles ?
Sven Soff, D. Zschiesche, M. Bleicher +8
The yields of strange particles are calculated with the UrQMD model for p,Pb(158 AGeV)Pb collisions and compared to experimental data. The yields are enhanced in central collisions…
The potential of INTEGRAL for the detection of high redshift GRBs
J. Gorosabel, N. Lund, S. Brandt +3
We discuss INTEGRAL's capabilities to detect a high redshift population of Gamma-Ray Bursts (GRBs) in comparison to other high-energy missions. Emphasis is done on the study of the…
Why air bubbles in water glow so easily
Michael Brenner, Sascha Hilgenfeldt, Detlef Lohse +1
Sound driven gas bubbles in water can emit light pulses (sonoluminescence). Experiments show a strong dependence on the type of gas dissolved in water. Air is found to be one of th…
Lensing Survey of the Most X-Ray Luminous Galaxy Clusters
W. Kausch, S. Schindler, T. Kronberger +4
We present the first three galaxy clusters of a larger sample of the most X-ray luminous galaxy clusters selected from the ROSAT Bright Survey. This project, which is a systematic…
Chemical clocks for early-type galaxies
C. Carretero, A. Vazdekis, J. E. Beckman +1
We present a detailed stellar population analysis of 27 massive elliptical galaxies within 4 very rich clusters at redshift z~0.2. We obtained accurate estimates of the mean lumino…
Computations of primordial black hole formation
Ilia Musco, John C. Miller, Luciano Rezzolla +1
Results are presented from general relativistic numerical computations of primordial black-hole formation during the radiation-dominated era of the universe. Growing-mode perturbat…
Branching-annihilating random walks in one dimension: Some exact results
K. Mussawisade, J. E. Santos, G. M. Schütz +1
We derive a self-duality relation for a one-dimensional model of branching and annihilating random walkers with an even number of offsprings. With the duality relation and by deriv…
A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
Todd M. Tripp, Kenneth R. Sembach, David V. Bowen +5
Using high-resolution UV spectra of 16 low-z QSOs, we study the physical conditions and statistics of O VI absorption in the IGM at z < 0.5. We identify 51 intervening (z_{abs} <<…
The complex FeK line of the Narrow-Line Seyfert 1 galaxy IRAS13349+2438
A. L. Longinotti, M. Cappi, K. Nandra +3
The observation of the Narrow-Line Seyfert 1 galaxy IRAS13349+2438 performed by XMM-Newton European Photon Imaging Camera between 0.3-10 keV, is presented here. The broadband spect…
In Beam Tests of Implanted Helium Targets
J. E. McDonald, R. H. France, R. A. Jarvis +22
Targets consisting of 3,4He implanted into thin aluminum foils (approximately 100, 200 or 600 ug/cm^2) were prepared using intense (a few uA) helium beams at low energy (approximat…
Fragmentation of Shocked Flows: Gravity, Turbulence and Cooling
F. Heitsch, L. Hartmann, A. Burkert +1
The observed rapid onset of star formation in molecular clouds requires rapid formation of dense fragments which can collapse individually before being overtaken by global gravitat…
A New Mechanism for Gravitational Wave Emission in Core-Collapse Supernovae
Christian D. Ott, Adam Burrows, Luc Dessart +2
We present a new theory for the gravitational wave signatures of core-collapse supernovae. Previous studies identified axisymmetric rotating core collapse, core bounce, postbounce…
Evidence of Star Formation in Local S0 Galaxies: Spitzer Observations of the SAURON Sample
Pasquale Temi, Fabrizio Brighenti, William G. Mathews +1
We discuss infrared Spitzer observations of early type galaxies in the SAURON sample at 24, 60 and 170 microns. When compared with 2MASS Ks band luminosities, lenticular (S0) galax…
Andromeda IV: a new Local Volume very metal-poor galaxy
S. A. Pustilnik, A. L. Tepliakova, A. Y. Kniazev +2
And IV is a low-surface brightness (LSB) dwarf galaxy at the distance of 6.1 Mpc, projecting close to M 31. In this paper the results of spectroscopy of And IV the two brightest HI…
The Role of Evolutionary Age and Metallicity in the Formation of Classical Be Circumstellar Disks I. New Candidate Be Stars in the LMC, SMC, and Milky Way
John P. Wisniewski, Karen S. Bjorkman, ;
We present B, V, R, and H alpha photometry of 8 clusters in the Small Magellanic Cloud, 5 in the Large Magellanic Cloud, and 3 Galactic clusters, and use 2 color diagrams (2-CDs) t…
Resolved Spectroscopy of a Gravitationally Lensed L* Lyman-break Galaxy at z~5
A. M. Swinbank, R. G. Bower, G. P. Smith +6
By combining HST imaging with optical (VIMOS) and near-infrared (SINFONI) integral field spectroscopy we exploit the gravitational potential of a massive, rich cluster at z=0.9 to…
Optical flashes, reverse shocks and magnetization
Andreja Gomboc, Shiho Kobayashi, Carole G. Mundell +8
Despite the pre-Swift expectation that bright optical flashes from reverse shocks would be prevalent in early-time afterglow emission, rapid response observations show this not to…
NGC 146: A young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars
A. Subramaniam, D. K. Sahu, R. Sagar +2
We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146. UBV photometry of 434 stars were used to estimate the E(BV) red…
Morphology and Evolution in Galaxy Clusters I: Simulated Clusters in the Adiabatic limit and with Radiative Cooling
Nurur Rahman, Sergei F. Shandarin, Patrick M. Motl +2
We have studied morphological evolution in clusters simulated in the adiabatic limit and with radiative cooling. Cluster morphology in the redshift range, , is quantif…
The role of black hole spin and magnetic field threading the unstable neutrino disk in Gamma Ray Bursts
Agnieszka Janiuk, Ye-Fei Yuan, ;
We report on the third phase of our study of the neutrino-cooled hyperaccreting torus around a black hole that powers the jet in Gamma Ray Bursts. We focus on the influence of the…
Rest-Frame MIR Detection of an Extremely Luminous Lyman Break Galaxy with the Spitzer IRS
H. I. Teplitz, V. Charmandaris, L. Armus +9
We present the first rest-frame ~4 micron detection of a Lyman break galaxy. The data were obtained using the 16 micron imaging capability of the Spitzer Infrared Spectrograph. The…
A Quest for PMS candidate stars at low metallicity: Variable HAe/Be and Be stars in the Small Magellanic Cloud
W. J. de Wit, J-P. Beaulieu, H. J. G. L. M. Lamers +3
We report the discovery of 5 new Herbig Ae/Be candidate stars in the Small Magellanic Cloud in addition to the 2 reported in Beaulieu et al. (2001). We discuss these 7 HAeBe candid…
On saturation of betatron acceleration of dust particles behind shock fronts
L. V. Kostyukova, V. V. Prudskikh, Yu. A. Shchekinov +1
Possible saturation of betatron acceleration of dust particles behind strong shock fronts from supernovae is considered. It is argued that the efficiency of the nonthermal dust des…
The Unusual Tidal Dwarf Candidate in the Merger System NGC 3227/6: Star Formation in a Tidal Shock?
Carole G. Mundell, Phil A. James, Nora Loiseau +3
We report the discovery of active star formation in the HI cloud associated with the interacting Seyfert system NGC 3227/NGC 3226 that was originally identified as a candidate tida…
Measuring PAH Emission in Ultradeep Spitzer IRS Spectroscopy of High Redshift IR Luminous Galaxies
H. I. Teplitz, V. Desai, L. Armus +10
The study of the dominant population of high redshift IR-luminous galaxies (10^11 - 10^12 Lsun at 1<z<3), requires observation of sources at the ~0.1 mJy level in the mid-IR. We pr…
Testing blend scenarios for extrasolar transiting planet candidates. II. -- OGLE-TR-56
Guillermo Torres, Maciej Konacki, Dimitar D. Sasselov +2
We re-examine the photometric and spectroscopic evidence available for the star OGLE-TR-56, recently discovered to harbor a giant planet presenting transits and orbiting with a per…
Search for Cold Debris Disks around M-dwarfs. II
J. -F. Lestrade, M. C. Wyatt, F. Bertoldi +3
Although 70 % of the stars in the Galaxy are M-dwarfs, thermal emission searches for cold debris disks have been conducted mostly for A-type and solar-type stars. We report on new…
Astrophysical Explosions Driven by a Rotating, Magnetized, Gravitating Sphere
Sean Matt, Adam Frank, Eric G. Blackman +1
We present the results of a numerical magnetohydrodynamic simulation that demonstrates a mechanism by which magnetic fields tap rotational energy of a stellar core and expel the en…
A Unified Grand Canonical Description of The Nonextensive Thermostatistics of The Quantum Gases: Fractal and Fractional Approach
F. Buyukkilic, D. Demirhan, ;
In this paper, the particles of quantum gases, that is, bosons and fermions are regarded as g-ons which obey fractional exclusion statistics. With this point of departure the therm…
gamma Cassiopeiae: an X-ray Be star with personality
Raimundo Lopes de Oliveira, Myron A. Smith, Christian Motch +1
gamma Cassiopeiae (gCas) is a B0.5e star with peculiar X-ray emission properties and yet the prototype of its own small class. In this paper we examine the X-ray spectra for a 2004…
The remarkable light and colour variability of Small Magellanic Cloud Be stars
W. J. de Wit, H. J. G. L. M. Lamers, J. B. Marquette +2
(Abridged) Some 240 blue stars in the Small Magellanic Cloud are investigated on their fantastic irregular continuum variability. We report here two results regarding these stars.…
X-ray emission from a metal depleted accretion shock onto the classical T Tauri star TW Hya
B. Stelzer, J. H. M. M. Schmitt, ;
We present the X-ray spectrum of TW Hya observed at high and intermediate spectral resolution with the Reflection Grating Spectrometer (RGS) and the European Photon Imaging Camera…
The Early (<1 hr) Multi-Color Afterglow of GRB 050502a: Possible Evidence for a Uniform Medium with Density Clumps
C. Guidorzi, A. Monfardini, A. Gomboc +11
The 2-m robotic Liverpool Telescope reacted promptly to the gamma-ray burst GRB 050502a discovered by INTEGRAL and started observing 3 min after the onset of the GRB. The automatic…
Effective forces induced by fluctuating interface: exact results
D. B. Abraham, F. H. L. Essler, A. Maciolek +1
We present exact derivations of the effective capillary wave fluctuation induced forces resulting from pinning of an interface between two coexisting phases at two points separated…
Detection of satellite remnants in the Galactic Halo with Gaia - I. The effect of the Galactic background, observational errors and sampling
Anthony Brown, Hector Velazquez, Luis Aguilar +1
We address the problem of identifying remnants of satellite galaxies in the halo of our galaxy with Gaia data. The remnants have to be extracted from a very large data set (of orde…
Spiral Galaxies in the SAURON Survey
Reynier F. Peletier, Katia Ganda, Jesus Falcon-Barroso +11
We discuss some recent integral field spectroscopy using the SAURON instrument of a sample consisting of 24 early-type spirals, part of the SAURON Survey, and 18 late-type spirals.…
Far-Ultraviolet Imaging of the Hubble Deep Field North: Star Formation in Normal Galaxies at z<1
H. I. Teplitz, B. Siana, T. M. Brown +9
We present far-ultraviolet (FUV) imaging of the Hubble Deep Field North (HDF-N) taken with the Solar Blind Channel of the Advanced Camera for Surveys (ACS/SBC) and the FUV MAMA det…
The SDSS-XMM Quasar Sample: First Results
G. Risaliti, M. Elvis, ;
We have searched in the XMM-Newton public archive for quasars in the Sloan Digital Sky Survey (SDSS) First Data Release (DR1), and found 55 lying in the field of a XMM-Newton obser…
The Universe behind the Southern Milky Way
R. C. Kraan-Korteweg, L. Staveley-Smith, J. Donley +2
A first analysis of a deep blind HI survey covering the southern Zone of Avoidance plus an extension towards the north (196 < l < 52 deg) obtained with the Multibeam receiver at th…
The age of blue LSB galaxies
E. I. Vorobyov, Yu. Shchekinov, D. Bizyaev +3
(Abridged). Low metallicities, large gas-to-star mass ratios, and blue colors of most low surface brightness (LSB) galaxies imply that these systems may be younger than their high…
The radio structure of radio-quiet quasars
Christian Leipski, Heino Falcke, Nicola Bennert +2
We investigate the radio emitting structures of radio-quiet active galactic nuclei with an emphasis on radio-quiet quasars to study their connection to Seyfert galaxies. We present…
The Observational Mass Function of Loose Galaxy Groups
M. Girardi, G. Giuricin, ;
We analyze the three catalogs of nearby loose groups identified by Garcia (1993). She used a percolation and a hierarchical method, and proposed a third group catalog defined as a…
Dwarf Elliptical Galaxies in the Perseus Cluster
J. S. Gallagher, C. J. Conselice, R. F. G. Wyse +3
Dwarf ellipticals have the lowest stellar densities of any galaxies, but paradoxically are most common in the densest regions of the universe, and are especially frequent in rich c…
The BeppoSAX X-ray spectrum of the remnant of SN 1006
Jacco Vink, Jelle S. Kaastra, Johan A. M. Bleeker +2
We present BeppoSAX X-ray spectra of the remnant of the supernova of AD 1006, which cover a broad spectral range of 0.1-10 keV. In our analysis we concentrate on the thermal emissi…
Pion Interferometry at RHIC: Probing a thermalized Quark-Gluon-Plasma?
Sven Soff, Steffen A. Bass, Adrian Dumitru +1
We calculate the Gaussian radius parameters of the pion-emitting source in high energy heavy ion collisions, assuming a first order phase transition from a thermalized Quark-Gluon-…
Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
B. Mookerjea, E. Casper, L. G. Mundy +2
(abridged) We present high angular resolution (~ 1") multi-tracer spectral line observations toward the hot core associated with G34.26+0.15 between 87--109 GHz. We have mapped emi…
Three Dimensional Compressible Hydrodynamic Simulations of Vortices in Disks
Yue Shen, James M. Stone, Thomas A. Gardiner +1
We carry out three-dimensional, high resolution (up to ) hydrodynamic simulations of the evolution of vortices in vertically unstratified Keplerian disks using th…
X-ray Cluster Associated with the z=1.063 CSS Quasar 3C 186: The Jet is NOT Frustrated
Aneta Siemiginowska, C. C. Cheung, Stephanie LaMassa +6
We report the Chandra discovery of an X-ray cluster at redshift z = 1.063 associated with the Compact Steep Spectrum radio loud quasar 3C 186 (Q0740+380). Diffuse X-ray emission is…
Coupled nanopillar waveguides: optical properties and applications
Dmitry N. Chigrin, Sergei V. Zhukovsky, Andrei V. Lavrinenko +2
In this paper we review basic properties of coupled periodic and aperiodic nanopillar waveguides. A coupled nanopillar waveguide consists of several rows of periodically or aperiod…
High Resolution Radio Maps of Four Nearby Spiral Galaxies
Chao-Wei Tsai, Jean L. Turner, Sara C. Beck +4
We report subarcsecond-resolution VLA imaging of the centers of four nearby spiral galaxies: IC 342, Maffei II, NGC 2903, and NGC 6946. In each galaxy, 7 - 12 compact radio continu…
Selection and jump rules in electronic Raman scattering from GaAs/Al_{x}Ga_{1-x}As artificial atoms
Alain Delgado, Augusto Gonzalez, D. J. Lockwood +1
A theoretical description of electronic Raman scattering from GaAs/Al_{x}Ga_{1-x}As artificial atoms under the influence of an external magnetic field is presented. Raman spectra w…
The Magnetic Field Structure of the LMC 2 Supershell: NGC 2100
John P. Wisniewski, Karen S. Bjorkman, Antonio M. Magalhaes +2
We present U,B,V,R,I imaging polarimetry of NGC 2100 and its surrounding environment, which comprise a part of the LMC 2 supershell. The morphology of the observed position angle d…
The Astrobiology Primer: An Outline of General Knowledge - Version 1, 2006
L. J. Mix, J. C. Armstrong, A. M. Mandell +20
Astrobiology, the study of life as a planetary phenomenon, aims to understand the fundamental nature of life on earth and the possibility of life elsewhere. To achieve this goal, a…
Rest frame light curves of Swift GRBs
V. Mangano, V. La Parola, E. Troja +12
We have computed the luminosity rest frame light curves of the first 40 Gamma-ray bursts (GRBs) detected by Swift with well established redshift. We studied average properties of t…
HD 98618: A Star Closely Resembling our Sun
Jorge Melendez, Katie Dodds-Eden, Jose A. Robles +4
Despite the observational effort carried out in the last few decades, no perfect solar twin has been found to date. An important milestone was achieved a decade ago by Porto de Mel…
Unusual direction dependence of exchange energies in GaAs:Mn - Is the RKKY description relevant
Priya Mahadevan, Alex Zunger, D. D. Sarma +1
Ferromagnetism in Mn-doped GaAs, the prototypical dilute magnetic semiconductor, has so far been attributed to hole mediated RKKY-type interactions. First-principles calculations r…
16 micron Imaging around the Hubble Deep Field North with the Spitzer IRS
H. I. Teplitz, V. Charmandaris, R. Chary +4
We present a pilot study of 16 micron imaging within the GOODS northern field. Observations were obtained using the PeakUp imaging capability of the Spitzer IRS. We survey 35 squar…
Pile-up correction for the Swift-XRT observations in WT mode
T. Mineo, P. Romano, V. Mangano +12
The detector at the focal plane of the Swift X-ray Telescope (XRT) supports four readout modes, automatically changed on board, to cover the dynamical range of fluxes and rapid var…
Relating Incomplete Data and Incomplete Theory
Pierre Binetruy, G. L. Kane, Brent D. Nelson +3
Assuming string theorists will not soon provide a compelling case for the primary theory underlying particle physics, the field will proceed as it has historically: with data stimu…
CGCG 480-022: A distant lonesome merger?
C. Carretero, A. Vazdekis, C. Gonzalez-Garcia +3
We present a complete analysis, which includes morphology, kinematics, stellar populations and N-body simulations of CGCG 480-022, the most distant (cz=14317 km/s) isolated galaxy…
Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
M. Jura, J. Farihi, B. Zuckerman +2
We report Spitzer Space Telescope photometry between 3.6 microns and 24 microns and spectroscopy between 5 microns and 15 microns of GD 362, a white dwarf with an effective tempera…
[CI] 492 GHz mapping toward Cas A
B. Mookerjea, N. G. Kantharia, D. A. Roshi +2
We have mapped the [C I] emission at 492 GHz toward the supernova remnant Cas A. We detect [C I] emission from the periphery of the diffuse Photon Dominated Region (PDR) covering t…
Structure Generation by Irradiation: What can GLIMPSE teach us about the ISM structure?
F. Heitsch, B. Whitney, R. Indebetouw +4
Diffuse emission in the mid-infrared shows a wealth of structure, that lends itself to high-resolution structure analysis of the interstellar gas. A large part of the emission come…
Unveiling the Behavior of the Ionized Gas in Irregular Galaxies
Margarita Valdez-Gutierrez, Margarita Rosado, ;
We present the results of a detailed kinematical and dynamical analysis performed in two highly interesting gas-rich Irregular galaxies (Irrs): IC 1613 and NGC 4449. The analysis h…
Polarized Cosmological Gravitational Waves from Primordial Helical Turbulence
Tina Kahniashvili, Grigol Gogoberidze, Bharat Ratra +1
We show that helical turbulence produced during a first-order phase transition generates circularly polarized cosmological gravitational waves (GWs). The characteristic frequency o…
On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter
Raimundo Lopes de Oliveira, Christian Motch, Myron A. Smith +3
(ABRIDGED) - HD 110432 is the first proposed, and best studied, member of a growing group of Be stars with X-ray properties similar to gamma Cas. These stars exhibit hard-thermal X…