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1,773 papers · 1 filter
A Wide-Field Study of the z~0.8 Cluster RX J0152.7-1357: the Role of Environment in the Formation of the Red-Sequence
Shannon G. Patel, Daniel D. Kelson, Bradford P. Holden +4
[ABRIDGED] We present the first results from the largest spectroscopic survey to date of an intermediate redshift galaxy cluster, the z=0.834 cluster RX J0152.7-1357. We use the co…
He II absorption and the sawtooth spectrum of the cosmic far-UV background
Piero Madau, Francesco Haardt
Cosmic ultraviolet background radiation between 3 and 4 Ryd is reprocessed by resonant line absorption in the Lyman series of intergalactic He II. This process results in a sawtoot…
The Connection between a Lyman Limit System, a very strong OVI Absorber, and Galaxies at z~0.203
N. Lehner, J. X. Prochaska, H. A. Kobulnicky +4
With a column density log N(OVI) = 14.95+/-0.05, the OVI absorber at z_abs~0.2028 observed toward the QSO PKS0312-77 (z_em=0.223) is the strongest yet detected at z<0.5. At nearly…
On the release of binding energy and accretion power in core collapse-like environments
Aristotle Socrates, Enrico Ramirez-Ruiz
All accretion models of gamma-ray bursts share a common assumption: accretion power and gravitational binding energy is released and then dissipated locally, with the mass of its o…
A Comparison of Six Photometric Redshift Methods Applied to 1.5 Million Luminous Red Galaxies
Filipe B. Abdalla, Manda Banerji, Ofer Lahav +1
We present an updated version of MegaZ-LRG (Collister et al.,(2007)) with photometric redshifts derived with the neural network method, ANNz as well as five other publicly availabl…
Massive Black Hole Recoil in High Resolution Hosts
Javiera Guedes, Jürg Diemand, Marcel Zemp +4
The final inspiral and coalescence of a black hole binary can produce highly beamed gravitational wave radiation. To conserve linear momentum, the black hole remnant can recoil wit…
Fermi LAT Observations of the Vela Pulsar
A. A. Abdo
The Vela pulsar is the brightest persistent source in the GeV sky and thus is the traditional first target for new gamma-ray observatories. We report here on initial Fermi Large Ar…
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…
The Graininess of Dark Matter Haloes
Marcel Zemp, Jürg Diemand, Michael Kuhlen +5
We use the recently completed one billion particle Via Lactea II LambdaCDM simulation to investigate local properties like density, mean velocity, velocity dispersion, anisotropy,…
A HST/WFPC2 survey of bright young clusters in M31. I. VdB0, a massive star cluster seen at ~= 25 Myr
S. Perina, P. Barmby, M. A. Beasley +12
{Aims.} We introduce our imaging survey of possible young massive globular clusters in M31 performed with the Wide Field and Planetary Camera 2 (WFPC2) on the Hubble Space Telescop…
The June 2008 flare of Markarian 421 from optical to TeV energies
The Agile Collaboration, Webt Collaboration, Magic Collaboration +2
We present optical, X-ray, high energy ( GeV) and very high energy ( GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken betwee…
HATNet Field G205: Follow-Up Observations of 28 Transiting-Planet candidates and Confirmation of the Planet HAT-P-8b
David W. Latham, Gáspár Á. Bakos, Guillermo Torres +16
We report the identification of 32 transiting-planet candidates in HATNet field G205. We describe the procedures that we have used to follow up these candidates with spectroscopic…
A Surprisingly High Pair Fraction for Extremely Massive Galaxies at z ~ 3 in the GOODS NICMOS Survey
Asa F. L. Bluck, Christopher J. Conselice, Rychard J. Bouwens +4
We calculate the major pair fraction and derive the major merger fraction and rate for 82 massive () galaxies at utilising deep HST NICMOS d…
Discovery of Very High-Energy Gamma-Ray Radiation from the BL Lac 1ES 0806+524
VERITAS Collaboration, V. Acciari, E. Aliu +90
The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November…
Characterization of the HD 17156 planetary system
M. Barbieri, R. Alonso, S. Desidera +11
AIMS : To improve the parameters of the HD 17156 system (peculiar due to the eccentric and long orbital period of its transiting planet) and constrain the presence of stellar compa…
The Shapes of Molecular Cloud Cores in Simulations and Observations
S. S. R. Offner, M. R. Krumholz
In this study, we investigate the shapes of starless and protostellar cores using hydrodynamic, self-gravitating adaptive mesh refinement simulations of turbulent molecular clouds.…
Type I Planet Migration in Nearly Laminar Disks
H. Li, S. H. Lubow, S. Li +1
We describe 2D hydrodynamic simulations of the migration of low-mass planets () in nearly laminar disks (viscosity parameter ) over timescales of se…
Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
Stefano Profumo
We argue that both the positron fraction measured by PAMELA and the peculiar spectral features reported in the total electron-positron (e+e-) flux measured by ATIC have a very natu…
The origin of the diffuse non-thermal X-ray and radio emission in the Ophiuchus cluster of galaxies
Miguel A. Perez-Torres, Fabio Zandanel, Martin A. Guerrero +4
We present high resolution 240 and 607 MHz GMRT radio observations, complemented with 74 MHz archival VLA radio observations of the Ophiuchus cluster of galaxies, whose radio mini-…
Constraining the energy budget of GRB 080721
R. L. C. Starling, E. Rol, A. J. van der Horst +17
We follow the bright, highly energetic afterglow of Swift-discovered GRB 080721 at z=2.591 out to 36 days or 3e6 s since the trigger in the optical and X-ray bands. We do not detec…
The Seventh Data Release of the Sloan Digital Sky Survey
K. Abazajian
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDS…
Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark Matter
Tesla E. Jeltema, John Kehayias, Stefano Profumo
Clusters of galaxies have not yet been detected at gamma-ray frequencies; however, the recently launched Fermi Gamma-ray Space Telescope, formerly known as GLAST, could provide the…
Forming a Large Disc Galaxy from a z<1 Major Merger
F. Governato, C. B. Brook, A. M. Brooks +8
Using high resolution SPH simulations in a fully cosmological Lambda CDM context we study the formation of a bright disk dominated galaxy that originates from a "wet" major merger…
The Atomic to Molecular Transition in Galaxies. II: HI and H_2 Column Densities
Mark R. Krumholz, Christopher F. McKee, Jason Tumlinson
Gas in galactic disks is collected by gravitational instabilities into giant atomic-molecular complexes, but only the inner, molecular parts of these structures are able to collaps…