809 citations · 28.2k across the 927 of their papers we have counts for
25 papers · 2 filters
The continuum and narrow line region of the NLS1 galaxy Mrk 766
A. Rodriguez-Ardila, M. Contini, S. M. Viegas
We present the first spectroscopic observations in the interval 0.8-4.0 microns, complemented with HST/UV and optical spectroscopy, of the narrow line Seyfert 1 galaxy Mrk766. The…
Group, field and isolated early-type galaxies II. Global trends from nuclear data
Glenda Denicolo, Roberto Terlevich, Elena Terlevich +2
We have derived ages, metallicities and enhanced-element ratios [alpha/Fe] for a sample of 83 early-type galaxies essentially in groups, the field or isolated objects. The stellar…
Thermonuclear supernova models, and observations of Type Ia supernovae
E. Bravo, C. Badenes, D. Garcia-Senz
In this paper, we review the present state of theoretical models of thermonuclear supernovae, and compare their predicitions with the constraints derived from observations of Type…
Subluminous O stars from the ESO Supernova Progenitor Survey - Observation versus Theory
A. Stroeer, U. Heber, T. Lisker +2
The ESO Supernova Progenitor Survey (SPY) has identified 58 (mostly helium-rich) subluminous O stars. We use the Balmer line strength to distinguish sdO from He-sdO (no Balmer line…
The cluster-scale AGN outburst in Hydra A
P. E. J. Nulsen, B. R. McNamara, M. W. Wise +1
Deep Chandra observations of the Hydra A Cluster reveal a feature in the X-ray surface brightness that surrounds the 330 MHz radio lobes of the AGN at the cluster center. Surface b…
Giant Pulses from PSR B1937+21 with widths <= 15 nanoseconds and T_b >= 5 x 10^39 K, the Highest Brightness Temperature Observed in the Universe
V. A. Soglasnov, M. V. Popov, N. Bartel +4
Giant radio pulses of the millisecond pulsar B1937+21 were recorded with the S2 VLBI system at 1.65 GHz with NASA/JPL's 70-m radio telescope at Tidbinbilla, Australia. These pulses…
A Reexamination of Electron Density Diagnostics for Ionized Gaseous Nebulae
W. Wang, X. -W. Liu, Y. Zhang +1
We present a comparison of electron densities derived from optical forbidden line diagnostic ratios for a sample of over a hundred nebulae. We consider four density indicators, the…
The Chandra view of NGC1800 and the X-ray scaling properties of dwarf starbursts
Jesper Rasmussen, Ian R. Stevens, Trevor J. Ponman
The superb spatial resolution of Chandra is utilized to study the X-ray morphology of the dwarf starburst galaxy NGC1800 embedded in a small group of galaxies. Diffuse galactic emi…
Keck Adaptive Optics Imaging of 0.5<z<1 Field Galaxies from the Hubble Space Telescope Archive
Eric Steinbring, A. J. Metevier, Stuart A. Norton +6
We have employed natural guide star adaptive optics (AO) on the Keck II telescope to obtain near-infrared (H and K') images of three field galaxies, each of redshift greater than 0…
Near-IR speckle imaging of massive young stellar objects
C. Alvarez, M. Hoare, A. Glindemann +1
We present near-IR speckle images of 21 massive Young Stellar Objects (YSOs) associated with outflows. The aim of this study is to search for sub-arcsecond reflection nebulae assoc…
Molecular Hydrogen and [FeII] in Active Galactic Nuclei
Alberto Rodriguez-Ardila, Miriani G. Pastoriza, Sueli Viegas +2
(Abridge) Near-infrared spectroscopy is used to study the kinematics and excitation mechanisms of the H2 and [FeII] gas in a sample of AGN. The H2 lines are unresolved in all objec…
The Clustering of AGN in the Sloan Digital Sky Survey
David A. Wake, Christopher J. Miller, Tiziana Di Matteo +6
We present the two--point correlation function (2PCF) of narrow-line active galactic nuclei (AGN) selected within the First Data Release of the Sloan Digital Sky Survey. Using a sa…
An 850 Micron SCUBA Survey of the HDF-N GOODS Region
W. -H. Wang, L. L. Cowie, A. J. Barger
The Hubble Deep Field-North (HDF-N) is one of the best studied extragalactic fields, and ultra-deep optical, radio, X-ray, and mid-infrared wide-field images are available for this…
X-ray emission from a brown dwarf in the Pleiades
K. R. Briggs, J. P. Pye
We report the first detection of X-ray emission from a brown dwarf in the Pleiades, the M7-type Roque 14, obtained using the EPIC detectors on XMM-Newton. This is the first X-ray d…
The double main sequence of Omega Centauri
L. R. Bedin, G. Piotto, J. Anderson +4
Recent, high precision photometry of Omega Centauri, the biggest Galactic globular cluster, has been obtained with Hubble Space Telescope. The color magnitude diagram reveals an un…
Oscillator strengths for transitions to Rydberg levels in , and between 967 and 972 A
M. Eidelsberg, J. L. Lemaire, J. H. Fillion +3
Absorption oscillator strengths have been determined from high-resolution spectra in the 967-972 Åregion of three CO isotopomers for transitions to the Rydberg levels 4{\it p}(0…
Photoionization Modeling and the K Lines of Iron
T. R. Kallman, P. Palmeri, M. A. Bautista +2
We calculate the efficiency of iron K line emission and iron K absorption in photoionized models using a new set of atomic data. These data are more comprehensive than those previo…
The case for non-gaussianity on cluster scales
H. Mathis, J. M. Diego, Joseph Silk
We address whether possible scale-dependent deviations from gaussianity in the primordial density field that are consistent with the cosmic microwave background observations could…
The locality of transport in self-gravitating accretion discs
G. Lodato, W. K. M. Rice
In this paper we examine the issue of characterising the transport associated with gravitational instabilities in relatively cold discs, discussing in particular the conditions und…
Early Estimation of Microlensing Event Magnifications
Michael D. Albrow
Gravitational microlensing events with high peak magnifications provide a much enhanced sensitivity to the detection of planets around the lens star. However, estimates of peak mag…
Probing Kolmogorov turbulence beyond the Magellanic Clouds: The Power of Southern Hemisphere's largest optical telescope (11m), SALT
D. L. Block, B. G. Elmegreen, D. M. Elmegreen +1
The Hubble classification scheme of galaxies is based on blue-light appearance. Atlases reveal the rich variety of responses of the Population I component (`the mask') of gas and d…
The Top Ten solar analogs in the ELODIE library
C. Soubiran, A. Triaud
Several solar analogs have been identified in the library of high resolution stellar spectra taken with the echelle spectrograph ELODIE. A purely differential method has been used,…
New Period-Luminosity and Period-Color Relations of Classical Cepheids: II. Cepheids in LMC
A. Sandage, G. A. Tammann, B. Reindl
Photometric data for 593 Cepheids in the LMC, measured by Udalski et al. in the OGLE survey, augmented by 92 longer period Cepheids from other sources, are analyzed for the P-C and…
Distribution of magnetically confined circumstellar matter in oblique rotators
O. Preuss, M. Schuessler, V. Holzwarth +1
We consider the mechanical equilibrium and stability of matter trapped in the magnetosphere of a rapidly rotating star. Assuming a dipolar magnetic field and arbitrary inclination…