Showing 2005 · astro-phShow all

112 papers · 2 filters

astro-ph2005★ 104 cited

G359.95-0.04: Pulsar Candidate Near Sgr A*

Q. D. Wang, F. J. Lu, E. V. Gotthelf

We report the discovery of a prominent nonthermal X-ray feature located near the Galactic center that we identify as an energetic pulsar wind nebula. This feature, G359.95-0.04, li…

astro-ph2005★ 10 cited

Chandra X-ray Observations of Galaxies in an Off-Center Region of the Coma Cluster

A. E. Hornschemeier, B. Mobasher, D. M. Alexander +4

We have performed a pilot Chandra survey of an off-center region of the Coma cluster to explore the X-ray properties and Luminosity Function of normal galaxies. We present results…

astro-ph2005★ 40 cited

Neutron-loaded outflows in gamma-ray bursts

Elena M. Rossi, Andrei M. Beloborodov, Martin J. Rees

Relativistic neutron-loaded outflows in gamma-ray bursts are studied at their early stages, before deceleration by a surrounding medium. The outflow has four components: radiation,…

astro-ph2005★ 27 cited

Techniques for measuring atmospheric aerosols at the High Resolution Fly's Eye experiment

The HiRes Collaboration

We describe several techniques developed by the High Resolution Fly's Eye experiment for measuring aerosol vertical optical depth, aerosol horizontal attenuation length, and aeroso…

astro-ph2005★ 65 cited

Discovery of the X-ray Counterpart to the Rotating Radio Transient J1819--1458

S. P. Reynolds, K. J. Borkowski, B. M. Gaensler +10

We present the discovery of the first X-ray counterpart to a Rotating RAdio Transient (RRAT) source. RRAT J1819--1458 is a relatively highly magnetized (B G)…

astro-ph2005★ 18 cited

The Effect of the Transit of Venus on ACRIM's Total Solar Irradiance Measurements: Implications for Transit Studies of Extrasolar Planets

G. Schneider, J. M. Pasachoff, R. C. Willson

We used the 8 June 2004 transit of Venus (ToV) as a surrogate to test observing methods, strategies and techniques that are being contemplated for future space missions to detect a…

astro-ph2005★ 29 cited

Discovery of Counter-Rotating Gas in the Galaxies NGC1596 and NGC3203 and the Incidence of Gas Counter-Rotation in S0 Galaxies

M. Bureau, A. Chung

We have identified two new galaxies with gas counter-rotation (NGC1596 and NGC3203) and have confirmed similar behaviour in another one (NGC128), this using results from separate s…

astro-ph2005

High Shear Regions in Weak Lensing Surveys Determine Cosmology

Sheng Wang, Zoltan Haiman, Morgan May +1

We propose to use a simple observable, the fractional area of "hot spots" in weak lensing mass maps which are detected with high significance, to determine background cosmological…

astro-ph2005★ 64 cited

Model selection as a science driver for dark energy surveys

Pia Mukherjee, David Parkinson, Pier Stefano Corasaniti +2

A key science goal of upcoming dark energy surveys is to seek time evolution of the dark energy. This problem is one of {\em model selection}, where the aim is to differentiate bet…

astro-ph2005★ 249 cited

Correlated Fluctuations in Luminosity Distance and the (Surprising) Importance of Peculiar Motion in Supernova Surveys

Lam Hui, Patrick B. Greene

Large scale structure introduces two different kinds of errors in the luminosity distance estimates from standardizable candles such as supernovae Ia (SNe) - a Poissonian scatter f…

astro-ph2005★ 17 cited

The Duck Redux: An Improved Proper Motion Upper Limit for the Pulsar B1757-24 Near the Supernova Remnant G5.4-1.2

J. A. Blazek, B. M. Gaensler, S. Chatterjee +3

"The Duck" is a complicated non-thermal radio system, consisting of the energetic radio pulsar B1757-24, its surrounding pulsar wind nebula G5.27-0.90 and the adjacent supernova re…

astro-ph2005★ 116 cited

Simulating Star Formation and Feedback in Galactic Disk Models

Elizabeth J. Tasker, Greg L. Bryan

We use a high-resolution grid-based hydrodynamics method to simulate the multi-phase interstellar medium in a Milky Way-size quiescent disk galaxy. The models are global and three-…

astro-ph2005★ 204 cited

A Near-Infrared Spectral Template for Quasars

Eilat Glikman, David J. Helfand, Richard L. White

We present a near-infrared quasar composite spectrum spanning the wavelength range 0.58 - 3.5 um. The spectrum has been constructed from observations of 27 quasars obtained at the…

astro-ph2005★ 644 cited

Transient radio bursts from rotating neutron stars

M. A. McLaughlin, A. G. Lyne, D. R. Lorimer +11

The `radio sky' is relatively unexplored for transient signals, although the potential of radio-transient searches is high, as demonstrated recently by the discovery of a previousl…

astro-ph2005★ 135 cited

The young, highly relativistic binary pulsar J1906+0746

D. R. Lorimer, I. H. Stairs, P. C. C. Freire +33

We report the discovery of PSR J1906+0746, a young 144-ms pulsar in a highly relativistic 3.98-hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence ti…

astro-ph2005★ 243 cited

Infrared power-law galaxies in the Chandra Deep Field South: AGN and ULIRGs

A. Alonso-Herrero, P. G. Perez-Gonzalez, D. M. Alexander +12

We investigate the nature of a sample of 92 Spitzer/MIPS 24 micron selected galaxies in the CDFS, showing power law-like emission in the Spitzer/IRAC 3.6-8 micron bands. The main g…

astro-ph2005★ 48 cited

A Spectroscopic Analysis of Blue Stragglers, Horizontal Branch and Turn-Off Stars in Four Globular Clusters

Orsola De Marco, Michael M. Shara, D. Zurek +4

We present a spectroscopic analysis of HST/STIS and FOS low- and intermediate-resolution spectroscopy of 55 stars (turn-off stars, horizontal branch stars and blue stragglers) in f…

astro-ph2005★ 30 cited

Photometric Identification of Type Ia Supernovae at Moderate Redshift

Benjamin D. Johnson, Arlin P. S. Crotts

Large photometric surveys with the aim of identifying many Type Ia supernovae (SNe) at moderate redshift are challenged in separating these SNe from other SN types. We are motivate…

astro-ph2005★ 326 cited

Spitzer Observations of Massive Red Galaxies at High Redshift

Casey Papovich, L. A. Moustakas, M. Dickinson +18

We investigate the properties of massive galaxies at z=1-3.5 using HST observations, ground-based near-IR imaging, and Spitzer Space Telescope observations at 3-24 micron. We ident…

astro-ph2005★ 314 cited

The baseline intracluster entropy profile from gravitational structure formation

G. Mark Voit, Scott T. Kay, Greg L. Bryan

The radial entropy profile of the hot gas in clusters of galaxies tends to follow a power law in radius outside of the cluster core. Here we present a simple formula giving both th…

astro-ph2005★ 289 cited

Super-acceleration as Signature of Dark Sector Interaction

Subinoy Das, Pier Stefano Corasaniti, Justin Khoury

We show that an interaction between dark matter and dark energy generically results in an effective dark energy equation of state of w<-1. This arises because the interaction alter…

astro-ph2005★ 15 cited

Testing Dark Energy with the Advanced Liquid-Mirror Probe of Asteroids, Cosmology and Astrophysics

Pier Stefano Corasaniti, Marilena LoVerde, Arlin Crotts +1

The Advanced Liquid-Mirror Probe of Asteroids, Cosmology and Astrophysics (ALPACA) is a proposed 8-meter liquid mirror telescope surveying 1000 square degree of the southern-hemisp…

astro-ph2005★ 36 cited

X-Ray Spectral Variability During an Outburst in V1118 Ori

M. Audard, M. Guedel, S. L. Skinner +5

We present results from a multi-wavelength campaign to monitor the 2005 outburst of the low-mass young star V1118 Ori. Although our campaign covers the X-ray, optical, infrared, an…

astro-ph2005★ 2 cited

Causes and Consequences of Magnetic Field Changes in Neutron Stars

M. Ruderman

Because of the quantum fluid properties of a neutron star core's neutrons and protons, its magnetic field is expected to be coupled strongly to its spin. This predicts a simple evo…