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1,352 papers · 1 filter

astro-ph2008★ 140 cited

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…

astro-ph2008★ 112 cited

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…

astro-ph2008★ 60 cited

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…

astro-ph2008★ 297 cited

Untwisting magnetospheres of neutron stars

Andrei M. Beloborodov

Magnetospheres of neutron stars are anchored in the rigid crust and can be twisted by sudden crustal motions ("starquakes"). The twisted magnetosphere does not remain static and gr…

astro-ph2008★ 130 cited

The Disruption and Fueling of M33

M. E. Putman, J. E. G. Peek, A. Muratov +7

The disruption of the M33 galaxy is evident from its extended gaseous structure. We present new data from the Galactic Arecibo L-Band Feed Array HI (GALFA-HI) Survey that show the…

astro-ph2008★ 22 cited

Radiative Feedback in Relic HII Regions at High-Redshift

Andrei Mesinger, Greg L. Bryan, Zoltan Haiman

UV radiation from early astrophysical sources could have a large impact on subsequent star formation in nearby protogalaxies. Here we study the radiative feedback from the first, s…

astro-ph2008★ 26 cited

The structure of correlation functions in single field inflation

Sarah Shandera

Many statistics available to constrain non-Gaussianity from inflation are simplest to use under the assumption that the curvature correlation functions are hierarchical. That is, i…

astro-ph2008★ 5.4k cited

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…

astro-ph2008★ 68 cited

CMBPol Mission Concept Study: Gravitational Lensing

Kendrick M. Smith, Asantha Cooray, Sudeep Das +10

Gravitational lensing of the cosmic microwave background by large-scale structure in the late universe is both a source of cosmological information and a potential contaminant of p…

astro-ph2008★ 46 cited

PSR J1753-2240: A mildly recycled pulsar in an eccentric binary system

M. J. Keith, M. Kramer, A. G. Lyne +5

We report the discovery of PSR J1753-2240 in the Parkes Multibeam Pulsar Survey database. This 95-ms pulsar is in an eccentric binary system with a 13.6-day orbital period. Period…

astro-ph2008★ 65 cited

Identifying Decaying Supermassive Black Hole Binaries from their Variable Electromagnetic Emission

Zoltán Haiman, Bence Kocsis, Kristen Menou +2

Supermassive black hole binaries (SMBHBs) with masses in the range 10^4-10^7 M_sun/(1+z), produced in galaxy mergers, are thought to complete their coalescence due to the emission…

astro-ph2008★ 13 cited

Gamma-ray luminosity function of Gamma-ray bright AGNs

D. Bhattacharya, P. Sreekumar, R. Mukherjee

Detection of Gamma-ray emission from a class of active galactic nuclei (viz blazars), has been one of the important findings from the Compton Gamma Ray Observatory (CGRO). However,…

astro-ph2008★ 125 cited

Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Bayesian Estimation of CMB Polarization Maps

J. Dunkley, D. N. Spergel, E. Komatsu +17

We describe a sampling method to estimate the polarized CMB signal from observed maps of the sky. We use a Metropolis-within-Gibbs algorithm to estimate the polarized CMB map, cont…

astro-ph2008★ 303 cited

CMBPol Mission Concept Study: Probing Inflation with CMB Polarization

Daniel Baumann, Mark G. Jackson, Peter Adshead +56

We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of inflation. We focus on the prospects for using CMB measu…

astro-ph2008★ 82 cited

CMBPol Mission Concept Study: Prospects for polarized foreground removal

J. Dunkley, A. Amblard, C. Baccigalupi +28

In this report we discuss the impact of polarized foregrounds on a future CMBPol satellite mission. We review our current knowledge of Galactic polarized emission at microwave freq…

astro-ph2008★ 174 cited

Dependence of Interstellar Turbulent Pressure on Supernova Rate

M. Ryan Joung, Mordecai-Mark Mac Low, Greg L. Bryan

Feedback from massive stars is one of the least understood aspects of galaxy formation. We perform a suite of vertically stratified local interstellar medium (ISM) simulations in w…

astro-ph2008★ 134 cited

Arecibo Pulsar Survey Using ALFA: Probing Radio Pulsar Intermittency and Transients

J. S. Deneva, J. M. Cordes, M. A. McLaughlin +23

We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) Survey of the Galactic plane. We have discovered seven objects by…

astro-ph2008★ 75 cited

Long period planets from dynamical relaxation

Caleb Scharf, Kristen Menou

Recent imaging campaigns indicate the likely existence of massive planets (~ 1-10 MJ) on ~1000 year orbits about a few percent of stars. Such objects are not easily explained in mo…

astro-ph2008★ 43 cited

Low-Velocity Halo Clouds

J. E. G. Peek, Carl Heiles, M. E. Putman +1

Models that reproduce the observed high-velocity clouds (HVCs) also predict clouds at lower radial velocities that may easily be confused with Galactic disk (|z| < 1 kpc) gas. We d…

astro-ph2008★ 220 cited

GRB 080913 at redshift 6.7

J. Greiner, T. Kruehler, J. P. U. Fynbo +44

We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND which led to the discovery of its optical/NIR afterglow and…

astro-ph2008★ 48 cited

High-Resolution Timing Observations of Spin-Powered Pulsars with the AGILE Gamma-Ray Telescope

A. Pellizzoni, M. Pilia, A. Possenti +67

AGILE is a small gamma-ray astronomy satellite mission of the Italian Space Agency dedicated to high-energy astrophysics launched in 2007 April. Its 1 microsecond absolute time tag…

astro-ph2008★ 18 cited

On the Origin of TeV Gamma-ray Emission from HESS J1834-087

R. Mukherjee, E. V. Gotthelf, J. P. Halpern

We present an X-ray study of the field containing the extended TeV source HESS J1834-087 using data obtained with the XMM-Newton telescope. Previously, the coincidence of this sour…

astro-ph2008★ 38 cited

LCDM Satellites and HI Companions - The Arecibo ALFA Survey of NGC 2903

J. A. Irwin, G. L. Hoffman, K. Spekkens +11

We have conducted a deep, complete HI survey, using Arecibo/ALFA, of a field centered on the nearby, isolated galaxy, NGC 2903, which is similar to the Milky Way in its properties.…

astro-ph2008★ 67 cited

A planetary nebula around nova V458 Vul undergoing flash ionization

R. Wesson, M. J. Barlow, R. L. M. Corradi +25

Nova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. H images obtained six weeks before the outburst as part of the IPHAS galactic pl…