Showing 2012 · astro-ph.HEShow all

93 papers · 2 filters

astro-ph.HE2012★ 44 cited

Discovery of TeV Gamma-ray Emission from CTA 1 by VERITAS

E. Aliu, S. Archambault, T. Arlen +88

We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+…

astro-ph.HE2012★ 102 cited

Constraints on the origin of cosmic rays above eV from large scale anisotropy searches in data of the Pierre Auger Observatory

Pierre Auger Collaboration

A thorough search for large scale anisotropies in the distribution of arrival directions of cosmic rays detected above eV at the Pierre Auger Observatory is reported. For…

astro-ph.HE2012★ 82 cited

X-ray properties of the Northern Galactic Cap AGNs in the 58-month Swift-BAT catalog

Ranjan V. Vasudevan, William N. Brandt, Richard F. Mushotzky +5

We present a detailed X-ray spectral analysis of a complete sample of hard X-ray selected AGN in the Northern Galactic Cap of the 58-month Swift Burst Alert Telescope (Swift/BAT) c…

astro-ph.HE2012★ 54 cited

Chandra observations of SN 1987A: the soft X-ray light curve revisited

E. A. Helder, P. S. Broos, D. Dewey +6

We report on the present stage of SN 1987A as observed by the Chandra X-ray Observatory. We reanalyze published Chandra observations and add three more epochs of Chandra data to ge…

astro-ph.HE2012★ 4 cited

The Chandra Local Volume Survey: The X-ray Point Source Population of NGC 404

B. Binder, B. F. Williams, M. Eracleous +4

We present a comprehensive X-ray point source catalog of NGC 404 obtained as part of the Chandra Local Volume Survey. A new, 97 ks Chandra ACIS-S observation of NGC 404 was combine…

astro-ph.HE2012★ 99 cited

Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow

LAT Collaboration, GBM Collaboration, Swift Collaboration +2

We report on the multiwavelength observations of the bright, long gamma-ray burst \GRB, by the \Fermi and \Swift observatories, and by the MOA and GROND optical telescopes. The ana…

astro-ph.HE2012★ 43 cited

Luminous supernova-like UV/optical/infrared transients associated with ultra-long gamma-ray bursts from metal-poor blue supergiants

Kazumi Kashiyama, Daisuke Nakauchi, Yudai Suwa +2

Metal-poor massive stars may typically end up their lives as blue supergiants (BSGs). Gamma-ray bursts (GRBs) from such progenitors could have ultra-long duration of relativistic j…

astro-ph.HE2012★ 302 cited

Search for dark matter annihilations in the Sun with the 79-string IceCube detector

IceCube collaboration, M. G. Aartsen, R. Abbasi +274

We have performed a search for muon neutrinos from dark matter annihilation in the center of the Sun with the 79-string configuration of the IceCube neutrino telescope. For the fir…

astro-ph.HE2012★ 115 cited

The Astrophysical Multimessenger Observatory Network (AMON)

M. W. E. Smith, D. B. Fox, D. F. Cowen +18

We summarize the science opportunity, design elements, current and projected partner observatories, and anticipated science returns of the Astrophysical Multimessenger Observatory…

astro-ph.HE2012★ 77 cited

A Search for Point Sources of EeV Neutrons

The Pierre Auger Collaboration

A thorough search of the sky exposed at the Pierre Auger Cosmic Ray Observatory reveals no statistically significant excess of events in any small solid angle that would be indicat…

astro-ph.HE2012★ 102 cited

Rapid TeV Gamma-Ray Flaring of BL Lacertae

T. Arlen, T. Aune, M. Beilicke +83

We report on the detection of a very rapid TeV gamma-ray flare from BL Lacertae on 2011 June 28 with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The flar…

astro-ph.HE2012★ 47 cited

The helical jet of the Vela Pulsar

Martin Durant, Oleg Kargaltsev, George G. Pavlov +2

We have studied the fascinating dynamics of the nearby Vela pulsar's nebula in a campaign comprising eleven 40ks observations with Chandra X-ray Observatory (CXO). The deepest yet…

astro-ph.HE2012★ 69 cited

Black Hole-Neutron Star Mergers in Globular Clusters

Drew Clausen, Steinn Sigurdsson, David F. Chernoff

We model the formation of black hole-neutron star (BH-NS) binaries via dynamical interactions in globular clusters. We find that in dense, massive clusters, 16-61% of the BH-NS bin…

astro-ph.HE2012★ 39 cited

Search for Galactic PeV Gamma Rays with the IceCube Neutrino Observatory

IceCube collaboration, M. G. Aartsen, R. Abbasi +274

Gamma-ray induced air showers are notable for their lack of muons, compared to hadronic showers. Hence, air shower arrays with large underground muon detectors can select a sample…

astro-ph.HE2012★ 9 cited

VERITAS Observations of Six Bright, Hard-Spectrum Fermi-LAT Blazars

E. Aliu, S. Archambault, T. Arlen +84

We report on VERITAS very-high-energy (VHE; E>100 GeV) observations of six blazars selected from the Fermi Large Area Telescope First Source Catalog (1FGL). The gamma-ray emission…

astro-ph.HE2012★ 18 cited

XMM-Newton observation of the very old pulsar J0108-1431

B. Posselt, P. Arumugasamy, G. G. Pavlov +3

We report on an X-ray observation of the 166 Myr old radio pulsar J0108-1431 with XMM-Newton. The X-ray spectrum can be described by a power-law model with a relatively steep photo…

astro-ph.HE2012★ 17 cited

Search for a correlation between very-high-energy gamma rays and giant radio pulses in the Crab pulsar

E. Aliu, S. Archambault, T. Arlen +87

We present the results of a joint observational campaign between the Green Bank radio telescope and the VERITAS gamma-ray telescope, which searched for a correlation between the em…

astro-ph.HE2012★ 10 cited

A search for anisotropy in the arrival directions of ultra high energy cosmic rays recorded at the Pierre Auger Observatory

Pierre Auger Collaboration

Observations of cosmic ray arrival directions made with the Pierre Auger Observatory have previously provided evidence of anisotropy at the 99% CL using the correlation of ultra hi…

astro-ph.HE2012★ 76 cited

Search for Point-Like Sources of Ultra-High Energy Neutrinos at the Pierre Auger Observatory and Improved Limit on the Diffuse Flux of Tau Neutrinos

Pierre Auger Collaboration

The Surface Detector array of the Pierre Auger Observatory can detect neutrinos with energy between 10^17 eV and 10^20 eV from point-like sources across the sky south of +55 deg an…

astro-ph.HE2012★ 48 cited

High Energy Neutrinos from Dissipative Photospheric Models of Gamma Ray Bursts

Shan Gao, Katsuaki Asano, Peter Meszaros

We calculate the high energy neutrino spectrum from gamma-ray bursts where the emission arises in a dissipative jet photosphere determined by either baryonically or magnetically do…

astro-ph.HE2012★ 69 cited

A blurred reflection interpretation for the intermediate flux state in Mrk 335

L. C. Gallo, A. C. Fabian, D. Grupe +7

As part of a long term monitoring campaign of Mrk 335, deep XMM-Newton observations catch the narrow-line Seyfert 1 galaxy (NLS1) in a complex, intermediate flux interval as the ac…

astro-ph.HE2012★ 47 cited

High-energy neutrino and gamma-ray transients from trans-relativistic supernova shock breakouts

Kazumi Kashiyama, Kohta Murase, Shunsaku Horiuchi +2

Relativistic shocks that accompany supernovae (SNe) produce X-ray burst emissions as they break out in the dense circumstellar medium around the progenitors. This phenomenon is som…

astro-ph.HE2012★ 17 cited

Magnetically and Baryonically Dominated Photospheric Gamma-Ray Burst Model Fits to Fermi LAT Observations

Péter Veres, Bin-Bin Zhang, Péter Mészáros

We consider gamma-ray burst models where the radiation is dominated by a photospheric region providing the MeV Band spectrum, and an external shock region responsible for the GeV r…

astro-ph.HE2012★ 60 cited

The X-ray flaring properties of Sgr A* during six years of monitoring with Swift

N. Degenaar, J. M. Miller, J. Kennea +2

Starting in 2006, Swift has been targeting a region of ~21'X21' around Sagittarius A* (Sgr A*) with the onboard X-ray telescope. The short, quasi-daily observations offer an unique…