output
19912026
Showing 2014 · astro-ph.HEShow all

60 papers · 2 filters

astro-ph.HE2014★ 22 cited

A Search for Pulsations from Geminga Above 100 GeV with VERITAS

E. Aliu, S. Archambault, A. Archer +81

We present the results of 71.6 hours of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS bet…

astro-ph.HE2014★ 30 cited

H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud

H. E. S. S. Collaboration, :, A. Abramowski +224

G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE) Ga…

astro-ph.HE2014★ 46 cited

Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

E. Aliu, S. Archambault, T. Arlen +92

We summarize broadband observations of the TeV-emitting blazar 1ES 1959+650, including optical R-band observations by the robotic telescopes Super-LOTIS and iTelescope, UV observat…

astro-ph.HE2014★ 29 cited

H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A

H. E. S. S. Collaboration, :, A. Abramowski +224

Puppis A is an interesting ~4 kyr-old supernova remnant (SNR) that shows strong evidence of interaction between the forward shock and a molecular cloud. It has been studied in deta…

astro-ph.HE2014★ 35 cited

A detailed study of the optical attenuation of gamma-ray bursts in the Swift era

O. M. Littlejohns, N. R. Butler, A. Cucchiara +16

We present optical and near-infrared (NIR) photometry of 28 gamma-ray bursts (GRBs) detected by the \textit{Swift} satellite and rapidly observed by the Reionization and Transients…

astro-ph.HE2014★ 133 cited

Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010

The MAGIC Collaboration, J. Aleksić, S. Ansoldi +251

A flare from the TeV blazar Mrk 421, occurring in March 2010, was observed for 13 consecutive days from radio to very high energy (VHE, E > 100 GeV) gamma-rays with MAGIC, VERITAS,…

astro-ph.HE2014★ 27 cited

Finding the First Cosmic Explosions. IV. 90 - 140 M Pair-Instability Supernovae

Joseph Smidt, Daniel J. Whalen, E. Chatzopoulos +4

Population III stars that die as pair-instability supernovae are usually thought to fall in the mass range of 140 - 260 M. But several lines of work have now shown that r…

astro-ph.HE2014★ 29 cited

VERITAS Observations of the BL Lac Object PG 1553+113

E. Aliu, A. Archer, T. Aune +84

We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560\,GeV…

astro-ph.HE2014★ 61 cited

Gamma-ray flaring activity from the gravitationally lensed blazar PKS 1830-211 observed by Fermi LAT

The Fermi LAT Collaboration, A. A. Abdo, M. Ackermann +126

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope routinely detects the highly dust-absorbed, reddened, and MeV-peaked flat spectrum radio quasar PKS 1830…

astro-ph.HE2014★ 81 cited

Where do the 3.5 keV photons come from? A morphological study of the Galactic Center and of Perseus

Eric Carlson, Tesla Jeltema, Stefano Profumo

We test the origin of the 3.5 keV line photons by analyzing the morphology of the emission at that energy from the Galactic Center and from the Perseus cluster of galaxies. We empl…

astro-ph.HE2014★ 109 cited

Zooming In on the Progenitors of Superluminous Supernovae With the HST

R. Lunnan, R. Chornock, E. Berger +25

We present Hubble Space Telescope (HST) rest-frame ultraviolet imaging of the host galaxies of 16 hydrogen-poor superluminous supernovae (SLSNe), including 11 events from the Pan-S…

astro-ph.HE2014★ 87 cited

A Luminous, Fast Rising UV-Transient Discovered by ROTSE: a Tidal Disruption Event?

J. Vinko, F. Yuan, R. M. Quimby +6

We present follow-up observations of an optical transient (OT) discovered by ROTSE on Jan. 21, 2009. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift…

astro-ph.HE2014★ 23 cited

A Radio and X-ray Study of the Merging Cluster A2319

Emma Storm, Tesla E. Jeltema, Lawrence Rudnick

A2319 is a massive, merging galaxy cluster with a previously detected radio halo that roughly follows the X-ray emitting gas. We present the results from recent observations of A23…

astro-ph.HE2014★ 55 cited

The most powerful flaring activity from the NLSy1 PMN J0948+0022

F. D'Ammando, M. Orienti, J. Finke +73

We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma rays, PMN J0948+0022 ( = 0.5846).…

astro-ph.HE2014★ 75 cited

Multiwavelength observations of Mrk 501 in 2008

MAGIC Collaboration, J. Aleksić, S. Ansoldi +256

Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal is to characterize in detail the source gam…

astro-ph.HE2014★ 33 cited

The high-energy -ray emission of AP Librae

H. E. S. S. Collaboration, Fermi-LAT collaborations

The -ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; ) -ray emission up…

astro-ph.HE2014★ 37 cited

Constraints on Very High Energy Emission from GRB 130427A

E. Aliu, T. Aune, A. Barnacka +89

Prompt emission from the very fluent and nearby (z=0.34) gamma-ray burst GRB 130427A was detected by several orbiting telescopes and by ground-based, wide-field-of-view optical tra…

astro-ph.HE2014★ 112 cited

Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies

H. E. S. S. Collaboration, :, A. Abramowski +229

Dwarf spheroidal galaxies of the Local Group are close satellites of the Milky Way characterized by a large mass-to-light ratio and are not expected to be the site of non-thermal h…

astro-ph.HE2014★ 147 cited

The Initiation and Propagation of Helium Detonations in White Dwarf Envelopes

Ken J. Shen, Kevin Moore

Detonations in helium-rich envelopes surrounding white dwarfs have garnered attention as triggers of faint thermonuclear ".Ia" supernovae and double detonation Type Ia supernovae.…

astro-ph.HE2014★ 823 cited

The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV

The Fermi LAT collaboration, M. Ackermann, M. Ajello +142

The γ-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, and a res…

astro-ph.HE2014★ 18 cited

Cosmic-Ray Models of the Ridge-Like Excess of Gamma Rays in the Galactic Center

Oscar Macias, Chris Gordon, Roland Crocker +1

The High-Energy Stereoscopic System (HESS) has detected diffuse TeV emission correlated with the distribution of molecular gas along the Ridge at the Galactic Center. Diffuse, non-…

astro-ph.HE2014★ 41 cited

Search for gamma-rays from the unusually bright GRB 130427A with the HAWC Gamma-ray Observatory

The HAWC collaboration, A. U. Abeysekara, R. Alfaro +90

The first limits on the prompt emission from the long gamma-ray burst (GRB) 130427A in the energy band are reported. GRB 130427A was the most powerful b…

astro-ph.HE2014★ 20 cited

Improving the Sensitivity of Gamma-Ray Telescopes to Dark Matter Annihilation in Dwarf Spheroidal Galaxies

Eric Carlson, Dan Hooper, Tim Linden

The Fermi-LAT collaboration has studied the gamma-ray emission from a stacked population of dwarf spheroidal galaxies and used this information to set constraints on the dark matte…

astro-ph.HE2014★ 31 cited

Long-term monitoring of PKS 2155304 with ATOM and H.E.S.S.: investigation of optical/-ray correlations in different spectral states

A. Abramowski, F. Aharonian, F. Ait Benkhali +225

In this paper we report on the analysis of all the available optical and very high-energy -ray (200 GeV) data for the BL Lac object PKS 2155304, collected simultaneously w…