output
19932026
Showing 2011 · astro-ph.HEShow all

31 papers · 2 filters

astro-ph.HE2011★ 20 cited

The Abundance of New Kind of Dark Matter Structures

Yupeng Yang, Xuelei Chen, Tan Lu +1

A new kind of dark matter structures, ultracompact minihalos (UCMHs) was proposed recently. They would be formed during the radiation dominated epoch if the large density perturbat…

astro-ph.HE2011★ 10 cited

Where do the Progenitors of Millisecond Pulsars come from?

Ali Taani, Chengmin Zhang, Mashhoor Al-Wardat +1

Observations of a large population of Millisecond Pulsars (MSPs) show a wide divergence in the orbital periods (from approximately hours to a few months). In the standard view, Low…

astro-ph.HE2011★ 36 cited

Unveiling the super-orbital modulation of LS I +61 303 in X-rays

Jian Li, Diego F. Torres, Shu Zhang +5

From the longest monitoring of LS I +61 303 done to date by the Rossi X-ray Timing Explorer (RXTE) we found evidence for the long-sought, years- long modulation in the X-ray emissi…

astro-ph.HE2011★ 135 cited

The Highly Energetic Expansion of SN2010bh Associated with GRB 100316D

Filomena Bufano, Elena Pian, Jesper Sollerman +50

We present the spectroscopic and photometric evolution of the nearby (z = 0.059) spectroscopically confirmed type Ic supernova, SN 2010bh, associated with the soft, long-duration g…

astro-ph.HE2011

Could bright gamma-ray burst optical transients have been recorded historically?

Richard G. Strom, Fuyuan Zhao, Chengmin Zhang

The brightest optical flash from a gamma-ray burst (GRB) was, briefly, a naked-eye object. Several other GRBs have produced optical transients only slightly fainter. We argue that,…

astro-ph.HE2011★ 17 cited

Dynamical mass constraints on the ultraluminous X-ray Source NGC 1313 X-2

Jifeng Liu, Jerome Orosz, Joel N. Bregman

Dynamical mass measurements hold the key to answering whether ultraluminous X-ray sources (ULXs) are intermediate mass black holes (IMBHs) or stellar mass black holes with special…

astro-ph.HE2011★ 22 cited

On the Nature of the Progenitor of the Type Ia SN2011fe in M101

Jifeng Liu, Rosanne Di Stefano, Tao Wang +1

The explosion of a Type Ia supernova, SN 2011ef, in the nearby Pinwheel galaxy (M101 at 6.4 Mpc) provides an opportunity to study pre-explosion images and search for the progenitor…

astro-ph.HE2011★ 63 cited

Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope

Xiaofeng Wang, Lifan Wang, Alexei V. Filippenko +93

We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Sur…

astro-ph.HE2011★ 42 cited

Selection Effects on the Observed Redshift Dependence of GRB Jet Opening Angles

Rui-Jing Lu, Jun-Jie Wei, Shu-Fu Qin +1

Apparent redshift dependence of the jet opening angles () of gamma-ray bursts (GRBs) is observed from current GRB sample. We investigate whether this dependence can be e…

astro-ph.HE2011★ 38 cited

The Emission from Inner Disk and Corona in the Low and Intermediate Spectral States of Black Hole X-ray Binaries

Erlin Qiao, B. F. Liu

Recent observations reveal that a cool disk may survive in the innermost stable circular orbit (ISCO) for some black hole X-ray binaries in the canonical low/hard state. The spectr…

astro-ph.HE2011★ 45 cited

Burst and Persistent Emission Properties during the Recent Active Episode of the Anomalous X-ray Pulsar 1E 1841-045

Lin Lin, Chryssa Kouveliotou, Ersin Gogus +19

Swift/BAT detected the first burst from 1E 1841-045 in May 2010 with intermittent burst activity recorded through at least July 2011. Here we present Swift and Fermi/GBM observatio…

astro-ph.HE2011★ 114 cited

Antiprotons from dark matter annihilation in the Galaxy: astrophysical uncertainties

Carmelo Evoli, Ilias Cholis, Dario Grasso +2

The latest years have seen steady progresses in WIMP dark matter (DM) searches, with hints of possible signals suggested by both direct and indirect detection experiments. Antiprot…

astro-ph.HE2011★ 151 cited

Radiation Mechanisms and Physical Properties of GeV-TeV BL Lac Objects

Jin Zhang, En-Wei Liang, Shuang-Nan Zhang +1

BL Lac objects are the best candidates to study the jet properties since their spectral energy distributions (SEDs) are less contaminated by the emission from the accretion disk an…

astro-ph.HE2011★ 19 cited

A Systematic Study on Energy Dependence of Quasi-Periodic Oscillation Frequency in GRS 1915+105

Shu-Ping Yan, Jin-Lu Qu, Guo-Qiang Ding +6

Systematically studying all the RXTE/PCA observations for GRS 1915+105 before November 2010, we have discovered three additional patterns in the relation between Quasi-Periodic Osc…

astro-ph.HE2011★ 1 cited

Radiation Mechanisms and Physical Properties of GeV-TeV BL Lac Objects

Jin Zhang, En-Wei Liang, Shuang-Nan Zhang +1

Broadband spectral energy distributions (SEDs) are complied from literature for 24 TeV BL Lac objects. Two SEDs, which are identified as low and high states with their flux densiti…

astro-ph.HE2011★ 56 cited

Fermi/GBM Observations of SGR J0501+4516 Bursts

Lin Lin, Chryssa Kouveliotou, Matthew G. Baring +27

We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope during the 13…

astro-ph.HE2011★ 14 cited

Magnetic Energy Buildup for Relativistic Magnetar Giant Flares

Cong Yu

Motivated by coronal mass ejection studies, we construct general relativistic models of a magnetar magnetosphere endowed with strong magnetic fields. The equilibrium states of the…

astro-ph.HE2011★ 21 cited

Diffuse Galactic Gamma Rays at intermediate and high latitudes. I. Constraints on the ISM properties

I. Cholis, M. Tavakoli, C. Evoli +2

We study the high latitude (|b|>10) diffuse gamma-ray emission in the Galaxy in light of the recently published data from the Fermi collaboration at energies between 100 MeV and 10…

astro-ph.HE2011★ 11 cited

A unique X-ray unabsorbed Seyfert 2 galaxy IRAS F01475-0740

Xing-Xing Huang, Jun-Xian Wang, Ying Tan +2

X-ray unabsorbed Seyfert 2 galaxies appear to have X-ray absorption column densities that are too low (NH < 10^22 cm-2) to explain the absence of broad emission lines in their opti…

astro-ph.HE2011

N(HI) and jet power/emission in AGNs

Zhongzu Wu, Minfeng Gu, Ming Zhu

Neutral hydrogen (HI) 21 cm absorption has been detected against more and more powerful radio jets. In this work, based on the Guppta et al. 2006a sample, we present our preliminar…

astro-ph.HE2011★ 8 cited

On the external photon fields in Fermi bright blazars

Xiao-Yan Gao, Jian-Cheng Wang, Ming Zhou

The external Compton (EC) model is used to study the high energy emission of some blazars, in which the external photon field is considered to dominate inverse Compton radiation. W…

astro-ph.HE2011★ 8 cited

Possible Distance Indicators in Gamma-ray Pulsars

W. Wang

Distance measurements of gamma-ray pulsars are challenging questions in present pulsar studies. The Large Area Telescope (LAT) aboard the Fermi gamma-ray observatory discovered mor…

astro-ph.HE2011★ 81 cited

The Chinese-French SVOM mission for GRBs studies

Jacques Paul, Jianyan Wei, Stephane Basa +1

We present the SVOM (Space-based multi-band astronomical Variable Objects Monitor) mission that the Chinese National Space Agency and the French Space Agency have decided to jointl…

astro-ph.HE2011★ 14 cited

The Diagnostics and Possible Evolution in Active Galactic Nuclei Associated With Starburst Galaxies

Yu-Zhong Wu, Yong-Heng Zhao, Xian-Min Meng

We present a large sample which contains 45 Seyfert 1 galaxies (Sy1s), 46 hidden broad-line region (HBLR) Seyfert 2 galaxies (Sy2s), 57 non-HBLR Sy2s, and 22 starburst galaxies to…