ON THE IMPLICATIONS OF LATE INTERNAL DISSIPATION FOR SHALLOW-DECAY AFTERGLOW EMISSION AND ASSOCIATED HIGH-ENERGY GAMMA-RAY SIGNALS

被引：42

作者：

Murase, Kohta ^{[1
,2
]}

Toma, Kenji ^{[3
,4
]}

Yamazaki, Ryo ^{[5
]}

Meszaros, Peter ^{[3
,4
]}

机构：

[1] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, Columbus, OH 43210 USA

[2] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528550, Japan

[3] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[4] Penn State Univ, Ctr Particle Astrophys, University Pk, PA 16802 USA

[5] Aoyama Gakuin Univ, Dept Math & Phys, Sagamihara, Kanagawa 2525258, Japan

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 732卷 / 02期

基金：

美国国家科学基金会;

关键词：

gamma-ray burst: general; radiation mechanisms: non-thermal; SWIFT XRT DATA; BURST AFTERGLOWS; LIGHT CURVES; PROMPT EMISSION; GRB; 090902B; COMPREHENSIVE ANALYSIS; SYNCHROTRON-RADIATION; COMPTON-SCATTERING; FERMI OBSERVATIONS; OPTICAL-EMISSION;

D O I：

10.1088/0004-637X/732/2/77

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The origin of the shallow-decay emission during early X-ray afterglows has been an open issue since the launch of the Swift satellite. One of the appealing models is the late internal dissipation model, where X-ray emission during the shallow-decay phase is attributed to internal dissipation, analogous to the prompt gamma-ray emission. We discuss possible scenarios of the late prompt emission, such as late internal shocks, magnetic reconnection, and photospheric dissipation. We also consider the consequences of late dissipation and a two-component (early and late) jet model for the high-energy (GeV-TeV) emission. We study not only synchrotron self-Compton (SSC) emission from the early and late jets but also external inverse-Compton (EIC) emission, which is naturally predicted in the late dissipation model. For the latter, we perform numerical calculations taking into account the equal-arrival-time surface of EIC photons and show that the EIC component typically has a peak at similar to 1-100 GeV which may dominate over the SSC components. We demonstrate that very high energy gamma rays from both these components are detectable for nearby and/or energetic gamma-ray bursts, with current and future Cherenkov detectors such as MAGIC, VERITAS, CTA, and HAWC, and possibly Fermi. Although the expected event rate would not be large, detections should be useful as a test of the model. Multi-wavelength observations using both the ground-based telescopes and the Swift and/or Fermi satellites are also important to constrain the models.

引用

页数：16

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