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LONG-TERM MONITORING OF THE HIGH-ENERGY gamma-RAY EMISSION FROM LS I+61 degrees 303 AND LS 5039
Hadasch, D; Torres, DF; Tanaka, T; Corbet, RHD; Hill, AB; Dubois, R; Dubus, G; Glanzman, T; Corbel, S; Li, J; Chen, YP; Zhang, S; Caliandro, GA; Kerr, M; Richards, JL; Max-Moerbeck, W; Readhead, A; Pooley, G; Li J(李剑); Chen YP(陈玉鹏); Zhang S(张澍)
2012
发表期刊ASTROPHYSICAL JOURNAL
卷号749期号:1页码:54
摘要The Fermi Large Area Telescope (LAT) reported the first definitive GeV detections of the binaries LS I + 61 degrees 303 and LS 5039 in the first year after its launch in 2008 June. These detections were unambiguous as a consequence of the reduced positional uncertainty and the detection of modulated gamma-ray emission on the corresponding orbital periods. An analysis of new data from the LAT, comprising 30 months of observations, identifies a change in the gamma-ray behavior of LS I + 61 degrees 303. An increase in flux is detected in 2009 March and a steady decline in the orbital flux modulation is observed. Significant emission up to 30 GeV is detected by the LAT; prior data sets led to upper limits only. Contemporaneous TeV observations no longer detected the source, or found it-in one orbit-close to periastron, far from the phases at which the source previously appeared at TeV energies. The detailed numerical simulations and models that exist within the literature do not predict or explain many of these features now observed at GeV and TeV energies. New ideas and models are needed to fully explain and understand this behavior. A detailed phase-resolved analysis of the spectral characterization of LS I + 61 degrees 303 in the GeV regime ascribes a power law with an exponential cutoff spectrum along each analyzed portion of the system's orbit. The on-source exposure of LS 5039 is also substantially increased with respect to our prior publication. In this case, whereas the general gamma-ray properties remain consistent, the increased statistics of the current data set allows for a deeper investigation of its orbital and spectral evolution.
关键词binaries: close gamma rays: general stars: variables: general X-rays: binaries X-rays: individual (LS I+61 303) X-rays: individual (LS 5039)
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/749/1/54
收录类别SCI
WOS记录号WOS:000302175500054
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224402
专题粒子天体物理中心
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Hadasch, D,Torres, DF,Tanaka, T,et al. LONG-TERM MONITORING OF THE HIGH-ENERGY gamma-RAY EMISSION FROM LS I+61 degrees 303 AND LS 5039[J]. ASTROPHYSICAL JOURNAL,2012,749(1):54.
APA Hadasch, D.,Torres, DF.,Tanaka, T.,Corbet, RHD.,Hill, AB.,...&张澍.(2012).LONG-TERM MONITORING OF THE HIGH-ENERGY gamma-RAY EMISSION FROM LS I+61 degrees 303 AND LS 5039.ASTROPHYSICAL JOURNAL,749(1),54.
MLA Hadasch, D,et al."LONG-TERM MONITORING OF THE HIGH-ENERGY gamma-RAY EMISSION FROM LS I+61 degrees 303 AND LS 5039".ASTROPHYSICAL JOURNAL 749.1(2012):54.
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