LONG-TERM MONITORING OF THE HIGH-ENERGY γ-RAY EMISSION FROM LS I+61°303 AND LS 5039

被引：64
作者：
Hadasch, D. [1 ]
Torres, D. F. [1 ,2 ]
Tanaka, T. [3 ,4 ]
Corbet, R. H. D. [5 ,6 ]
Hill, A. B. [3 ,4 ,7 ]
Dubois, R. [3 ,4 ]
Dubus, G. [8 ]
Glanzman, T. [3 ,4 ]
Corbel, S. [9 ,10 ]
Li, J. [11 ]
Chen, Y. P. [11 ]
Zhang, S. [11 ]
Caliandro, G. A. [1 ]
Kerr, M. [3 ,4 ]
Richards, J. L. [12 ]
Max-Moerbeck, W. [12 ]
Readhead, A. [12 ]
Pooley, G. [13 ]
机构：
[1] Inst Ciencies Espai IEEC CSIC, Barcelona 08193, Spain
[2] ICREA, Barcelona 08010, Spain
[3] Stanford Univ, WW Hansen Expt Phys Lab Kavli Inst Particle Astro, Dept Phys, Stanford, CA 94305 USA
[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[6] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA
[7] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England
[8] CNRS INSU, UJF Grenoble 1, Inst Planetol & Astrophys Grenoble, F-38041 Grenoble, France
[9] Univ Paris 07, F-91191 Gif Sur Yvette, France
[10] CEA Saclay, Serv Astrophys, UMR AIM, F-91191 Gif Sur Yvette, France
[11] Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China
[12] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA
[13] Cavendish Lab, Cambridge CB3 0HE, England
来源：
ASTROPHYSICAL JOURNAL | 2012年 / 749卷 / 01期
基金：
中国国家自然科学基金; 美国国家科学基金会; 美国国家航空航天局; 瑞典研究理事会;
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); LARGE-AREA TELESCOPE; DEEP CHANDRA OBSERVATIONS; PSR B1259-63/LS 2883; ORBITAL MODULATION; TEV BINARY; I+61 303; VERITAS OBSERVATIONS; RADIO OBSERVATIONS; I +61-DEGREES-303; TIME-SERIES;
D O I：
10.1088/0004-637X/749/1/54
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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.
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页数：12
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