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Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS
Lin, Lin1,2; Kouveliotou, Chryssa3; Baring, Matthew G.4; van der Horst, Alexander J.5; Guiriec, Sylvain2; Woods, Peter M.6; Gogus, Ersin7; Kaneko, Yuki7; Scargle, Jeffrey8; Granot, Jonathan9; Preece, Robert2; von Kienlin, Andreas10; Chaplin, Vandiver2; Watts, Anna L.11; Wijers, Ralph A. M. J.11; Zhang, Shuang Nan1,12; Bhat, Narayan2; Finger, Mark H.5; Gehrels, Neil13; Harding, Alice13; Kaper, Lex11; Kaspi, Victoria14; Mcenery, Julie13; Meegan, Charles A.5; Paciesas, William S.2; Pe'er, Asaf15; Ramirez-Ruiz, Enrico16; van der Klis, Michiel11; Wachter, Stefanie17; Wilson-Hodge, Colleen3
2011-10-01
发表期刊ASTROPHYSICAL JOURNAL
卷号739期号:2
摘要We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the gamma-ray burst monitor on board the Fermi Gamma-ray Space Telescope during 13 days of the source's activation in 2008 (August 22-September 3). We find that the T-90 durations of the bursts can be fit with a log-normal distribution with a mean value of similar to 123 ms. We also estimate for the first time event durations of soft gamma repeater (SGR) bursts in photon space (i.e., using their deconvolved spectra) and find that these are very similar to the T-90 values estimated in count space (following a log-normal distribution with a mean value of similar to 124 ms). We fit the time-integrated spectra for each burst and the time-resolved spectra of the five brightest bursts with several models. We find that a single power law with an exponential cutoff model fits all 29 bursts well, while 18 of the events can also be fit with two blackbody functions. We expand on the physical interpretation of these two models and we compare their parameters and discuss their evolution. We show that the time-integrated and time-resolved spectra reveal that E-peak decreases with energy flux (and fluence) to a minimum of similar to 30 keV at F = 8.7 x 10(-6) erg cm(-2) s(-1), increasing steadily afterward. Two more sources exhibit a similar trend: SGRs J1550-5418 and 1806-20. The isotropic luminosity, L-iso, corresponding to these flux values is roughly similar for all sources (0.4-1.5 x 10(40) erg s(-1)).
关键词Pulsars: Individual (Sgr j0501+4516) X-rays: Bursts
DOI10.1088/0004-637X/739/2/87
收录类别SCI
语种英语
WOS记录号WOS:000294969800032
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8383
专题空间科学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Alabama, CSPAR, Huntsville, AL 35805 USA
3.NASA, Space Sci Off, Marshall Space Flight Ctr, Huntsville, AL 35812 USA
4.Rice Univ, Dept Phys & Astron, Houston, TX 77251 USA
5.Univ Space Res Assoc, NSSTC, Huntsville, AL 35805 USA
6.Corvid Technol, Huntsville, AL 35806 USA
7.Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey
8.NASA, Ames Res Ctr, Space Sci & Astrobiol Div, Moffett Field, CA 94035 USA
9.Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England
10.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
11.Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1090 GE Amsterdam, Netherlands
12.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
13.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
14.McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
15.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
16.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
17.CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
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Lin, Lin,Kouveliotou, Chryssa,Baring, Matthew G.,et al. Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS[J]. ASTROPHYSICAL JOURNAL,2011,739(2).
APA Lin, Lin.,Kouveliotou, Chryssa.,Baring, Matthew G..,van der Horst, Alexander J..,Guiriec, Sylvain.,...&Wilson-Hodge, Colleen.(2011).Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS.ASTROPHYSICAL JOURNAL,739(2).
MLA Lin, Lin,et al."Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS".ASTROPHYSICAL JOURNAL 739.2(2011).
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