Broadband observations of the new X-ray burster sax J1747.0-2853 during the 1998 March outburst

被引:18
作者
Natalucci, L
Bazzano, A
Cocchi, M
Ubertini, P
Heise, J
Kuulkers, E
Zand, JJMI
机构
[1] CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy
[2] Space Res Org Netherlands, NL-3584 CA Utrecht, Netherlands
[3] Univ Utrecht, Astron Inst, NL-3507 TA Utrecht, Netherlands
关键词
binaries : close; stars : individual (SAX J1747.0-2853); X-rays : bursts;
D O I
10.1086/318173
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on our discovery and follow-up observations of the X-ray source SAX J1747.0-2853 detected in outburst on 1998 March 10 with the BeppoSAX Wide-Field Cameras in the energy range 2-28 keV. The source is located about 0.degrees5 off the Galactic nucleus. A total of 14 type I X-ray bursts were detected in spring of 1998, thus identifying the object as a likely low-mass X-ray binary harboring a weakly magnetized neutron star. Evidence for photospheric radius expansion is present in at least one of the observed bursts, leading to an estimate of the source distance of similar to9 kpc. We performed a follow-up target of opportunity observation with the BeppoSAX narrow-field instruments an March 23 for a total elapsed time of 7.2 x 10(4). The source persistent luminosity was 2.6 x 10(36) ergs s(-2) in the 2-10 keV energy range. The broadband spectral data (1-200 keV) are consistent with a remarkable hard X-ray spectrum detected up to similar to 150 keV, highly absorbed at low energies (N-H similar or equal to 10(23) cm(-2)) and with clear evidence for an absorption edge at similar to7 keV. A soft thermal component is also observed, which can be described by single-temperature blackbody emission at similar to0.6 keV.
引用
收藏
页码:L73 / L76
页数:4
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