INTEGRAL and Swift observations of the hard X-ray transient MAXI J1828-249

被引:5
作者
Filippova, E. [1 ,2 ]
Bozzo, E. [1 ]
Ferrigno, C. [1 ]
机构
[1] Univ Geneva, ISDC, CH-1290 Versoix, Switzerland
[2] Space Res Inst, Moscow 117997, Russia
基金
瑞士国家科学基金会;
关键词
X-rays: binaries; X-rays: bursts; accretion; accretion disks; black hole physics; STATES; IMAGER;
D O I
10.1051/0004-6361/201323337
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we report on the observations performed with INTEGRAL and Swift of the first outburst detected from the hard X-ray transient MAXI J1828-249. During the first about two days of the outburst, the source was observed by MAXI to undergo a very rapid transition from a hard to a softer spectral state. While the hard state was not efficiently monitored because the transition occurred so rapidly, the evolution of the source outburst in the softer state was covered quasi-simultaneously in a broad energy range (0.6-150 keV) by the instruments on board INTEGRAL and Swift. During these observations, the spectra measured from the source displayed both a prominent thermal emission with temperature kT similar to 0.7 keV and a power-law hard component with a photon index Gamma similar to 2.2 extending to 200 keV. The properties of the source in the X-ray domain are reminiscent of those displayed by black hole transients during the soft intermediate state, which supports the association of MAXI J1828-249 with this class of objects.
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页数:5
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