1E 1740.7-2942: Temporal and spectral evolution from INTEGRAL and RXTE observations

被引：27

作者：

Del Santo, M

Bazzano, A

Zdziarski, AA

Smith, DM

Bezayiff, N

Farinelli, R

De Cesare, G

Ubertini, P

Bird, AJ

Bel, MC

Capitanio, F

Goldwurm, A

Malizia, A

Mirabel, IF

Natalucci, L

Winkler, C

机构：

[1] CNR, Ist Astrofis Spaziale & Fis Cosmica, I-00133 Rome, Italy

[2] Nicholas Copernicus Astron Ctr, PL-00716 Warsaw, Poland

[3] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA

[4] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[5] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[6] CNR, IASF, Sez Bologna, I-40129 Bologna, Italy

[7] CEA Saclay, DSM DAPNIA SAp, CNRS, FRE 2591, F-91191 Gif Sur Yvette, France

[8] ESTEC, Res & Sci Support Dept ESA, NL-2200 AG Noordwijk, Netherlands

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 433卷 / 02期

关键词：

gamma rays : observations; radiation mechanisms : non-thermal; stars : individual : 1E 1740.7-2942; X-rays : binaries; black hole physics;

D O I：

10.1051/0004-6361:20042058

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results of the monitoring of the black hole candidate 1E 1740.7-2942 with INTEGRAL, in combination with simultaneous observations by RXTE. We concentrate on broad-band spectra from INTEGRAL/IBIS and RXTE/PCA instruments. During our observations, the source spent most of its time in the canonical low/hard state with the measured flux variation within a factor of two. In 2003 September the flux started to decline and in 2004 February it was below the sensitivity level of the INTEGRAL and RXTE instruments. Notably, during the decline phase the spectrum changed, becoming soft and typical of black-hole binaries in the intermediate/soft state.

引用

页码：613 / 617

页数：5

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