IGR J16393-4643: a new heavily-obscured X-ray pulsar

被引：49

作者：

Bodaghee, A

Walter, R

Heras, JAZ

Bird, AJ

Courvoisier, TJL

Malizia, A

Terrier, R

Ubertini, P

机构：

[1] INTEGRAL Sci Data Ctr, CH-1290 Versoix, Switzerland

[2] Observ Geneva, CH-1290 Sauverny, Switzerland

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

[4] CNR, IASF, I-40129 Bologna, Italy

[5] CEA Saclay, DAPNIA, Serv Astrophys, F-91191 Gif Sur Yvette, France

[6] Coll France, Federat Rech APC, F-75231 Paris, France

[7] CNR, IASF, I-00133 Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2006年 / 447卷 / 03期

关键词：

gamma-rays : observations; X-rays : binaries; pulsars : individuals : IGR J16393-4643; pulsars : individuals : AX J1639.0-4642;

D O I：

10.1051/0004-6361:20053809

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An analysis of the high-energy emission from IGR J16393-4643 (=AXJ1639.0-4642) is presented using data from INTEGRAL and XMM-Newton. The source is persistent in the 20-40 keV band at an average flux of 5.1 x 10(-11) erg cm(-2) s(-1), with variations in intensity by at least an order of magnitude. A pulse period of 912.0 +/- 0.1 s was discovered in the ISGRI and EPIC light curves. The source spectrum is a strongly-absorbed (N-H = (2.5 +/- 0.2) x 10(23) cm(-2)) power law that features a high-energy cutoff above 10 keV. Two iron emission lines at 6.4 and 7.1 keV, an iron absorption edge greater than or similar to 7.1 keV, and a soft excess emission of 7 x 10(-15) erg cm(-2) s(-1) between 0.5-2 keV, are detected in the EPIC spectrum. The shape of the spectrum does not change with the pulse. Its persistence, pulsation, and spectrum place IGR J16393-4643 among the class of heavily-absorbed HMXBs. The improved position from EPIC is RA (J2000) = 16(h)39(m)05.4(s) and Dec = -46 degrees 42'12 '' (4 '' uncertainty) which is compatible with that of 2MASS J16390535-4642137.

引用

页码：1027 / 1034

页数：8

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