Volume 450, Number 2, May I 2006
|Page(s)||759 - 762|
|Section||Stellar structure and evolution|
|Published online||10 April 2006|
XMM-Newton observations of the Soft Gamma Ray Repeater SGR 1627-41 in a low luminosity state
INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via Bassini 15, 20133 Milano, Italy e-mail: firstname.lastname@example.org
2 Università degli Studi di Milano, Dipartimento di Fisica, via Celoria 16, 20133 Milano, Italy
3 Università di Padova, Dipartimento di Fisica, via Marzolo 8, 35131 Padova, Italy
4 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking Surrey, RH5 6NT, UK
5 INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone, Roma, Italy
6 INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Roma, via Fosso del Cavaliere 100, 00133 Roma, Italy
7 Università degli Studi dell'Insubria, via Valleggio 11, 22100 Como, Italy
Accepted: 11 January 2006
The sky region containing the soft gamma-ray repeater SGR 1627-41 has been observed three times with XMM-Newton in February and September 2004. SGR 1627-41 has been detected with an absorbed flux of ~ erg cm-2 s-1 (2-10 keV). For a distance of 11 kpc, this corresponds to a luminosity of ~ erg s-1, the smallest ever observed for a Soft Gamma Repeater and possibly related to the long period of inactivity of this source. The observed flux is smaller than that seen with Chandra in 2001-2003, suggesting that the source was still fading and had not yet reached a steady quiescent level. The spectrum is equally well fit by a steep power law (photon index ~3.2) or by a blackbody with temperature keV. We also report on the INTEGRAL transient IGR J16358-4726 that lies at ~10' from SGR 1627-41. It was detected only in September 2004 with a luminosity of ~ erg s-1 (for kpc), while in February 2004 it was at least a factor 10 fainter.
Key words: stars: individual: SGR 1627-41 / X-rays: individuals: IGR J16358-4726 / stars: neutron
© ESO, 2006
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