Two long-period X-ray pulsars detected in the SMC field around

Free access article

Issue		A&A Volume 420, Number 3, June IV 2004


Page(s)		L19 - L22
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20040156

A&A 420, L19-L22 (2004)
DOI: 10.1051/0004-6361:20040156

Letter

Two long-period X-ray pulsars detected in the SMC field around

F. Haberl¹, W. Pietsch¹, N. Schartel², P. Rodriguez² and R. H. D. Corbet^{3, 4}

¹ Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany
² XMM-Newton Science Operations Centre, ESA, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain
³ Laboratory for High Energy Astrophysics, Code 662, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
⁴ Universities Space Research Association

(Received 17 February 2004 / Accepted 30 April 2004)

Abstract
An XMM-Newton target of opportunity observation of the field around the transient 18.37 s pulsar in the Small Magellanic Cloud (SMC) revealed two bright, long-period X-ray pulsars in the EPIC data. A new pulsar, , with a pulse period of $701.7 \pm 0.8$ s was discovered and $500.0 \pm 0.2$ s pulsations were detected from (=CXOU J005455.6-724510), confirming the period found in Chandra data. We derive X-ray positions of ${\rm RA} = 00^{\rm h}54^{\rm m}55\fs88$ , ${\rm Dec} = -72\degr45\arcmin10\farcs5$ and ${\rm RA} = 00^{\rm h}55^{\rm m}18\fs44$ , ${\rm Dec} = -72\degr38\arcmin51\farcs8$ (J2000.0) with an uncertainty of 0 $\farcs$ 2 utilizing optical identification with OGLE stars. For both objects, the optical brightness and colours and the X-ray spectra are consistent with Be/X-ray binary systems in the SMC.

Key words: galaxies: individual: Small Magellanic Cloud -- stars: neutron -- X-rays: binaries -- X-rays: galaxies

Offprint request: F. Haberl, fwh@mpe.mpg.de

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