Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 387, Issue 1, Pages L36-L40Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2008.00478.x
Keywords
galaxies: individual: NGC 1313; X-rays: binaries
Categories
Funding
- ESA Member states
- USA (NASA)
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We report on the discovery and analysis of the transient X-ray pulsar XMMU J031747.5-663010 detected in the 2004 November 23 XMM-Newton observation of the spiral galaxy NGC 1313. The X-ray source exhibits pulsations with a period P similar to 735.6 s and a nearly sinusoidal pulse shape and pulsed fraction similar to 38 per cent in the 0.3-7 keV energy range. The X-ray spectrum of XMMU J031747.5-663010 is hard and well fitted with an absorbed simple power law of photon index Gamma similar to 1.5 in the 0.3-7 keV energy band. The X-ray properties of the source and the absence of an optical/ultraviolet counterpart brighter than 20 mag allow us to identify XMMU J031747.5-663010 as an accreting X-ray pulsar located in NGC 1313. The estimated absorbed 0.3-7 keV luminosity of the source L-X similar to 1.6 x 10(39) erg s(-1), makes it one of the bridghtes X-ray pulsars known. Based on the relatively long pulse period and transient behaviour of the source, we classify it as a Be binary X-ray pulsar candidate. XMMU J031747.5-663010 is the second X-ray pulsar detected outside the local group, after transient 18 s pulsating source CXOU J073709.1+653544 discovered in the nearby spiral galaxy NGC 2403.
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