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XMMU J134736.6+173403: An eclipsing LMXB in quiescence or a peculiar AGN?

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journal contribution
posted on 24.10.2012, 09:22 by S. Carpano, A. Nucita, B. Altieri, A. R. King, P. Leisy
Aims.We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart. Methods.The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed. Results.The X-ray flux decreases by a factor of 6.5 within 1 h and stays in a low state for at least 10 h, thereby suggesting the presence of an eclipse. The spectrum is very soft, a power law with a slope of $\Gamma\sim2.8$, and does not change significantly before and after the flux drop. The source is spatially coincident within few arc-seconds with a Seyfert 2 galaxy belonging to a galaxy pair. Conclusions.Although the background AGN seems the best counterpart, neither the temporal nor the spectral properties of the X-ray source are compatible with it. We investigate the possibility of having a foreground low-mass X-ray binary in quiescence, where the companion is not detected in the optical wavelength.

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Citation

Astronomy & Astrophysics, 2008, 480 (3), pp. 807-810

Version

VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

eissn

1432-0746

Copyright date

2008

Available date

24/10/2012

Publisher version

http://www.aanda.org/articles/aa/abs/2008/12/aa9027-07/aa9027-07.html

Language

en

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