MS 0317.7-6647 ONS candidate

MS 0317.7-6647 ONS candidate



This is a soft weak source discovered in the filed of the near galaxy NGC 1313. The only possible optical counterpart has mV=20.8, which implies fX/fV >60. The simultaneous lack of radio emission seems to role out the possibility of an extreme BL Lac object. The identification of this source with an X-ray object in NGC 1313 would lead to a luminosity of L=1040 erg s-1. The PSPC spectrum (0.03 c s-1) is well fitted by a blackbody with T ~ 0.2 keV, providing a luminosity of 1.7 1030 erg s-1 at 100 pc, where an infrared cirrus is also located.
(Adapted from Treves et al. 1996, Lipari proceedings).


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Stocke J.T., Wang Q.D., Perlman E.S., Donahue M.E. & Schacter J.F., Discovery of a candidate old, isolated neutron star in the field of a galactic cirrus cloud, 1995, AJ 109 1199


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Edited by SC 12/12/1996 (here is a disclaimer).