Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1328l&link_type=abstract
American Astronomical Society, HEAD meeting #12, #13.28
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed the first sensitive X-ray observation of the low-mass X-ray binary (LMXB) SAX J1750.8-2900 in quiescence with XMM-Newton. Both a classical black body model and a non-magnetized, pure hydrogen neutron star (NS) atmosphere model were fit to the 0.3-12.0 keV spectrum. In addition, a power law component was added to the model in order to search for evidence of harder emission not accounted for by the thermal component. Assuming a previously measured upper limit on the distance to SAX J1750.8-2900 of 6.3 +/- 0.7 kpc, we find that the upper limit for the luminosity of this source is 8.1 (+1.9) (-1.8) E33 erg/s for the NS atmosphere model, and 2.3 (+0.9) (-0.5) E33 erg/s for the black body model. We conclude that the power law contribution to the total luminosity is low, and we discuss implications for the origin of the power-law that is present in some systems. Although many quiescent NS transients show evidence for enhanced cooling, the quiescent luminosity for SAX J1750.8-2900 may be high enough that the standard cooling scenario may be sufficient.
Bodaghee Arash
Boggs Sam
Chaty Sylvain
Heinke Craig
Kaaret Phil
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