Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..128..349d&link_type=abstract
Astronomy and Astrophysics Supplement, v.128, p.349-357
Astronomy and Astrophysics
Astrophysics
7
Surveys, X-Rays: Stars, Stars: Neutron, White Dwarfs
Scientific paper
This is the second in a series of three papers constraining the number of detectable old neutron stars in the Galaxy. Here, I present the statistical analysis of a sample of X-ray sources coincident with areas of dark clouds in the Galactic plane. I compare this sample with all sources in the ROSAT All-Sky Survey bright source catalog within 20(deg) of the Galactic plane. I present the results of an identification program of a subset of sources that are compatible with a soft, thermal X-ray spectrum and an effective source temperature of less than 70eV. The three brightest sources in this sample form an intriguing subgroup. One of them is a previously identified candidate for an accreting neutron star. I identify the other two sources with hot white dwarf stars. I find no new accreting neutron star candidate in this sample. Based on this result, I derive an upper limit to the space density of accreting neutron stars in fields of Galactic dark clouds of ~ 2sr(-1) at a count rate >0.05s(-1) .
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