Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-09-19
Astronomy and Astrophysics
Astrophysics
6 pages, to be processed with Springer-Verlag TeX A&A macro package 1992
Scientific paper
Old isolated accreting neutron stars may show up among unidentified soft X--ray sources detected by the ROSAT All Sky Survey. We argue that the chances of identification are greater for ONSs located in the closest overdense regions of the solar neighbourhood. In particular, we consider the neutral hydrogen wall in the second Galactic quadrant ($15^\circ < l < 150^\circ$) which shrinks the estimated contour of the Local Bubble to $\approx 16-30$ pc. Due to their vicinity, we expect $\sim 10$ ONSs to be detectable at a relatively high flux limit ($\sim 0.1$ counts/s) in the 0.2--2.4 keV band. This implies that about 5 \% of unidentified sources above this threshold could be ONSs. No optical counterpart is present, but EUV emission from these objects could be detected using EUVE Lex filter at the highest sensitivity limits.
Treves Aldo
Turolla Roberto
Zampieri Luca
Zane Silvia
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