Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-11
Astrophys.SpaceSci.308:171-179,2007
Astronomy and Astrophysics
Astrophysics
8 pages, 7 figures; to appear in Astrophysics and Space Science, in the proceedings of "Isolated Neutron Stars: from the Inter
Scientific paper
10.1007/s10509-007-9344-8
The Magnificent Seven have all been discovered by their exceptional soft X-ray spectra and high ratios of X-ray to optical flux. They all are considered to be nearby sources. Searching for similar neutron stars with larger distances, one expects larger interstellar absorption resulting in harder X-ray counterparts. Current interstellar absorption treatment depends on chosen abundances and scattering cross-sections of the elements as well as on the 3D distribution of the interstellar medium. After a discussion of these factors we use the comprehensive 3D measurements of the Local Bubble by Lallement et al. 2003 to construct two simple models of the 3D distribution of the hydrogen column density. We test these models by using a set of soft X-ray sources with known distances. Finally, we discuss possible applications for distance estimations and population synthesis studies.
Haberl Franck
Neuhaeuser Ralph
Popov Sergei B.
Posselt Bettina
Truemper Joachim
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