Astrophysics and Space Science

, Volume 308, Issue 1–4, pp 171–179 | Cite as

The Magnificent Seven in the dusty prairie

The role of interstellar absorption on the observed neutron star population
  • B. Posselt
  • S. B. Popov
  • F. Haberl
  • J. Trümper
  • R. Turolla
  • R. Neuhäuser
Original Article

Abstract

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 objects 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, Astron. Astrophys. 411, 447) 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.

Keywords

Neutron stars Absorption ISM X-ray:general 

PACS

97.60.Jd 98.38.-j 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • B. Posselt
    • 1
    • 4
  • S. B. Popov
    • 2
  • F. Haberl
    • 1
  • J. Trümper
    • 1
  • R. Turolla
    • 3
  • R. Neuhäuser
    • 4
  1. 1.Max-Planck-Institut für extraterrestrische PhysikGarchingGermany
  2. 2.Sternberg Astronomical InstituteMoscowRussia
  3. 3.INFN-Sezione di Padova, Dipartimento di Fisica Galileo GalileiPadovaItaly
  4. 4.Astrophysikalisches Institut und Universitäts-SternwarteJenaGermany

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