The Magnificent Seven in the dusty prairie |
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Authors: | B Posselt S B Popov F Haberl J Trümper R Turolla R Neuhäuser |
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Institution: | 1. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748, Garching, Germany 4. Astrophysikalisches Institut und Universit?ts-Sternwarte, Schillerg??chen 2-3, 07745, Jena, Germany 2. Sternberg Astronomical Institute, Universitetskiy pr. 13, Moscow, 119992, Russia 3. INFN-Sezione di Padova, Dipartimento di Fisica Galileo Galilei, Via Marzolo 8, 35131, Padova, Italy
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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.
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Keywords: | Neutron stars Absorption ISM X-ray:general |
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