EDP Sciences
Free access
Volume 406, Number 1, July IV 2003
Page(s) 111 - 117
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20030680

A&A 406, 111-117 (2003)
DOI: 10.1051/0004-6361:20030680

Young isolated neutron stars from the Gould Belt

S. B. Popov1, 2, M. Colpi3, M. E. Prokhorov1, A. Treves4 and R. Turolla2

1  Sternberg Astronomical Institute, Universitetski pr. 13, 119992 Moscow, Russia
    e-mail: mike@sai.msu.ru
2  Università di Padova, Dipartimento di Fisica, via Marzolo 8, 35131, Padova, Italy
    e-mail: turolla@pd.infn.it; popov@pd.infn.it
3  Università di Milano-Bicocca, Dipartimento di Fisica, Piazza della Scienza 3, 20126, Milano, Italy
    e-mail: Monica.Colpi@mib.infn.it
4  Università dell'Insubria, Dipartimento di Scienze, via Vallegio 11, 22100, Como, Italy
    e-mail: treves@mib.infn.it

(Received 27 November 2002 / Accepted 2 April 2003)

The origin of the local population of young, cooling neutron stars is investigated with a population synthesis model taking into account the contribution of neutron stars born in the Gould Belt, in addition to those originating in the Galactic disk. We estimate their emission in the soft X-ray band as a function of distance and age and construct the Log  N-Log  S distribution. It is shown that the inclusion of neutron stars from the Gould Belt provides a good fit to the observed Log  N-Log  S distribution. As the Sun is situated inside the Gould Belt, one can naturally explain the comparative local overabundance of massive progenitors and can remove the difficulty of the deficit of relatively bright ( $\ga$0.1 ROSAT PSPC cts s -1) cooling neutron stars previously reported from models where only neutron stars from the Galactic disk were accounted for.

Key words: stars: neutron -- stars: evolution -- stars: statistics -- X-rays: stars

Offprint request: S. B. Popov, polar@sai.msu.ru

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