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Astron. Astrophys. 321, 696-702 (1997)

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X-ray emission from neutron stars in dark clusters

F. De Paolis 1, 2 and G. Ingrosso 1, 2

1 Dipartimento di Fisica, Università degli Studi di Lecce, CP 193, I-73100 Lecce, Italy
2 INFN, Sezione di Lecce, CP 193, I-73100 Lecce, Italy

Received 15 June 1996 / Accepted 15 November 1996

Abstract

Two classes of neutron stars may exist in the galactic halo: neutron stars originating in the disk with high velocities and neutron stars originating in globular clusters (via Type II supernovae and/or accretion induced collapse). Moreover, the halo dark matter is likely in the form of dark clusters composed of MACHOs and cold molecular clouds. Here we propose a model in which neutron stars crossing dark clusters in the galactic halo accrete material and emit in the X-ray band. The detection of these X-ray sources whose luminosity can span several orders of magnitude from [FORMULA] to [FORMULA] erg s-1 could be already done by ROSAT.

Key words: dark matter – Galaxy: halo – neutron stars – X-rays: general; stars

Send offprint requests to: G. Ingrosso

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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