Journal Article

Halo millisecond pulsars ejected by intermediate-mass black holes in globular clusters

A. Sesana, N. Sartore, B. Devecchi and A. Possenti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 1, pages 502-513
Published in print November 2012 | ISSN: 0035-8711
Published online November 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21958.x
Halo millisecond pulsars ejected by intermediate-mass black holes in globular clusters

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Intermediate-mass black holes (IMBHs) are among the most elusive objects in contemporary astrophysics. Both theoretical and observational evidence of their existence are subject of debate. Conversely, both theory and observations confirm the presence of a large population of millisecond pulsars (MSPs) with low-mass companions residing in globular cluster (GC) centres. If IMBHs are common in GC centres as well, then dynamical interactions will inevitably break up many of these binaries, causing the ejection of several fast MSPs in the Galactic halo. Such population of fast halo MSPs, hard to produce with ‘standard’ MSP generation mechanisms, would provide a strong, albeit indirect, evidence of the presence of a substantial population of IMBHs in GCs. In this paper, we study in detail the dynamical formation and evolution of such fast MSPs population, highlighting the relevant observational properties and assessing detection prospects with forthcoming radio surveys.

Keywords: black hole physics; techniques: radar astronomy; stars: kinematics and dynamics; pulsars: general; globular clusters: general

Journal Article.  10057 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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