From: LARRY KLAES (ljk4_at_msn.com)
Date: Thu Mar 01 2007 - 14:59:59 PST
Astrophysics, abstract
astro-ph/0702735
From: Vasilii Gvaramadze [view email]
Date: Wed, 28 Feb 2007 10:33:42 GMT (59kb)
Hyperfast pulsars as the remnants of massive stars ejected from young star
clusters
Authors: V.V.Gvaramadze, A.Gualandris, S.Portegies Zwart
Comments: 11 pages, 6 figures, 1 table
Recent proper motion and parallax measurements for the pulsar PSR B1508+55
gave the highest (transverse) velocity (~1100 km/s) ever measured for a
neutron star (Chatterjee et al. 2005). The spin-down characteristics of PSR
B1508+55 (typical of non-recycled pulsars) imply that the high velocity of
this pulsar cannot be solely due to disruption of a tight massive binary
system. A possible way to account for the high velocity of PSR B1508+55 is
to assume that at least a part of this velocity is due to a natal kick or a
post-natal acceleration (Chatterjee et al. 2005). We propose an alternative
explanation for the origin of hyperfast pulsars based on the idea that they
could be the remnants of a symmetric supernova explosion of a high-velocity
massive star (or its helium core) which attained its peculiar velocity
(similar to that of the pulsar) in the course of a strong three or four body
dynamical encounter in the core of the parent young massive star cluster.
Our proposal implies that the dense cores of young massive star clusters
(located either in the Galactic disk or near the Galactic centre) could also
produce the so-called hypervelocity stars (Brown et al. 2005) -- the
ordinary stars moving with a speed of ~1000 km/s.
http://arxiv.org/abs/astro-ph/0702735
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