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 hvsanisotropy.tex ApJ, 2009, 690, L69
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% arXiv:0811.0612

\documentclass[12pt,preprint]{aastex}
\begin{document}

\title{ THE ANISOTROPIC SPATIAL DISTRIBUTION OF HYPERVELOCITY STARS }

\author{Warren R.\ Brown,
	Margaret J.\ Geller,
	Scott J.\ Kenyon}

\affil{Smithsonian Astrophysical Observatory, 60 Garden St, Cambridge, MA 02138}
\email{ wbrown@cfa.harvard.edu, mgeller@cfa.harvard.edu, skenyon@cfa.harvard.edu}

\and    \author{Benjamin C.\ Bromley}
\affil{Department of Physics, University of Utah, 115 S 1400 E, Rm 201, Salt Lake City, UT 84112}
 \email{bromley@physics.utah.edu}

\begin{abstract}

	We study the distribution of angular positions and angular
separations of unbound hypervelocity stars (HVSs).  HVSs are spatially
anisotropic at the 3-$\sigma$ level.  The spatial anisotropy is
significant in Galactic longitude, not in latitude, and the inclusion of
lower velocity, possibly bound HVSs reduces the significance of the
anisotropy.  These observations are plausibly explained by an anisotropic
central bulge potential.  In the future, measuring the distribution of
HVSs in the southern sky will provide additional constraints on the
spatial anisotropy and the origin of HVSs.

\end{abstract}

\end{document}