------------------------------------------------------------------------
 hypervelocity.tex MNRAS, Oct 2005, accepted
Message-ID: <Pine.SOL.4.58.0601231024490.16400@cfa0.cfa.harvard.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-MailScanner-Information: Please contact postmaster@aoc.nrao.edu for more information
X-MailScanner: Found to be clean
X-MailScanner-SpamCheck: not spam, SpamAssassin (score=0, required 5,
	autolearn=disabled)
X-MailScanner-From: iginsbur@cfa.harvard.edu


%astro-ph/0510574

\documentclass[usenatbib,usegraphicx,useAMS]{mn2e}
\usepackage{amsmath}
\usepackage{amssymb}

%%% Temp Stuff
%\topmargin=-1.5cm

%%% Abbreviations
\input{journal_abbr}  % Common journal abbreviations
\input{standard_abbr} % Standard abbreviations
\input{unit_abbr} % Unit abbreviations

%%% Local Definitions
\newcommand{\SgrA}{Sgr A$^*$}

%%% Figure Files
%\def\LineFigPath{Figures}
%\def\ImageFigPath{Figures/LowResImages}
%\def\ImageFigPath{Figures/Images}

%%% Special Symbols
\renewcommand{\d}{{\rm d}}
\newcommand{\e}{{\rm e}}


\title{The Fate of Former Companions to Hypervelocity Stars Originating at
the Galactic Center}

\author[Idan Ginsburg \& Abraham Loeb]{Idan Ginsburg\thanks{E-mail:
iginsburg@cfa.harvard.edu} \& Abraham
Loeb\thanks{E-mail:aloeb@cfa.harvard.edu}\\ Harvard-Smithsonian Center for
Astrophysics, 60 Garden St., MS 51, Cambridge, MA 02138, USA\\}


\begin{document}
\maketitle

\begin{abstract}

The hypervelocity star SDSS J090745.0+024507 in the halo of the Milky Way
galaxy \citep{Brown:05} most likely originated from the breakup of a
binary
star system by the central black hole, SgrA* \citep{Hills:88}. We examine
the fate of former binary companions to similar hypervelocity stars (HVSs)
by simulating 600 different binary orbits around SgrA* with a direct
N-body
integration code.  For some orbital parameters, the binary breakup process
leads to HVSs with ejection velocities that are almost an order of
magnitude
larger than the velocity observed for SDSS J090745.0+024507. The former
companion stars populate highly eccentric orbits which resemble the
observed orbits for some of the stars nearest to SgrA*.

\end{abstract}