Hypervelocity Stars. I. The Spectroscopic Survey

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dc.creatorBrown, Warren R.
dc.creatorGeller, Margaret J.
dc.creatorKenyon, Scott J.
dc.creatorKurtz, Michael J.
dc.date2006-04-05
dc.date2006-04-13
dc.date.accessioned2026-07-07T10:43:45Z
dc.date.available2026-07-07T10:43:45Z
dc.descriptionWe discuss our targeted search for hypervelocity stars (HVSs), stars traveling with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Our survey, now half complete, has successfully identified a total of four probable HVSs plus a number of other unusual objects. Here we report the most recently discovered two HVSs: SDSS J110557.45+093439.5 and possibly SDSS J113312.12+010824, traveling with Galactic rest-frame velocities at least +508+-12 and +418+-10 km/s, respectively. The other late B-type objects in our survey are consistent with a population of post main-sequence stars or blue stragglers in the Galactic halo, with mean metallicity [Fe/H]=-1.3 and velocity dispersion 108+-5 km/s. Interestingly, the velocity distribution shows a tail of objects with large positive velocities that may be a mix of low-velocity HVSs and high-velocity runaway stars. Our survey also includes a number of DA white dwarfs with unusually red colors, possibly extremely low mass objects. Two of our objects are B supergiants in the Leo A dwarf, providing the first spectroscopic evidence for star formation in this dwarf galaxy within the last ~30 Myr.
dc.description10 pages, uses emulateapj, accepted by ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0604111
dc.identifierhttp://arxiv.org/abs/astro-ph/0604111
dc.identifierAstrophys.J.647:303-311,2006
dc.identifierdoi:10.1086/505165
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182354
dc.subjectAstrophysics
dc.titleHypervelocity Stars. I. The Spectroscopic Survey
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