Stellar proper motions in the Galactic bulge from deep <i>Hubble Space Telescope</i> ACS WFC photometry

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dc.contributor.authorClarkson, Will
dc.contributor.authorSahu, Kailash
dc.contributor.authorAnderson, Jay
dc.contributor.authorSmith, T. Ed
dc.contributor.authorBrown, Thomas M.
dc.contributor.authorRich, R. Michael
dc.contributor.authorCasertano, Stefano
dc.contributor.authorBond, Howard E.
dc.contributor.authorLivio, Mario
dc.contributor.authorMinniti, Dante
dc.contributor.authorPanagia, Nino
dc.contributor.authorRenzini, Alvio
dc.contributor.authorValenti, Jeff
dc.contributor.authorZoccali, Manuela
dc.date.accessioned2025-01-21T01:05:00Z
dc.date.available2025-01-21T01:05:00Z
dc.date.issued2008
dc.description.abstractWe present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search ( SWEEPS) project using ACS WFC on HST. Proper motions are extracted for more than 180,000 objects, with > 81,000 measured to accuracy better than 0.3 mas yr(-1) in both coordinates. We report several results based on these measurements: ( 1) Kinematic separation of bulge from disk allows a sample of > 15,000 bulge objects to be extracted based on > 6 sigma detections of proper motion, with < 0.2% contamination from the disk. This includes the first detection of a candidate bulge blue straggler population. ( 2) Armed with a photometric distance modulus on a star-by-star basis, and using the large number of stars with high-quality proper-motion measurements to overcome intrinsic scatter, we dissect the kinematic properties of the bulge as a function of distance along the line of sight. This allows us to extract the stellar circular speed curve from proper motions alone, which we compare with the circular speed curve obtained from radial velocities. ( 3) We trace the variation of the {l, b} velocity ellipse as a function of depth. ( 4) Finally, we use the density-weighted {l, b} proper-motion ellipse produced from the tracer stars to assess the kinematic membership of the 16 transiting planet candidates discovered in the Sagittarius Window; the kinematic distribution of the planet candidates is consistent with that of the disk and bulge stellar populations.
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95774
dc.identifier.wosidWOS:000258889000026
dc.issue.numero2
dc.language.isoen
dc.pagina.final1142
dc.pagina.inicio1110
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxy : bulge
dc.subjectGalaxy : disk
dc.subjectGalaxy : kinematics and dynamics
dc.subjectinstrumentation : high angular resolution
dc.subjectmethods : data analysis
dc.subjecttechniques : photometric
dc.titleStellar proper motions in the Galactic bulge from deep <i>Hubble Space Telescope</i> ACS WFC photometry
dc.typeartículo
dc.volumen684
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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