The Apache Point Observatory Galactic Evolution Experiment: First Detection of High-Velocity Milky Way Bar Stars

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dc.contributor.utaustinauthorShetrone, Matthewen_US
dc.creatorNidever, David L.en_US
dc.creatorZasowski, Gailen_US
dc.creatorMajewski, Steven R.en_US
dc.creatorBird, Jonathanen_US
dc.creatorRobin, Annie C.en_US
dc.creatorMartinez-Valpuesta, Inmaen_US
dc.creatorBeaton, Rachael L.en_US
dc.creatorSchoenrich, Ralphen_US
dc.creatorSchultheis, Mathiasen_US
dc.creatorWilson, John C.en_US
dc.creatorSkrutskie, Michael F.en_US
dc.creatorO'Connell, Robert W.en_US
dc.creatorShetrone, Matthewen_US
dc.creatorSchiavon, Ricardo P.en_US
dc.creatorJohnson, Jennifer A.en_US
dc.creatorWeiner, Benjaminen_US
dc.creatorGerhard, Ortwinen_US
dc.creatorSchneider, Donald P.en_US
dc.creatorPrieto, Carlos Allendeen_US
dc.creatorSellgren, Krisen_US
dc.creatorBizyaev, Dmitryen_US
dc.creatorBrewington, Howarden_US
dc.creatorBrinkmann, Jonen_US
dc.creatorEisenstein, Daniel J.en_US
dc.creatorFrinchaboy, Peter M.en_US
dc.creatorPerez, Ana Elia Garciaen_US
dc.creatorHoltzman, Jonen_US
dc.creatorHearty, Fred R.en_US
dc.creatorMalanushenko, Elenaen_US
dc.creatorMalanushenko, Viktoren_US
dc.creatorMuna, Demitrien_US
dc.creatorOravetz, Danielen_US
dc.creatorPan, Kaikeen_US
dc.creatorSimmons, Audreyen_US
dc.creatorSnedden, Stephanieen_US
dc.creatorWeaver, Benjamin A.en_US
dc.date.accessioned2016-10-28T19:34:06Z
dc.date.available2016-10-28T19:34:06Z
dc.date.issued2012-08en_US
dc.description.abstractCommissioning observations with the Apache Point Observatory Galactic Evolution Experiment (APOGEE), part of the Sloan Digital Sky Survey III, have produced radial velocities (RVs) for similar to 4700 K/M-giant stars in the Milky Way (MW) bulge. These high-resolution (R similar to 22,500), high-S/N (>100 per resolution element), near-infrared (NIR; 1.51-1.70 mu m) spectra provide accurate RVs (epsilon(V) similar to 0.2 km s(-1)) for the sample of stars in 18 Galactic bulge fields spanning -1 degrees < l < 20 degrees, vertical bar b vertical bar < 20 degrees, and delta > -32 degrees. This represents the largest NIR high-resolution spectroscopic sample of giant stars ever assembled in this region of the Galaxy. A cold (sigma(V) similar to 30 km s(-1)), high-velocity peak (V-GSR approximate to + 200 km s(-1)) is found to comprise a significant fraction (similar to 10%) of stars in many of these fields. These high RVs have not been detected in previous MW surveys and are not expected for a simple, circularly rotating disk. Preliminary distance estimates rule out an origin from the background Sagittarius tidal stream or a new stream in the MW disk. Comparison to various Galactic models suggests that these high RVs are best explained by stars in orbits of the Galactic bar potential, although some observational features remain unexplained.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipSDSS-III/APOGEEen_US
dc.description.sponsorshipNSF AST-0807945en_US
dc.description.sponsorshipNASA Earth & Space Science Fellowshipen_US
dc.description.sponsorshipFrench Agence Nationale de la Recherche ANR-2010-BLAN-0508-01OTPen_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.description.sponsorshipParticipating Institutionsen_US
dc.description.sponsorshipNational Science Foundationen_US
dc.description.sponsorshipU.S. Department of Energy Office of Scienceen_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.identifierdoi:10.15781/T2HM52N43
dc.identifier.citationNidever, David L., Gail Zasowski, Steven R. Majewski, Jonathan Bird, Annie C. Robin, Inma Martinez-Valpuesta, Rachael L. Beaton et al. "The Apache Point Observatory Galactic Evolution Experiment: First Detection of High-velocity Milky Way Bar Stars." The Astrophysical Journal, Vol. Letters 755, No. 2 (Aug., 2012): L25.en_US
dc.identifier.doi10.1088/2041-8205/755/2/l25en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/42909
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxy: bulgeen_US
dc.subjectgalaxy: kinematics and dynamicsen_US
dc.subjectgalaxy: structureen_US
dc.subjectsurveysen_US
dc.subjecton spiral galaxiesen_US
dc.subjectstellar barsen_US
dc.subjectdata releaseen_US
dc.subjectsky surveyen_US
dc.subjectlong baren_US
dc.subjectbulgeen_US
dc.subjectdiagnosticsen_US
dc.subjectkinematicsen_US
dc.subjectsystemsen_US
dc.subjectsampleen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Apache Point Observatory Galactic Evolution Experiment: First Detection of High-Velocity Milky Way Bar Starsen_US
dc.typeArticleen_US

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