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dc.creatorMurphy, Jeremy D.en_US
dc.creatorGebhardt, Karlen_US
dc.creatorCradit, Masonen_US
dc.date.accessioned2016-04-28T19:32:47Z
dc.date.available2016-04-28T19:32:47Z
dc.date.issued2014-04en
dc.identifierdoi:10.15781/T2QV4Q
dc.identifier.citationMurphy, Jeremy D., Karl Gebhardt, and Mason Cradit. "The Rising Stellar Velocity Dispersion of M87 from Integrated Starlight." The Astrophysical Journal, Vol. 785, No. 2 (Apr., 2014): 143.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34697
dc.description.abstractWe have measured the line-of-sight velocity distribution from integrated stellar light at two points in the outer halo of M87 (NGC 4486), the second-rank galaxy in the Virgo Cluster. The data were taken at R = 480 '' (similar to 41.5 kpc) and R = 526 '' (similar to 45.5 kpc) along the SE major axis. The second moment for a non-parametric estimate of the full velocity distribution is 420 +/- 23 km s(-1) and 577 +/- 35 km s(-1), respectively. There is intriguing evidence in the velocity profiles for two kinematically distinct stellar components at the position of our pointing. Under this assumption, we employ a two-Gaussian decomposition and find the primary Gaussian having rest velocities equal to M87 (consistent with zero rotation) and second moments of 383 +/- 32 km s(-1) and 446 +/- 43 km s(-1), respectively. The asymmetry seen in the velocity profiles suggests that the stellar halo of M87 is not in a relaxed Stateand confuses a clean dynamical interpretation. That said, either measurement (full or two component model) shows a rising velocity dispersion at large radii, consistent with previous integrated light measurements, yet significantly higher than globular cluster measurements at comparable radial positions. These integrated light measurements at large radii, and the stark contrast they make to the measurements of other kinematic tracers, highlight the rich kinematic complexity of environments like the center of the Virgo Cluster and the need for caution when interpreting kinematic measurements from various dynamical tracers.en_US
dc.description.sponsorshipNSF Astronomy and Astrophysics Postdoctoral Fellowship AST-1203057en_US
dc.description.sponsorshipUT Continuing University Fellowshipen_US
dc.description.sponsorshipPhysics Department at Southwestern Universityen_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.description.sponsorshipNSF-0908639en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_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.subjectdark matteren_US
dc.subjectgalaxies: elliptical and lenticular, cden_US
dc.subjectgalaxies:en_US
dc.subjectindividual (m87, ngc 4486)en_US
dc.subjectgalaxies: kinematics and dynamicsen_US
dc.subjectearly-type galaxiesen_US
dc.subjectbrightest cluster galaxiesen_US
dc.subjectsimilar-to 2en_US
dc.subjectintracluster planetary-nebulaeen_US
dc.subjectmassive elliptic galaxiesen_US
dc.subjecthubble-space-telescopeen_US
dc.subjectstar-forming galaxiesen_US
dc.subjectdigital sky surveyen_US
dc.subjectinside-out growthen_US
dc.subjectdark-matter haloen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Rising Stellar Velocity Dispersion Of M87 From Integrated Starlighten_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.description.departmentMcDonald Observatoryen_US
dc.identifier.Filename2014_04_risingstellar.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/785/2/143en_US
dc.contributor.utaustinauthorGebhardt, Karlen_US
dc.relation.ispartofserialAstrophysical Journalen_US


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