Galaxy Kinematics With Virus-P: The Dark Matter Halo Of M87

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dc.contributor.utaustinauthorMurphy, Jeremy D.en_US
dc.contributor.utaustinauthorGebhardt, Karlen_US
dc.contributor.utaustinauthorAdams, Joshua J.en_US
dc.creatorMurphy, Jeremy D.en_US
dc.creatorGebhardt, Karlen_US
dc.creatorAdams, Joshua J.en_US
dc.date.accessioned2016-04-28T19:38:22Z
dc.date.available2016-04-28T19:38:22Z
dc.date.issued2011-03en
dc.description.abstractWe present two-dimensional stellar kinematics of M87 out to R = 238 '' taken with the integral field spectrograph VIRUS-P. We run a large set of axisymmetric, orbit-based dynamical models and find clear evidence for a massive dark matter halo. While a logarithmic parameterization for the dark matter halo is preferred, we do not constrain the dark matter scale radius for a Navarro-Frenk-White (NFW) profile and therefore cannot rule it out. Our best-fit logarithmic models return an enclosed dark matter fraction of 17.2(-5.0)(+5.0)% within one effective radius (R-e congruent to 100 ''), rising to 49.4(-8.8)(+7.2)% within 2 R-e. Existing SAURON data (R <= 13 ''), and globular cluster (GC) kinematic data covering 145 '' <= R <= 554 '' complete the kinematic coverage to R = 47 kpc (similar to 5R(e)). At this radial distance, the logarithmic dark halo comprises 85.3(-2.4)(+2.5)% of the total enclosed mass of 5.7(-0.9)(+1.3) x 10(12) M-circle dot making M87 one of the most massive galaxies in the local universe. Our best-fit logarithmic dynamical models return a stellar mass-to-light ratio (M/L) of 9.1(-0.2)(+0.2) (V band), a dark halo circular velocity of 800(-25)(+75) km s(-1), and a dark halo scale radius of 36(-3)(+7) kpc. The stellar M/L, assuming an NFW dark halo, is well constrained to 8.20(-0.10)(+0.05) (V band). The stars in M87 are found to be radially anisotropic out to R congruent to 0.5 R-e, then isotropic or slightly tangentially anisotropic to our last stellar data point at R = 2.4 R-e where the anisotropy of the stars and GCs are in excellent agreement. The GCs then become radially anisotropic in the last two modeling bins at R = 3.4 R-e and R = 4.8 R-e. As one of the most massive galaxies in the local universe, constraints on both the mass distribution of M87 and anisotropy of its kinematic components strongly inform our theories of early-type galaxy formation and evolution in dense environments.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipen_US
dc.identifierdoi:10.15781/T24J97
dc.identifier.Filename2011_03_galaxykinematics.pdfen_US
dc.identifier.citationMurphy, Jeremy D., Karl Gebhardt, and Joshua J. Adams. "Galaxy kinematics with VIRUS-P: the dark matter halo of M87." The Astrophysical Journal, Vol. 729, No. 2 (Mar., 2011): 129.en_US
dc.identifier.doi10.1088/0004-637x/729/2/129en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34988
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_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.subjectdark matteren_US
dc.subjectgalaxies: elliptical and lenticular, cden_US
dc.subjectgalaxies:en_US
dc.subjectkinematics and dynamicsen_US
dc.subjectaxisymmetrical dynamical modelsen_US
dc.subjectintegral-field spectroscopyen_US
dc.subjectglobular-cluster systemen_US
dc.subjectblack-hole massen_US
dc.subjectto-light ratioen_US
dc.subjectellipticen_US
dc.subjectgalaxiesen_US
dc.subjectvelocity profilesen_US
dc.subjectsky-subtractionen_US
dc.subjectx-rayen_US
dc.subjectstellar-systemsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleGalaxy Kinematics With Virus-P: The Dark Matter Halo Of M87en_US
dc.typeArticleen_US

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