Measuring Dark Matter Profiles Non-Parametrically In Dwarf Spheroidals: An Application To Draco

dc.contributor.utaustinauthorJardel, John R.en_US
dc.contributor.utaustinauthorGebhardt, Karlen_US
dc.creatorJardel, John R.en_US
dc.creatorGebhardt, Karlen_US
dc.creatorFabricius, Maximilian H.en_US
dc.creatorDrory, Niven_US
dc.creatorWilliams, M. J.en_US
dc.date.accessioned2016-04-28T19:35:39Z
dc.date.available2016-04-28T19:35:39Z
dc.date.issued2013-02en
dc.description.abstractWe introduce a novel implementation of orbit-based (or Schwarzschild) modeling that allows dark matter density profiles to be calculated non-parametrically in nearby galaxies. Our models require no assumptions to be made about velocity anisotropy or the dark matter profile. The technique can be applied to any dispersion-supported stellar system, and we demonstrate its use by studying the Local Group dwarf spheroidal galaxy (dSph) Draco. We use existing kinematic data at larger radii and also present 12 new radial velocities within the central 13 pc obtained with the VIRUS-W integral field spectrograph on the 2.7 m telescope at McDonald Observatory. Our non-parametric Schwarzschild models find strong evidence that the dark matter profile in Draco is cuspy for 20 <= r <= 700 pc. The profile for r >= 20 pc is well fit by a power law with slope alpha = -1.0 +/- 0.2, consistent with predictions from cold dark matter simulations. Our models confirm that, despite its low baryon content relative to other dSphs, Draco lives in a massive halo.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNSF-0908639en_US
dc.identifierdoi:10.15781/T2MB9H
dc.identifier.Filename2013_02_measuringdarkmatter.pdfen_US
dc.identifier.citationJardel, John R., Karl Gebhardt, Maximilian H. Fabricius, Niv Drory, and Michael J. Williams. "Measuring dark matter profiles non-parametrically in dwarf spheroidals: an application to Draco." The Astrophysical Journal, Vol. 763, No. 2 (Feb., 2013): 91.en_US
dc.identifier.doi10.1088/0004-637x/763/2/91en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34845
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: dwarfen_US
dc.subjectgalaxies: individual (draco)en_US
dc.subjectgalaxies:en_US
dc.subjectkinematics and dynamicsen_US
dc.subjectlocal groupen_US
dc.subjectaxisymmetrical dynamical modelsen_US
dc.subjectearly-type galaxiesen_US
dc.subjectto-light ratiosen_US
dc.subjectblack-holeen_US
dc.subject3-integral modelsen_US
dc.subjectstellar structureen_US
dc.subjectspiral galaxiesen_US
dc.subjectdensity profileen_US
dc.subjectdisc galaxiesen_US
dc.subjectorbit modelsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleMeasuring Dark Matter Profiles Non-Parametrically In Dwarf Spheroidals: An Application To Dracoen_US
dc.typeArticleen_US
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