Статья

THE STRUCTURE AND DYNAMICS OF MASSIVE EARLY-TYPE GALAXIES: ON HOMOLOGY, ISOTHERMALITY, AND ISOTROPY INSIDE ONE EFFECTIVE RADIUS

L. V. E. KoopmansKapteyn Astronomical Institute, University of Groningen, P.O.Box 800, 9700 AV Groningen, The Netherlands; [email protected]A. BoltonInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI 96822, USA; [email protected]Tommaso TreuDepartment of Physics, University of California, Santa Barbara, CA 93106, USA; [email protected]O. CzoskeKapteyn Astronomical Institute, University of Groningen, P.O.Box 800, 9700 AV Groningen, The Netherlands; [email protected]Matthew W. AugerDepartment of Physics, University of California, Santa Barbara, CA 93106, USA; [email protected]Matteo BarnabèKapteyn Astronomical Institute, University of Groningen, P.O.Box 800, 9700 AV Groningen, The Netherlands; [email protected]S. VegettiKapteyn Astronomical Institute, University of Groningen, P.O.Box 800, 9700 AV Groningen, The Netherlands; [email protected]R. GavazziInstitut d'Astrophysique de Paris, UMR7095 CNRS - Université Paris 6, 98bis Bd Arago, 75014 Paris, France; [email protected]Leonidas A. MoustakasJPL/Caltech, MS 169-327, 4800 Oak Grove Dr., Pasadena, CA 91109, USA; [email protected]Scott BurlesDepartment of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA; [email protected]

2009en

ABI

Аннотация

Based on 58 SLACS strong-lens early-type galaxies (ETGs) with direct total-mass and stellar-velocity dispersion measurements, we find that inside one effective radius massive elliptical galaxies with M eff 3 10 10 M are well approximated by a power-law ellipsoid, with an average logarithmic density slope of LD -d log( tot )/d log(r) = 2.085 +0.025 -0.018 (random error on mean) for isotropic orbits with r = 0, 0.1 (syst.) and 0.20 +0.04 -0.02 intrinsic scatter (all errors indicate the 68% CL). We find no correlation of LD with galaxy mass (M eff ), rescaled radius (i.e., R einst /R eff ) or redshift, despite intrinsic differences in density-slope between galaxies. Based on scaling relations, the average logarithmic density slope can be derived in an alternative manner, fully independent from dynamics, yielding SR = 1.959 0.077. Agreement between the two values is reached for r = 0.45 0.25, consistent with mild radial anisotropy. This agreement supports the robustness of our results, despite the increase in mass-to-light ratio with total galaxy mass:

Перевод пока недоступен

Идентификаторы

DOI: 10.1088/0004-637x/703/1/l51

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar