Journal Article

Satellite kinematics – III. Halo masses of central galaxies in SDSS

Surhud More, Frank C. van den Bosch, Marcello Cacciato, Ramin Skibba, H. J. Mo and Xiaohu Yang

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 1, pages 210-226
Published in print January 2011 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17436.x
Satellite kinematics – III. Halo masses of central galaxies in SDSS

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We use the kinematics of satellite galaxies that orbit around the central galaxy in a dark matter halo to infer the scaling relations between halo mass and central galaxy properties. Using galaxies from the Sloan Digital Sky Survey, we investigate the halo mass–luminosity relation (MLR) and the halo mass–stellar mass relation (MSR) of central galaxies. In particular, we focus on the dependence of these scaling relations on the colour of the central galaxy. We find that red central galaxies on average occupy more massive haloes than blue central galaxies of the same luminosity. However, at fixed stellar mass there is no appreciable difference in the average halo mass of red and blue centrals, especially for M*≲ 1010.5 h−2 M. This indicates that stellar mass is a better indicator of halo mass than luminosity. Nevertheless, we find that the scatter in halo masses at fixed stellar mass is non-negligible for both red and blue centrals. It increases as a function of stellar mass for red centrals but shows a fairly constant behaviour for blue centrals. We compare the scaling relations obtained in this paper with results from other independent studies of satellite kinematics, with results from a SDSS galaxy group catalog, from galaxy–galaxy weak lensing measurements and from subhalo abundance matching studies. Overall, these different techniques yield MLRs and MSRs in fairly good agreement with each other (typically within a factor of 2), indicating that we are converging on an accurate and reliable description of the galaxy–dark matter connection. We briefly discuss some of the remaining discrepancies among the various methods.

Keywords: methods: statistical; galaxies: haloes; galaxies: kinematics and dynamics; galaxies: structure; dark matter

Journal Article.  11452 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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