KiDS+GAMA: The weak lensing calibrated stellar-to-halo mass relation of central and satellite galaxies

Andrej Dvornik, Henk Hoekstra, Konrad Kuijken, Angus H. Wright, Marika Asgari, Maciej Bilicki, Thomas Erben, Benjamin Giblin, Alister W. Graham, Catherine Heymans, Hendrik Hildebrandt, Andrew M. Hopkins, Arun Kannawadi, Chieh-An Lin, Edward N. Taylor, Tilman Tröster

Research output: Contribution to journalArticlepeer-review


We simultaneously present constraints on the stellar-to-halo mass relation for central and satellite galaxies through a weak lensinganalysis of spectroscopically classified galaxies. Using overlapping data from the fourth data release of the Kilo-Degree Survey(KiDS), and the Galaxy And Mass Assembly survey (GAMA), we find that satellite galaxies are hosted by halo masses that are0.53±0.39 dex (68% confidence, 3σdetection) smaller than those of central galaxies of the same stellar mass (for a stellar mass of log(M/M)=10.6). This is consistent with galaxy formation models, whereby infalling satellite galaxies are preferentially strippedof their dark matter. We find consistent results with similar uncertainties when comparing constraints from a standard azimuthallyaveraged galaxy-galaxy lensing analysis and a two-dimensional likelihood analysis of the full shear field. As the latter approach issomewhat biased due to the lens incompleteness and as it does not provide any improvement to the precision when applied to actualdata, we conclude that stacked tangential shear measurements are best-suited for studies of the galaxy-halo connectio
Original languageEnglish
Article numberA83
Number of pages11
JournalAstronomy and Astrophysics
Publication statusPublished - 9 Oct 2020


  • astro-ph.CO


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