The dependence of halo mass on galaxy size at fixed stellar mass using weak lensing
| Autor: | Paul J. L. Charlton, Michael J. Hudson, Michael L. Balogh, Sumeet Khatri |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
010308 nuclear & particles physics FOS: Physical sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy merger Astrophysics - Astrophysics of Galaxies 01 natural sciences Peculiar galaxy Dark matter halo Galactic halo Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Galaxy group 0103 physical sciences Galaxy formation and evolution Astrophysics::Solar and Stellar Astrophysics Disc 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy rotation curve |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 472:2367-2387 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stx2068 |
| Popis: | Stellar mass has been shown to correlate with halo mass, with non-negligible scatter. The stellar mass-size and luminosity-size relationships of galaxies also show significant scatter in galaxy size at fixed stellar mass. It is possible that, at fixed stellar mass and galaxy colour, the halo mass is correlated with galaxy size. Galaxy-galaxy lensing allows us to measure the mean masses of dark matter haloes for stacked samples of galaxies. We extend the analysis of the galaxies in the CFHTLenS catalogue by fitting single S\'{e}rsic surface brightness profiles to the lens galaxies in order to recover half-light radius values, allowing us to determine halo masses for lenses according to their size. Comparing our halo masses and sizes to baselines for that stellar mass yields a differential measurement of the halo mass-galaxy size relationship at fixed stellar mass, defined as $M_{h}(M_{*}) \propto r_{\mathrm{eff}}^{\eta}(M_{*})$. We find that on average, our lens galaxies have an $\eta = 0.42\pm0.12$, i.e. larger galaxies live in more massive dark matter haloes. The $\eta$ is strongest for high mass luminous red galaxies (LRGs). Investigation of this relationship in hydrodynamical simulations suggests that, at a fixed $M_{*}$, satellite galaxies have a larger $\eta$ and greater scatter in the $M_{\mathrm{h}}$ and $r_{\mathrm{eff}}$ relationship compared to central galaxies. Comment: 23 pages, 16 figures |
| Databáze: | OpenAIRE |
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