|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
18 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Strong bimodality in the host halo mass of central galaxies from galaxy-galaxy lensing | | Rachel Mandelbaum
; Wenting Wang
; Ying Zu
; Simon White
; Bruno Henriques
; Surhud More
; | | Date: |
22 Sep 2015 | | Abstract: | We use galaxy-galaxy lensing to study the dark matter halos surrounding a
sample of Locally Brightest Galaxies (LBGs) selected from the Sloan Digital Sky
Survey. We measure mean halo mass as a function of the stellar mass and colour
of the central galaxy. Mock catalogues constructed from semi-analytic galaxy
formation simulations demonstrate that most LBGs are the central objects of
their halos, greatly reducing interpretation uncertainties due to satellite
contributions to the lensing signal. Over the full stellar mass range, $10.3 <
log M_*/M_odot < 11.6$, we find that passive central galaxies have halos that
are at least twice as massive as those of star-forming objects of the same
stellar mass. The significance of this effect exceeds $3sigma$ for $log
M_*/M_odot > 10.7$. Tests using the mock catalogues and on the data themselves
clarify the effects of LBG selection and show that it cannot artificially
induce a systematic dependence of halo mass on LBG colour. The bimodality in
halo mass at fixed stellar mass is reproduced by the astrophysical model
underlying our mock catalogue, but the sign of the effect is inconsistent with
recent, nearly parameter-free age-matching models. The sign and magnitude of
the effect can, however, be reproduced by halo occupation distribution models
with a simple (few-parameter) prescription for type-dependence. | | Source: | arXiv, 1509.6762 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER