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Abstract
We investigate the contentious issue of the presence, or lack thereof,
of satellites mass segregation in galaxy groups using the Galaxy And
Mass Assembly (GAMA) survey, the GALFORM semi-analytic, and the EAGLE
cosmological hydrodynamical simulation catalogues of galaxy groups. We
select groups with halo mass 12 ≤ log
(Mhalo/h-1 M⊙) <14.5 and
redshift z ≤ 0.32 and probe the radial distribution of stellar mass
out to twice the group virial radius. All the samples are carefully
constructed to be complete in stellar mass at each redshift range and
efforts are made to regularize the analysis for all the data. Our study
shows negligible mass segregation in galaxy group environments with
absolute gradients of ≲0.08 dex and also shows a lack of any
redshift evolution. Moreover, we find that our results at least for the
GAMA data are robust to different halo mass and group centre estimates.
Furthermore, the EAGLE data allows us to probe much fainter luminosities
(r-band magnitude of 22) as well as investigate the three-dimensional
spatial distribution with intrinsic halo properties, beyond what the
current observational data can offer. In both cases we find that the
fainter EAGLE data show a very mild spatial mass segregation at z ≤
0.22, which is again not apparent at higher redshift. Interestingly, our
results are in contrast to some earlier findings using the Sloan Digital
Sky Survey. We investigate the source of the disagreement and suggest
that subtle differences between the group-finding algorithms could be
the root cause.
Original language | English |
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Pages (from-to) | 4194-4209 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 463 |
Issue number | 4 |
Early online date | 12 Sep 2016 |
DOIs | |
Publication status | Published - 21 Dec 2016 |
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Dive into the research topics of 'Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations'. Together they form a unique fingerprint.Projects
- 1 Finished
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How typical is our Local Galaxy Group?
Robotham, A., Driver, S. & Drinkwater, M.
1/01/14 → 31/08/17
Project: Research