Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations

P. R. Kafle, A. S. G. Robotham, C. del P. Lagos , L. J. Davies, A. J. Moffett, S. P. Driver, S. K. Andrews, Ivan K. Baldry, J. Bland-Hawthorn, S. Brough, L. Cortese, Michael J. Drinkwater, R. Finnegan, A. M. Hopkins, J. Loveday

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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 languageEnglish
Pages (from-to)4194-4209
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number4
Early online date12 Sep 2016
DOIs
Publication statusPublished - 21 Dec 2016

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galactic clusters
stellar mass
assembly
galaxies
prediction
predictions
halos
simulation
probe
probes
radial distribution
catalogs
luminosity
gradients
radii
causes
estimates

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Kafle, P. R. ; Robotham, A. S. G. ; del P. Lagos , C. ; Davies, L. J. ; Moffett, A. J. ; Driver, S. P. ; Andrews, S. K. ; Baldry, Ivan K. ; Bland-Hawthorn, J. ; Brough, S. ; Cortese, L. ; Drinkwater, Michael J. ; Finnegan, R. ; Hopkins, A. M. ; Loveday, J. / Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 463, No. 4. pp. 4194-4209.
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title = "Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations",
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.",
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author = "Kafle, {P. R.} and Robotham, {A. S. G.} and {del P. Lagos}, C. and Davies, {L. J.} and Moffett, {A. J.} and Driver, {S. P.} and Andrews, {S. K.} and Baldry, {Ivan K.} and J. Bland-Hawthorn and S. Brough and L. Cortese and Drinkwater, {Michael J.} and R. Finnegan and Hopkins, {A. M.} and J. Loveday",
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Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations. / Kafle, P. R.; Robotham, A. S. G.; del P. Lagos , C.; Davies, L. J.; Moffett, A. J.; Driver, S. P.; Andrews, S. K.; Baldry, Ivan K.; Bland-Hawthorn, J.; Brough, S.; Cortese, L.; Drinkwater, Michael J.; Finnegan, R.; Hopkins, A. M.; Loveday, J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 463, No. 4, 21.12.2016, p. 4194-4209.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Galaxy And Mass Assembly (GAMA): the absence of stellar mass segregation in galaxy groups and consistent predictions from GALFORM and EAGLE simulations

AU - Kafle, P. R.

AU - Robotham, A. S. G.

AU - del P. Lagos , C.

AU - Davies, L. J.

AU - Moffett, A. J.

AU - Driver, S. P.

AU - Andrews, S. K.

AU - Baldry, Ivan K.

AU - Bland-Hawthorn, J.

AU - Brough, S.

AU - Cortese, L.

AU - Drinkwater, Michael J.

AU - Finnegan, R.

AU - Hopkins, A. M.

AU - Loveday, J.

PY - 2016/12/21

Y1 - 2016/12/21

N2 - 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.

AB - 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.

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: haloes

KW - galaxies: groups: general

U2 - 10.1093/mnras/stw2290

DO - 10.1093/mnras/stw2290

M3 - Article

VL - 463

SP - 4194

EP - 4209

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -