Galaxy And Mass Assembly (GAMA): the life and times of L-star galaxies

Robotham, A. S. G., Liske, J., Driver, S. P., Sansom, A. E., Baldry, I. K., Bauer, A. E., Bland-Hawthorn, J., Brough, S., Brown, M. J. I., Colless, M., Christodoulou, L., Drinkwater, M. J., Grootes, M. W., Hopkins, A. M., Kelvin, L. S., Norberg, P., Loveday, J., Phillipps, S., Sharp, R., Taylor, E. N. and Tuffs, R. J. (2013) Galaxy And Mass Assembly (GAMA): the life and times of L-star galaxies. Monthly Notices of the Royal Astronomical Society, 431 1: 167-193. doi:10.1093/mnras/stt156


Author Robotham, A. S. G.
Liske, J.
Driver, S. P.
Sansom, A. E.
Baldry, I. K.
Bauer, A. E.
Bland-Hawthorn, J.
Brough, S.
Brown, M. J. I.
Colless, M.
Christodoulou, L.
Drinkwater, M. J.
Grootes, M. W.
Hopkins, A. M.
Kelvin, L. S.
Norberg, P.
Loveday, J.
Phillipps, S.
Sharp, R.
Taylor, E. N.
Tuffs, R. J.
Title Galaxy And Mass Assembly (GAMA): the life and times of L-star galaxies
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2013-05-01
Year available 2013
Sub-type Article (original research)
DOI 10.1093/mnras/stt156
Open Access Status DOI
Volume 431
Issue 1
Start page 167
End page 193
Total pages 27
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2014
Language eng
Formatted abstract
In this work, we investigate in detail the effects the local environment (groups and pairs) has on galaxies with stellar mass similar to the MilkyWay (L* galaxies). A volume limited sample of 6150 galaxies are visually classified to determine the emission features, morphological type and presence of a disc. This large sample allows for the significant characteristics of galaxies to be isolated (e.g. stellar mass and group halo mass), and their codependencies determined. We observe that galaxy-galaxy interactions play the most important role in shaping the evolutionwithin a group halo; themain role of halomass is in gathering the galaxies together to encourage such interactions. Dominant pair galaxies find their overall star formation enhanced when the pair's mass ratio is close to 1; otherwise, we observe the same galaxies as we would in an unpaired system. The minor galaxy in a pair is greatly affected by its companion galaxy, and while the star-forming fraction is always suppressed relative to equivalent stellar mass unpaired galaxies, it becomes lower still when the mass ratio of a pair system increases. We find that, in general, the close galaxy-galaxy interaction rate drops as a function of halo mass for a given amount of stellar mass. We find evidence of a local peak of interactions for Milky Way stellar mass galaxies in Milky Way halo mass groups. Low-mass haloes, and in particular Local Group mass haloes, are an important environment for understanding the typical evolutionary path of a unit of stellar mass. We find compelling evidence for galaxy conformity in both groups and pairs, where morphological type conformity is dominant in groups, and emission class conformity is dominant in pairs. This suggests that group scale conformity is the result of many galaxy encounters. over an extended period of time, while pair conformity is a fairly instantaneous response to a transitory interaction.
Keyword large scale structure of Universe
Digital Sky Survey
Milky Way
Luminosity Function
Spiral Galaxies
Stellar Mass
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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