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Cited by 379

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Galaxy and Mass Assembly (GAMA): the GAMA galaxy group catalogue (G3Cv1)

Open access
Robotham, A. S. G., Norberg, P., Driver, S. P., Baldry, I. K., Bamford, S. P., Hopkins, A. M., Liske, J., Loveday, J., Merson, A., Peacock, J. A., Brough, S., Cameron, E., Conselice, C. J., Croom, S. M., Frenk, C. S., Gunawardhana, M., Hill, D. T., Jones, D. H., Kelvin, L. S., Kuijken, K., Nichol, R. C., Parkinson, H. R., Pimbblet, K. A., Phillipps, S., Popescu, C. C., Prescott, M., Sharp, R. G., Sutherland, W. J., Taylor, E. N., Thomas, D., Tuffs, R. J., van Kampen, E., Wijesinghe, D.·2011·Monthly Notices of the Royal Astronomical Society

Abstract

Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142 deg2 to rAB= 19.4, of which ∼47 deg2 is to rAB= 19.8, we create the GAMA-I galaxy group catalogue (G3Cv1), generated using a friends-of-friends (FoF) based grouping algorithm. Our algorithm has been tested extensively on one family of mock GAMA lightcones, constructed from Λ cold dark matter N-body simulations populated with semi-analytic galaxies. Recovered group properties are robust to the effects of interlopers and are median unbiased in the most important respects. G3Cv1 contains 14 388 galaxy groups (with multiplicity ≥2), including 44 186 galaxies out of a possible 110 192 galaxies, implying ∼40 per cent of all galaxies are assigned to a group. The similarities of the mock group catalogues and G3Cv1 are multiple: global characteristics are in general well recovered. However, we do find a noticeable deficit in the number of high multiplicity groups in GAMA compared to the mocks. Additionally, despite exceptionally good local spatial completeness, G3Cv1 contains significantly fewer compact groups with five or more members, this effect becoming most evident for high multiplicity systems. These two differences are most likely due to limitations in the physics included of the current GAMA lightcone mock. Further studies using a variety of galaxy formation models are required to confirm their exact origin. The G3Cv1 catalogue will be made publicly available as and when the relevant GAMA redshifts are made available at http://www.gama-survey.org.

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Metadata

Authors
Robotham, A. S. G., Norberg, P., Driver, S. P., Baldry, I. K., Bamford, S. P., Hopkins, A. M., Liske, J., Loveday, J., Merson, A., Peacock, J. A., Brough, S., Cameron, E., Conselice, C. J., Croom, S. M., Frenk, C. S., Gunawardhana, M., Hill, D. T., Jones, D. H., Kelvin, L. S., Kuijken, K., Nichol, R. C., Parkinson, H. R., Pimbblet, K. A., Phillipps, S., Popescu, C. C., Prescott, M., Sharp, R. G., Sutherland, W. J., Taylor, E. N., Thomas, D., Tuffs, R. J., van Kampen, E., & Wijesinghe, D.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2011-07-26
Volume
416
Issue
4
Pages
2640-2668
ISSN
0035-8711 (ISSN-L)
OpenAlex
W1647544099
Cited by
379
References
37
FWCI
7.95
Type
journal article
Language
en
Open access
bronze

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The paper
Robotham, A. S. G., Norberg, P., Driver, S. P., Baldry, I. K., Bamford, S. P., Hopkins, A. M., Liske, J., Loveday, J., Merson, A., Peacock, J. A., Brough, S., Cameron, E., Conselice, C. J., Croom, S. M., Frenk, C. S., Gunawardhana, M., Hill, D. T., Jones, D. H., Kelvin, L. S., . . . Wijesinghe, D. (2011). Galaxy and Mass Assembly (GAMA): the GAMA galaxy group catalogue (G3Cv1). Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2011.19217.x

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