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

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

doi:10.1111/j.1365-2966.2011.19217.x

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

A. S G Robotham^*, P. Norberg, S. P. Driver, I. K. Baldry, S. P. Bamford, A. M. Hopkins, J. Liske, J. Loveday, A. Merson, J. A. Peacock, S. Brough, E. Cameron, C. J. Conselice, S. M. Croom, C. S. Frenk, M. Gunawardhana, D. T. Hill, D. H. Jones, L. S. Kelvin, K. KuijkenR. C. Nichol, H. R. Parkinson, K. A. Pimbblet, S. Phillipps, C. C. Popescu, M. Prescott, R. G. Sharp, W. J. Sutherland, E. N. Taylor, D. Thomas, R. J. Tuffs, E. van Kampen, D. Wijesinghe

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

252 Citations (Scopus)

Abstract

Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142deg² tor_AB= 19.4, of which ∼47deg² is tor_AB= 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 matterN-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 14388 galaxy groups (with multiplicity ≥2), including 44186 galaxies out of a possible 110192 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

Original language	English
Pages (from-to)	2640-2668
Number of pages	29
Journal	Monthly Notices of the Royal Astronomical Society
Volume	416
Issue number	4
DOIs	https://doi.org/10.1111/j.1365-2966.2011.19217.x
Publication status	Published - Oct 2011
Externally published	Yes

Keywords

Dark matter
Galaxies: groups: general
Galaxies: haloes
Large-scale structure of Universe

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10.1111/j.1365-2966.2011.19217.x

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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, 416(4), 2640-2668. https://doi.org/10.1111/j.1365-2966.2011.19217.x

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. / Galaxy and Mass Assembly (GAMA) : The GAMA galaxy group catalogue (G³Cv1). In: Monthly Notices of the Royal Astronomical Society. 2011 ; Vol. 416, No. 4. pp. 2640-2668.

@article{470c8eff7d7a430f8fcb98a7fd519e74,

title = "Galaxy and Mass Assembly (GAMA): The GAMA galaxy group catalogue (G3Cv1)",

abstract = "Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142deg2 torAB= 19.4, of which ∼47deg2 is torAB= 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 matterN-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 14388 galaxy groups (with multiplicity ≥2), including 44186 galaxies out of a possible 110192 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",

keywords = "Dark matter, Galaxies: groups: general, Galaxies: haloes, Large-scale structure of Universe",

author = "Robotham, {A. S G} and P. Norberg and Driver, {S. P.} and Baldry, {I. K.} and Bamford, {S. P.} and Hopkins, {A. M.} and J. Liske and J. Loveday and A. Merson and Peacock, {J. A.} and S. Brough and E. Cameron and Conselice, {C. J.} and Croom, {S. M.} and Frenk, {C. S.} and M. Gunawardhana and Hill, {D. T.} and Jones, {D. H.} and Kelvin, {L. S.} and K. Kuijken and Nichol, {R. C.} and Parkinson, {H. R.} and Pimbblet, {K. A.} and S. Phillipps and Popescu, {C. C.} and M. Prescott and Sharp, {R. G.} and Sutherland, {W. J.} and Taylor, {E. N.} and D. Thomas and Tuffs, {R. J.} and {van Kampen}, E. and D. Wijesinghe",

year = "2011",

month = oct,

doi = "10.1111/j.1365-2966.2011.19217.x",

language = "English",

volume = "416",

pages = "2640--2668",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

issn = "1745-3925",

publisher = "Oxford University Press",

number = "4",

}

Robotham, ASG, Norberg, P, Driver, SP, Baldry, IK, Bamford, SP, Hopkins, AM, Liske, J, Loveday, J, Merson, A, Peacock, JA, Brough, S, Cameron, E, Conselice, CJ, Croom, SM, Frenk, CS, Gunawardhana, M, Hill, DT, Jones, DH, Kelvin, LS, Kuijken, K, Nichol, RC, Parkinson, HR, Pimbblet, KA, Phillipps, S, Popescu, CC, Prescott, M, Sharp, RG, Sutherland, WJ, Taylor, EN, Thomas, D, Tuffs, RJ, van Kampen, E & Wijesinghe, D 2011, 'Galaxy and Mass Assembly (GAMA): The GAMA galaxy group catalogue (G³Cv1)', Monthly Notices of the Royal Astronomical Society, vol. 416, no. 4, pp. 2640-2668. https://doi.org/10.1111/j.1365-2966.2011.19217.x

Galaxy and Mass Assembly (GAMA) : The GAMA galaxy group catalogue (G³Cv1). / 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.

In: Monthly Notices of the Royal Astronomical Society, Vol. 416, No. 4, 10.2011, p. 2640-2668.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Galaxy and Mass Assembly (GAMA)

T2 - The GAMA galaxy group catalogue (G3Cv1)

AU - Robotham, A. S G

AU - Norberg, P.

AU - Driver, S. P.

AU - Baldry, I. K.

AU - Bamford, S. P.

AU - Hopkins, A. M.

AU - Liske, J.

AU - Loveday, J.

AU - Merson, A.

AU - Peacock, J. A.

AU - Brough, S.

AU - Cameron, E.

AU - Conselice, C. J.

AU - Croom, S. M.

AU - Frenk, C. S.

AU - Gunawardhana, M.

AU - Hill, D. T.

AU - Jones, D. H.

AU - Kelvin, L. S.

AU - Kuijken, K.

AU - Nichol, R. C.

AU - Parkinson, H. R.

AU - Pimbblet, K. A.

AU - Phillipps, S.

AU - Popescu, C. C.

AU - Prescott, M.

AU - Sharp, R. G.

AU - Sutherland, W. J.

AU - Taylor, E. N.

AU - Thomas, D.

AU - Tuffs, R. J.

AU - van Kampen, E.

AU - Wijesinghe, D.

PY - 2011/10

Y1 - 2011/10

N2 - Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142deg2 torAB= 19.4, of which ∼47deg2 is torAB= 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 matterN-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 14388 galaxy groups (with multiplicity ≥2), including 44186 galaxies out of a possible 110192 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

AB - Using the complete Galaxy and Mass Assembly I (GAMA-I) survey covering ∼142deg2 torAB= 19.4, of which ∼47deg2 is torAB= 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 matterN-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 14388 galaxy groups (with multiplicity ≥2), including 44186 galaxies out of a possible 110192 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

KW - Dark matter

KW - Galaxies: groups: general

KW - Galaxies: haloes

KW - Large-scale structure of Universe

UR - http://www.scopus.com/inward/record.url?scp=80052964314&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2011.19217.x

DO - 10.1111/j.1365-2966.2011.19217.x

M3 - Article

AN - SCOPUS:80052964314

VL - 416

SP - 2640

EP - 2668

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 4

ER -

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

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