Galaxy And Mass Assembly (GAMA): estimating galaxy group masses via caustic analysis

被引：21

作者：

Alpaslan, Mehmet ^{[1
,2
]}

Robotham, Aaron S. G. ^{[1
,2
]}

Driver, Simon ^{[1
,2
]}

Norberg, Peder ^{[3
]}

Peacock, John A. ^{[4
]}

Baldry, Ivan ^{[5
]}

Bland-Hawthorn, Joss ^{[6
]}

Brough, Sarah ^{[7
]}

Hopkins, Andrew M. ^{[8
]}

Kelvin, Lee S. ^{[1
,2
]}

Liske, Jochen ^{[7
]}

Loveday, Jon ^{[9
]}

Merson, Alexander ^{[3
]}

Nichol, Robert C. ^{[10
]}

Pimbblet, Kevin ^{[11
]}

机构：

[1] Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[2] Univ Western Australia, Int Ctr Radio Astron Res, Perth, WA 6009, Australia

[3] Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England

[4] Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland

[5] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[6] Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia

[7] European So Observ, D-85748 Garching, Germany

[8] Australian Astron Observ, Epping, NSW 1710, Australia

[9] Univ Sussex, Ctr Astron, Brighton BN1 9QH, E Sussex, England

[10] Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England

[11] Monash Univ, Sch Phys, Melbourne, Vic 3800, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 426卷 / 04期

关键词：

galaxies: groups: general; galaxies: haloes; dark matter; large-scale structure of Universe; INFALL PATTERNS; CLUSTER; REGIONS; EVOLUTION; SCALE;

D O I：

10.1111/j.1365-2966.2012.21020.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have generated complementary halo mass estimates for all the groups in the Galaxy And Mass Assembly Galaxy Group Catalogue (GAMA G3Cv1) using a modified caustic mass estimation algorithm, originally developed by Diaferio & Geller. We calibrate the algorithm by applying it on a series of nine GAMA mock galaxy light cones and investigate the effects of using different definitions for group centre and size. We select the set of parameters that provide median-unbiased mass estimates when tested on mocks, and generate mass estimates for the real group catalogue. We find that on average, the caustic mass estimates agree with dynamical mass estimates within a factor of 2 in 90.8 +/- 6.1 per cent groups and compare equally well to velocity dispersion based mass estimates for both high- and low-multiplicity groups over the full range of masses probed by the G3Cv1.

引用

页码：2832 / 2846

页数：15

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