INTERACTING GALAXIES IN THE A901/902 SUPERCLUSTER WITH STAGES

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 星系中的恒星形成研究团组

	INTERACTING GALAXIES IN THE A901/902 SUPERCLUSTER WITH STAGES
	Heiderman, Amanda 1; Jogee, Shardha 1; Marinova, Irina 1; van Kampen, Eelco 2,3; Barden, Marco 2; Peng, Chien Y.4,5; Heymans, Catherine 6; Gray, Meghan E.7; Bell, Eric F.8; Bacon, David 9
刊名	ASTROPHYSICAL JOURNAL
	2009-11-10
卷号	705 期号:2 页码:1433-1455
关键词	galaxies: clusters: general galaxies: clusters: individual (A901, A902) galaxies: evolution galaxies: formation galaxies: interactions galaxies: structure
ISSN号	0004-637X
英文摘要	We present a study of galaxy mergers and the influence of environment in the Abell 901/902 supercluster at z similar to 0.165, based on 893 bright (R(Vega) <= 24) intermediate-mass (M() >= 10(9) M(circle dot)) galaxies. We use HST ACS F606W data from the Space Telescope A901/902 Galaxy Evolution Survey, COMBO-17, Spitzer 24 mu m, and XMM-Newton X-ray data. Our analysis utilizes both a physically driven visual classification system and quantitative CAS parameters to identify systems which show evidence of a recent or ongoing merger of mass ratio >1/10 (i.e., major and minor mergers). Our results are (1) after visual classification and minimizing the contamination from false projection pairs, we find that the merger fraction f(merge) is 0.023 +/- 0.007. The estimated fractions of likely major mergers, likely minor mergers, and ambiguous cases are 0.01 +/- 0.004, 0.006 +/- 0.003, and 0.007 +/- 0.003, respectively. (2) All the mergers lie outside the cluster core of radius R < 0.25 Mpc: the lack of mergers in the core is likely due to the large galaxy velocity dispersion in the core. The mergers, instead, populate the region (0.25 Mpc < R <= 2 Mpc) between the core and the cluster outskirt. In this region, the estimated frequency of mergers is similar to those seen at typical group overdensities in N-body simulations of accreting groups in the A901/902 clusters. This suggests the ongoing growth of the clusters via accretion of group and field galaxies. (3) We compare our observed merger fraction with those reported in other clusters and groups out to z similar to 0.4. Existing data points on the merger fraction for L <= L galaxies in clusters allow for a wide spectrum of scenarios, ranging from no evolution to evolution by a factor of similar to 5 over z similar to 0.17-0.4. (4) In A901/902, the fraction of interacting galaxies, which lie on the blue cloud is 80% +/- 18% (16/20) versus 34% +/- 7% or (294/866) for non-interacting galaxies, implying that interacting galaxies are preferentially blue. (5) The average star formation rate (SFR), based on UV or a combination of UV+IR data, is enhanced by a factor of similar to 1.5-2 in mergers compared to non-interacting galaxies. However, mergers in the A901/902 clusters contribute only a small fraction (between 10% and 15%) of the total SFR density, while the rest of the SFR density comes from non-interacting galaxies.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MORPHOLOGY-DENSITY RELATION ; CLUSTER SPIRAL GALAXIES ; HUBBLE-SPACE-TELESCOPE ; INITIAL MASS FUNCTION ; DIGITAL SKY SURVEY ; LAST 7 GYR ; STAR-FORMATION ; DARK-MATTER ; VIRGO CLUSTER ; DISTANT GALAXIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000271149700030
公开日期	2011-12-08
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1579]
专题	紫金山天文台_星系中的恒星形成研究团组
作者单位	1.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 2.Univ Innsbruck, Inst Astro & Particle Phys, A-6020 Innsbruck, Austria 3.ESO, D-85748 Garching, Germany 4.NRC Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada 5.Space Telescope Sci Inst, Baltimore, MD 21218 USA 6.Univ Edinburgh, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland 7.Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England 8.Max Planck Inst Astron, D-69117 Heidelberg, Germany 9.Univ Portsmouth, Inst Cosmol & Gravitat, Portsmouth PO1 3FX, Hants, England 10.Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada
推荐引用方式 GB/T 7714	Heiderman, Amanda,Jogee, Shardha,Marinova, Irina,et al. INTERACTING GALAXIES IN THE A901/902 SUPERCLUSTER WITH STAGES[J]. ASTROPHYSICAL JOURNAL,2009,705(2):1433-1455.
APA	Heiderman, Amanda.,Jogee, Shardha.,Marinova, Irina.,van Kampen, Eelco.,Barden, Marco.,...&Zheng, Xianzhong.(2009).INTERACTING GALAXIES IN THE A901/902 SUPERCLUSTER WITH STAGES.ASTROPHYSICAL JOURNAL,705(2),1433-1455.
MLA	Heiderman, Amanda,et al."INTERACTING GALAXIES IN THE A901/902 SUPERCLUSTER WITH STAGES".ASTROPHYSICAL JOURNAL 705.2(2009):1433-1455.