热门
Ongoing assembly of massive galaxies by major merging in large groups and clusters from the SDSS
文献类型：期刊论文
| 作者 | McIntosh, Daniel H.1; Guo, Yicheng1; Hertzberg, Jen1; Katz, Neal1; Mo, H. J.1; van den Bosch, Frank C.2; Yang, Xiaohu3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2008-08-21 |
| 卷号 | 388期号:4页码:1537-1556 |
| 关键词 | galaxies : clusters : general galaxies : evolution galaxies : formation galaxies : interactions |
| 英文摘要 | We investigate the incidence of major mergers creating massive (M(star) > 10(11) M(circle dot)) galaxies in present-day (z <= .12) groups and clusters. Using a volume-limited sample of 845 groups with dark matter halo masses above 2.5 x 10(13) M(circle dot), we isolate 221 galaxy pairs with <= 1.5 r-band magnitude differences, <= 30 kpc projected separations and combined masses above 10(11) M(circle dot). We fit the r-band images of each pair as the line-of-sight projection of symmetric models and identify 38 mergers by the presence of residual asymmetric structure associated with both progenitors, such as non-concentric isophotes, broad and diffuse tidal tails and dynamical friction wakes. In other words, at the resolution and sensitivity of the Sloan Digital Sky Survey (SDSS), 16 per cent of massive major pairs in dense environments have mutual tidal interaction signatures; relying on automated searches of major pairs from the SDSS spectroscopic galaxy sample will result in missing 70 per cent of these mergers owing to spectroscopic incompleteness in high-density regions. We find that 90 per cent of these mergers are between two nearly equal-mass progenitors with red-sequence colours and centrally concentrated morphologies, in agreement with numerical simulations that predict that an important mechanism for the formation of massive elliptical galaxies is the dissipationless (gas-poor or so-called dry) major merging of spheroid-dominated galaxies. We identify seven additional massive mergers with disturbed morphologies and semiresolved double nuclei; thus, 1.5 +/- 0.2 per cent of M(star) >= 5 x 10(10) M(circle dot) galaxies in large groups are involved in the major merger assembly of massive galaxies. Mergers at the centres of these groups are more common than between two satellites, but both types are morphologically indistinguishable and we tentatively conclude that the latter are likely located at the dynamical centres of large subhaloes that have recently been accreted by their host halo. Based on reasonable assumptions, the centres of group and cluster-sized haloes are gaining stellar mass at a rate of 2-9 per cent per Gyr on average. Our results indicate that the massive end of the galaxy population continues to evolve hierarchically at a measurable level, and that massive mergers are more likely to occur in large galaxy groups than in massive clusters. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; LUMINOUS RED GALAXIES ; SPECTROSCOPIC TARGET SELECTION ; MORPHOLOGY-DENSITY RELATION ; SUPERMASSIVE BLACK-HOLES ; LARGE-SCALE STRUCTURE ; SURVEY IMAGING DATA ; COLD DARK MATTER ; ELLIPTIC GALAXIES ; REDSHIFT SURVEY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000258222800008 |
| 源URL | [http://119.78.226.72/handle/331011/19338]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 2.Max Planck Inst Astron, D-69117 Heidelberg, Germany 3.Shanghai Astron Observ, Partner Grp MPA, Joint Inst Galaxy & Cosmol, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | McIntosh, Daniel H.,Guo, Yicheng,Hertzberg, Jen,et al. Ongoing assembly of massive galaxies by major merging in large groups and clusters from the SDSS[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,388(4):1537-1556. |
| APA | McIntosh, Daniel H..,Guo, Yicheng.,Hertzberg, Jen.,Katz, Neal.,Mo, H. J..,...&Yang, Xiaohu.(2008).Ongoing assembly of massive galaxies by major merging in large groups and clusters from the SDSS.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,388(4),1537-1556. |
| MLA | McIntosh, Daniel H.,et al."Ongoing assembly of massive galaxies by major merging in large groups and clusters from the SDSS".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 388.4(2008):1537-1556. |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。