FOSSIL EVIDENCE FOR THE TWO-PHASE FORMATION OF ELLIPTICAL GALAXIES
文献类型：期刊论文
| 作者 | Huang, Song1,2,3; Ho, Luis C.2; Peng, Chien Y.4; Li, Zhao-Yu5; Barth, Aaron J.6 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2013-05-10 |
| 卷号 | 768期号:2页码:28 |
| 关键词 | galaxies: evolution galaxies: photometry galaxies: structure |
| 英文摘要 | Massive early-type galaxies (ETGs) have undergone dramatic structural evolution over the last 10 Gyr. A companion paper shows that nearby elliptical galaxies with M-* >= 1.3 x 10(11) M-circle dot generically contain three photometric subcomponents: a compact inner component with effective radius R-e less than or similar to 1 kpc, an intermediate-scale middle component with R-e approximate to 2.5 kpc, and an extended outer envelope with R-e approximate to 10 kpc. Here we attempt to relate these substructures with the properties of ETGs observed at higher redshifts. We find that a hypothetical structure formed from combining the inner and middle components of local ellipticals follows a strikingly tight stellar mass-size relation, one that resembles the distribution of ETGs at z approximate to 1. Outside of the central kpc, the median stellar mass surface density profiles of this composite structure agree closest with those of massive galaxies that have similar cumulative number density at 1.5 < z < 2.0 within the uncertainty. We propose that the central substructures in nearby ellipticals are the evolutionary descendants of the "red nuggets" formed under highly dissipative ("wet") conditions at high redshifts, as envisioned in the initial stages of the two-phase formation scenario recently advocated for massive galaxies. Subsequent accretion, plausibly through dissipationless ("dry") minor mergers, builds the outer regions of the galaxy identified as the outer envelope in our decomposition. The large scatter exhibited by this component on the stellar mass-size plane testifies to the stochastic nature of the accretion events. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | GOODS NICMOS SURVEY ; SIMILAR-TO 2 ; COMPACT MASSIVE GALAXIES ; HIGH-REDSHIFT GALAXIES ; INSIDE-OUT GROWTH ; QUIESCENT GALAXIES ; SIZE EVOLUTION ; ASSEMBLY HISTORIES ; STAR-FORMATION ; EXTRA LIGHT |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000318347700005 |
| 公开日期 | 2015-01-26 |
| 源URL | [http://119.78.226.72//handle/331011/15427]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 2.Observ Carnegie Inst Sci, Pasadena, CA 91101 USA 3.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 4.Giant Magellan Telescope Org, Pasadena, CA 91101 USA 5.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 6.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA |
| 推荐引用方式 GB/T 7714 | Huang, Song,Ho, Luis C.,Peng, Chien Y.,et al. FOSSIL EVIDENCE FOR THE TWO-PHASE FORMATION OF ELLIPTICAL GALAXIES[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,768(2):28. |
| APA | Huang, Song,Ho, Luis C.,Peng, Chien Y.,Li, Zhao-Yu,&Barth, Aaron J..(2013).FOSSIL EVIDENCE FOR THE TWO-PHASE FORMATION OF ELLIPTICAL GALAXIES.ASTROPHYSICAL JOURNAL LETTERS,768(2),28. |
| MLA | Huang, Song,et al."FOSSIL EVIDENCE FOR THE TWO-PHASE FORMATION OF ELLIPTICAL GALAXIES".ASTROPHYSICAL JOURNAL LETTERS 768.2(2013):28. |
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