Satellites and haloes of dwarf galaxies
文献类型：期刊论文
| 作者 | Sales, Laura V.1; Wang, Wenting1,2; White, Simon D. M.1; Navarro, Julio F.3 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013 |
| 卷号 | 428期号:1页码:573-578 |
| 关键词 | galaxies: dwarf galaxies: formation galaxies: haloes |
| 英文摘要 | We study the abundance of satellite galaxies as a function of primary stellar mass using the Sloan Digital Sky Survey/Data Release 7 (SDSS/DR7) spectroscopic catalogue. In contrast with previous studies, which focused mainly on bright primaries, our central galaxies span a wide range of stellar mass, 10(7.5) <= M-*(pri)/M-circle dot <= 10(11), from dwarfs to central cluster galaxies. Our analysis confirms that the average number of satellites around bright primaries, when expressed in terms of satellite-to-primary stellar mass ratio (m(*)(sat)/M-*(pri)), is a strong function of M-*(pri). On the other hand, satellite abundance is largely independent of primary mass for dwarf primaries (M-*(pri) < 10(10) M-circle dot). These results are consistent with galaxy formation models in the Lambda cold dark matter (Lambda CDM) scenario. We find excellent agreement between SDSS data and semianalytic mock galaxy catalogues constructed from the Millennium-II Simulation. Satellite galaxies trace dark matter substructure in Lambda CDM, so satellite abundance reflects the dependence on halo mass, M-200, of both substructure and galaxy stellar mass (M-*). Since dark matter substructure is almost scale free, the dependence of satellite abundance on primary mass results solely from the well-defined characteristic mass in the galaxy mass-halo mass relation. On dwarf galaxy scales, where models predict a power-law scaling, M-* proportional to M-200(2.5), similarity is preserved and satellite abundance is independent of primary mass. For primaries brighter than the characteristic mass of the M-*-M-200 relation, satellite abundance increases strongly with primary mass. Our results provide strong support for the steep, approximately power-law dependence of dwarf galaxy mass on halo mass envisioned in Lambda CDM galaxy formation models. |
| 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 ; DARK-MATTER HALOES ; STELLAR MASS ; LAMBDA-CDM ; OCCUPATION DISTRIBUTION ; MAGELLANIC CLOUDS ; SPIRAL GALAXIES ; EVOLUTION ; SDSS ; SUBSTRUCTURE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000318227900055 |
| 源URL | [http://119.78.226.72/handle/331011/18071]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Max Planck Inst Astrophys, D-85740 Garching, Germany 2.Chinese Acad Sci, Max Planck Inst Partner Grp, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 3.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada |
| 推荐引用方式 GB/T 7714 | Sales, Laura V.,Wang, Wenting,White, Simon D. M.,et al. Satellites and haloes of dwarf galaxies[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,428(1):573-578. |
| APA | Sales, Laura V.,Wang, Wenting,White, Simon D. M.,&Navarro, Julio F..(2013).Satellites and haloes of dwarf galaxies.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,428(1),573-578. |
| MLA | Sales, Laura V.,et al."Satellites and haloes of dwarf galaxies".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 428.1(2013):573-578. |
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来源：上海天文台
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