THE HALO MASS FUNCTION CONDITIONED ON DENSITY FROM THE MILLENNIUM SIMULATION: INSIGHTS INTO MISSING BARYONS AND GALAXY MASS FUNCTIONS
文献类型：期刊论文
| 作者 | Faltenbacher, A.1,2,3; Finoguenov, A.4,5; Drory, N.4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2010-03-20 |
| 卷号 | 712期号:1页码:484-493 |
| 关键词 | galaxies: groups: general large-scale structure of universe methods: numerical |
| 英文摘要 | The baryon content of high-density regions in the universe is relevant to two critical unanswered questions: the workings of nurture effects on galaxies and the whereabouts of the missing baryons. In this paper, we analyze the distribution of dark matter and semianalytical galaxies in the Millennium Simulation to investigate these problems. Applying the same density field reconstruction schemes as used for the overall matter distribution to the matter locked in halos, we study the mass contribution of halos to the total mass budget at various background field densities, i.e., the conditional halo mass function. In this context, we present a simple fitting formula for the cumulative mass function accurate to less than or similar to 5% for halo masses between 10(10) and 10(15) h(-1) M(circle dot). We find that in dense environments the halo mass function becomes top heavy and present corresponding fitting formulae for different redshifts. We demonstrate that the major fraction of matter in high-density fields is associated with galaxy groups. Since current X-ray surveys are able to nearly recover the universal baryon fraction within groups, our results indicate that the major part of the so-far undetected warm-hot intergalactic medium resides in low-density regions. Similarly, we show that the differences in galaxy mass functions with environment seen in observed and simulated data stem predominantly from differences in the mass distribution of halos. In particular, the hump in the galaxy mass function is associated with the central group galaxies, and the bimodality observed in the galaxy mass function is therefore interpreted as that of central galaxies versus satellites. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DARK-MATTER HALOES ; EXCURSION SET MODEL ; STELLAR MASS ; HIGH-REDSHIFT ; SKY SURVEY ; CLUSTERS ; EVOLUTION ; ENVIRONMENT ; FIELD ; GAS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000275222900043 |
| 源URL | [http://119.78.226.72/handle/331011/26364]  |
| 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-85741 Garching, Germany 2.Shanghai Astron Observ, MPA SHAO Joint Ctr Astrophys Cosmol, Shanghai 200030, Peoples R China 3.Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa 4.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany 5.Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA |
| 推荐引用方式 GB/T 7714 | Faltenbacher, A.,Finoguenov, A.,Drory, N.. THE HALO MASS FUNCTION CONDITIONED ON DENSITY FROM THE MILLENNIUM SIMULATION: INSIGHTS INTO MISSING BARYONS AND GALAXY MASS FUNCTIONS[J]. ASTROPHYSICAL JOURNAL,2010,712(1):484-493. |
| APA | Faltenbacher, A.,Finoguenov, A.,&Drory, N..(2010).THE HALO MASS FUNCTION CONDITIONED ON DENSITY FROM THE MILLENNIUM SIMULATION: INSIGHTS INTO MISSING BARYONS AND GALAXY MASS FUNCTIONS.ASTROPHYSICAL JOURNAL,712(1),484-493. |
| MLA | Faltenbacher, A.,et al."THE HALO MASS FUNCTION CONDITIONED ON DENSITY FROM THE MILLENNIUM SIMULATION: INSIGHTS INTO MISSING BARYONS AND GALAXY MASS FUNCTIONS".ASTROPHYSICAL JOURNAL 712.1(2010):484-493. |
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。