A new X-ray-selected sample of very extended galaxy groups from the ROSAT All-Sky Survey
文献类型：期刊论文
| 作者 | Xu, Weiwei1,2,3 ; Ramos-Ceja, Miriam E.3; Pacaud, Florian3; Reiprich, Thomas H.3; Erben, Thomas3
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| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2018-11-20 |
| 卷号 | 619页码:17 |
| 关键词 | galaxies: clusters: general galaxies: groups: general galaxies: clusters: intracluster medium large-scale structure of Universe X-rays: galaxies: clusters |
| ISSN号 | 1432-0746 |
| DOI | 10.1051/0004-6361/201833062 |
| 英文摘要 | Context. Some indications for tension have long been identified between cosmological constraints obtained from galaxy clusters and primary cosmic microwave background (CMB) measurements. Typically, assuming the matter density and fluctuations, as parameterized with Omega(m) and sigma(8), estimated from CMB measurements, many more clusters are expected than those actually observed. This has been reinforced recently by the Planck collaboration. One possible explanation could be that certain types of galaxy groups or clusters were missed in samples constructed in previous surveys, resulting in a higher incompleteness than estimated. Aims. In this work, we aim to determine if a hypothetical class of very extended, low-surface-brightness galaxy groups or clusters have been missed in previous X-ray cluster surveys based on the ROSAT All-Sky Survey (RASS). Methods. We applied a dedicated source-detection algorithm sensitive also to more unusual group or cluster surface-brightness distributions. It includes a multiresolution filtering, a source-detection algorithm, and a maximum-likelihood fitting procedure. To optimize parameters, this algorithm is calibrated using extensive simulations before it is used to reanalyze the RASS data. In addition, the cross-correlation of the candidates with optical/infrared surveys is used for cluster identification and redshift estimation. Results. We found many known groups but also a number of new group candidates, which are not included in any previous X-ray or SZ cluster catalogs. In this paper, we present a pilot sample of 13 very extended groups discovered in the RASS at positions where no X-ray source has been detected previously and with clear optical counterparts. The X-ray fluxes of at least 5 of these are above the nominal flux-limits of previous RASS cluster catalogs ( greater than or similar to 3 x 10(-12) erg s(-1) cm(-2) in the 0.1-2.4 keV energy band). They have low mass (10(13) M-circle dot less than or similar to M-500 less than or similar to 10(14) M-circle dot; i.e., they are galaxy groups), are at low redshift (z < 0.08), and exhibit flatter surface-brightness distributions than usual. Conclusions. We demonstrate that galaxy groups were missed in previous RASS surveys, possibly due to the flat surface-brightness distributions of this potential new population. Analysis of the full sample will show if this might have a significant effect on previous cosmological parameter constraints based on RASS cluster surveys. |
| WOS关键词 | BRIGHTEST CLUSTER SAMPLE ; PROBE WMAP OBSERVATIONS ; MATTER POWER SPECTRUM ; COSMOLOGICAL CONSTRAINTS ; CATALOG ; NORMALIZATION ; PARAMETERS ; DENSITY ; MASS ; COMPILATION |
| 资助项目 | German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Aerospace Agency (DLR) ; Ministry of Economy and Technology (BMWi)[50 OR 1514] ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; National Program on Key Research and Development Project[2016YFA0400800] ; Chinese Academy of Sciences through Strategic Priority Research Program[XDB23040100] ; National Natural Science Foundation of China[11333005] ; National Aeronautics and Space Administration |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000450612000001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Aerospace Agency (DLR) ; German Aerospace Agency (DLR) ; Ministry of Economy and Technology (BMWi) ; Ministry of Economy and Technology (BMWi) ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; Chinese Academy of Sciences through Strategic Priority Research Program ; Chinese Academy of Sciences through Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Aerospace Agency (DLR) ; German Aerospace Agency (DLR) ; Ministry of Economy and Technology (BMWi) ; Ministry of Economy and Technology (BMWi) ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; Chinese Academy of Sciences through Strategic Priority Research Program ; Chinese Academy of Sciences through Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Aerospace Agency (DLR) ; German Aerospace Agency (DLR) ; Ministry of Economy and Technology (BMWi) ; Ministry of Economy and Technology (BMWi) ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; Chinese Academy of Sciences through Strategic Priority Research Program ; Chinese Academy of Sciences through Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Research Association (DFG) through the Transregional Collaborative Research Centre TRR33 The Dark Universe ; German Aerospace Agency (DLR) ; German Aerospace Agency (DLR) ; Ministry of Economy and Technology (BMWi) ; Ministry of Economy and Technology (BMWi) ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; CAS-DAAD Joint Fellowship Programme for Doctoral Students of Chinese Academy of Sciences ; National Program on Key Research and Development Project ; National Program on Key Research and Development Project ; Chinese Academy of Sciences through Strategic Priority Research Program ; Chinese Academy of Sciences through Strategic Priority Research Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23324]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Xu, Weiwei |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 3.Univ Bonn, Argelander Insitut Astron, Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Xu, Weiwei,Ramos-Ceja, Miriam E.,Pacaud, Florian,et al. A new X-ray-selected sample of very extended galaxy groups from the ROSAT All-Sky Survey[J]. ASTRONOMY & ASTROPHYSICS,2018,619:17. |
| APA | Xu, Weiwei,Ramos-Ceja, Miriam E.,Pacaud, Florian,Reiprich, Thomas H.,&Erben, Thomas.(2018).A new X-ray-selected sample of very extended galaxy groups from the ROSAT All-Sky Survey.ASTRONOMY & ASTROPHYSICS,619,17. |
| MLA | Xu, Weiwei,et al."A new X-ray-selected sample of very extended galaxy groups from the ROSAT All-Sky Survey".ASTRONOMY & ASTROPHYSICS 619(2018):17. |
入库方式： OAI收割
来源：国家天文台
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