The missing soft X-ray luminosity in cluster cooling flows

被引：67

作者：

Fabian, AC ^{[1
]}

Allen, SW ^{[1
]}

Crawford, CS ^{[1
]}

Johnstone, RM ^{[1
]}

Morris, RG ^{[1
]}

Sanders, JS ^{[1
]}

Schmidt, RW ^{[1
]}

机构：

[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2002年 / 332卷 / 03期

关键词：

galaxies : clusters : general; cooling flows; X-rays : galaxies;

D O I：

10.1046/j.1365-8711.2002.05510.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The gas temperature in the cores of many clusters of galaxies drops inward by about a factor of 3 or more within the central 100-kpc radius. The radiative cooling time drops over the same region from 5 or more Gyr down to below a few 10(8) yr. Although this indicates that cooling flows are taking place, XMM-Newton spectra show no evidence for strong mass cooling rates of gas below 1-2 keV. The soft X-ray luminosity expected from steady cooling flows is missing. Here we outline and test the energetics of a cold mixing model in which gas below 1-2 keV falls from the flow and is rapidly cooled by mixing with cold gas. The missing X-ray luminosity can emerge in the ultraviolet, optical and infrared bands, where strong emission nebulosities are commonly seen. We explore further the requirements for any heat sources that balance the radiative cooling in cluster cores.

引用

页码：L50 / L54

页数：5

共 50 条

[1] X-RAY FILAMENTS IN CLUSTER COOLING FLOWS
SARAZIN, CL
[J]. SPACE ASTRONOMY, 1993, 13 (12): : 365 - 368
[2] On the soft X-ray spectrum of cooling flows
Fabian, AC
Mushotzky, RF
Nulsen, PEJ
Peterson, JR
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 321 (01) : L20 - L24
[3] COOLING FLOWS AND THE X-RAY LUMINOSITY TEMPERATURE RELATION FOR CLUSTERS
FABIAN, AC
CRAWFORD, CS
EDGE, AC
MUSHOTZKY, RF
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 267 (03) : 779 - 784
[4] Nonthermal X-ray emission: An alternative to cluster cooling flows?
McCarthy, IG
West, MJ
Welch, GA
[J]. ASTROPHYSICAL JOURNAL, 2002, 567 (02): : 762 - 771
[5] THE INFLUENCE OF CLUSTER COOLING FLOWS ON IMAGING X-RAY SURVEYS
PESCE, JE
FABIAN, AC
EDGE, AC
JOHNSTONE, RM
[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1990, 244 (01) : 58 - 63
[6] Cluster X-ray luminosity evolution
Henry, JP
[J]. NEW CENTURY OF X-RAY ASTRONOMY, 2001, 251 : 150 - 153
[7] Evolution of the cluster X-ray luminosity function
Mullis, CR
Vikhlinin, A
Henry, JP
Forman, W
Gioia, IM
Hornstrup, A
Jones, C
McNamara, BR
Quintana, H
[J]. ASTROPHYSICAL JOURNAL, 2004, 607 (01): : 175 - 189
[8] The soft X-ray luminosity function of polars
Barrett, P
Singh, KP
Mitchell, S
[J]. ANNAPOLIS WORKSHOP ON MAGNETIC CATACLYSMIC VARIABLES, 1999, 157 : 180 - 186
[9] X-RAY HALOES AND COOLING FLOWS
FABIAN, AC
[J]. IAU SYMPOSIA, 1991, (144): : 237 - 244
[10] X-ray imaging of cooling flows
Bohringer, H
[J]. GALACTIC AND CLUSTER COOLING FLOWS, 1997, 115 : 11 - 20

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