The Lx-Yx relation:: Using galaxy cluster X-ray luminosity as a robust, low-scatter mass proxy

被引:126
作者
Maughan, B. J. [1 ]
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02140 USA
关键词
cosmology : observations; galaxies : clusters : general; galaxies : high-redshift; intergalactic medium; X-rays : galaxies;
D O I
10.1086/520831
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use a sample of 115 galaxy clusters at 0.1 < z < 1.3 observed with Chandra ACIS-I to investigate the relation between luminosity and Y-X (the product of gas mass and temperature). The scatter in the relation is dominated by cluster cores, and a tight L-X-Y-X relation (11% intrinsic scatter in L-X) is recovered if sufficiently large core regions (0.15R(500)) are excluded. The intrinsic scatter is well described by a lognormal distribution, and the relations are consistent for relaxed and disturbed/merging clusters. We investigate the L-X-Y-X relation in low-quality data (e. g., for clusters detected in X-ray survey data) by estimating L-X from soft-band count rates, and find that the scatter increases somewhat to 21%. We confirm the tight correlation between Y-X and mass and the self-similar evolution of that scaling relation out to z = 0.6 for a subset of clusters in our sample with mass estimates from the literature. This is used to estimate masses for the entire sample and hence measure the L-X-M relation. We find that the scatter in the L-X-M relation is much lower than previous estimates, due to the full removal of cluster cores and more robust mass estimates. For high-redshift clusters the scatter in the L-X-M relation remains low if cluster cores are not excluded. These results suggest that cluster masses can be reliably estimated from simple luminosity measurements in low-quality data where direct mass estimates, or measurements of Y-X, are not possible. This has important applications in the estimation of cosmological parameters from X-ray cluster surveys.
引用
收藏
页码:772 / 780
页数:9
相关论文
共 42 条
[1]   Linear regression for astronomical data with measurement errors and intrinsic scatter [J].
Akritas, MG ;
Bershady, MA .
ASTROPHYSICAL JOURNAL, 1996, 470 (02) :706-714
[2]   Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters [J].
Allen, SW ;
Schmidt, RW ;
Ebeling, H ;
Fabian, AC ;
van Speybroeck, L .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 353 (02) :457-467
[3]  
AMAUD M, 1999, MNRAS, V305, P631
[4]   The structural and scaling properties of nearby galaxy clusters -: II.: The M-T relation [J].
Arnaud, M ;
Pointecouteau, E ;
Pratt, GW .
ASTRONOMY & ASTROPHYSICS, 2005, 441 (03) :893-903
[5]  
Böhringer H, 2001, ASTRON ASTROPHYS, V369, P826, DOI 10.1051/0004-6361:20010240
[6]  
BURENIN RA, 2007, UNPUB APJS
[7]   Statistics of X-ray observables for the cooling-core and non-cooling core galaxy clusters [J].
Chen, Y. ;
Reiprich, T. H. ;
Boehringer, H. ;
Ikebe, Y. ;
Zhang, Y.-Y. .
ASTRONOMY & ASTROPHYSICS, 2007, 466 (03) :805-U28
[8]   MACS: A quest for the most massive galaxy clusters in the universe [J].
Ebeling, H ;
Edge, AC ;
Henry, JP .
ASTROPHYSICAL JOURNAL, 2001, 553 (02) :668-676
[9]   The ROSAT Brightest Cluster Sample -: I.: The compilation of the sample and the cluster log N log S distribution [J].
Ebeling, H ;
Edge, AC ;
Böhringer, H ;
Allen, SW ;
Crawford, CS ;
Fabian, AC ;
Voges, W ;
Huchra, JP .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 301 (04) :881-914
[10]   COOLING FLOWS IN CLUSTERS OF GALAXIES [J].
FABIAN, AC .
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1994, 32 :277-318