Are we missing baryons in galaxy clusters?

被引：68

作者：

Ettori, S ^{[1
]}

机构：

[1] European So Observ, D-85748 Garching, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 344卷 / 02期

关键词：

galaxies : clusters : general; galaxies : fundamental parameters; intergalactic medium; cosmology : observations; dark matter; X-rays : galaxies;

D O I：

10.1046/j.1365-8711.2003.06810.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The recent constraints on cosmological parameters obtained from the observations of the WMAP satellite limit the cosmic baryon fraction in a range that is larger than, and marginally consistent with, what is measured in galaxy clusters. This raises the question of whether or not we are considering all the ingredients of the cluster baryonic budget. Carefully weighing the baryons in X-ray-emitting plasma and stars in cluster galaxies, I conclude that the cluster baryonic pie consists of 13 (with a 1sigma range of 8-19) per cent of stars, 70 (56-89) per cent of intracluster hot medium and 17 (0-33) per cent (and a probability of 73 per cent of being larger than 0) of 'other' baryons, presumably in the form of warm (10(5)-10(7) K) material.

引用

收藏

页码：L13 / L16

页数：4

相关论文

共 30 条

[11] Galaxy clusters in Hubble volume simulations: Cosmological constraints from sky survey populations [J].

Evrard, AE ;

MacFarland, TJ ;

Couchman, HMP ;

Colberg, JM ;

Yoshida, N ;

White, SDM ;

Jenkins, A ;

Frenk, CS ;

Pearce, FR ;

Peacock, JA ;

Thomas, PA .

ASTROPHYSICAL JOURNAL, 2002, 573 (01) :7-36

[12] Cooling flows in clusters of galaxies [J].

Fabian, AC .

LIGHTHOUSES OF THE UNIVERSE: THE MOST LUMINOUS CELESTIAL OBJECTS AND THEIR USE FOR COSMOLOGY, 2002, :24-36

[13]

FABIAN AC, 1997, SCI, V275, P84

[14] Detection of intergalactic red-giant-branch stars in the Virgo cluster [J].

Ferguson, HC ;

Tanvir, NR ;

von Hippel, T .

NATURE, 1998, 391 (6666) :461-463

[15] The Santa Barbara cluster comparison project: A comparison of cosmological hydrodynamics solutions [J].

Frenk, CS ;

White, SDM ;

Bode, P ;

Bond, JR ;

Bryan, GL ;

Cen, R ;

Couchman, HMP ;

Evrard, AE ;

Gnedin, N ;

Jenkins, A ;

Khokhlov, AM ;

Klypin, A ;

Navarro, JF ;

Norman, ML ;

Ostriker, JP ;

Owen, JM ;

Pearce, FR ;

Pen, UL ;

Steinmetz, M ;

Thomas, PA ;

Villumsen, JV ;

Wadsley, JW ;

Warrren, MS ;

Xu, G ;

Yepes, G .

ASTROPHYSICAL JOURNAL, 1999, 525 (02) :554-582

[16] The cosmic baryon budget [J].

Fukugita, M ;

Hogan, CJ ;

Peebles, PJE .

ASTROPHYSICAL JOURNAL, 1998, 503 (02) :518-530

[17] A population of intergalactic supernovae in galaxy clusters [J].

Gal-Yam, A ;

Maoz, D ;

Guhathakurta, P ;

Filippenko, AV .

ASTRONOMICAL JOURNAL, 2003, 125 (03) :1087-1094

[18]

GILMORE G, 1999, P 2 INT WORKSH ID DA, P121

[19] Observational mass-to-light ratio of galaxy systems from poor groups to rich clusters [J].

Girardi, M ;

Manzato, P ;

Mezzetti, M ;

Giuricin, G ;

Limboz, F .

ASTROPHYSICAL JOURNAL, 2002, 569 (02) :720-741

[20] XMM-Newton confirmation of soft X-ray excess emission in clusters of galaxies - The discovery of O VII emission from an extended warm baryonic component [J].

Kaastra, JS ;

Lieu, R ;

Tamura, T ;

Paerels, FBS ;

den Herder, JW .

ASTRONOMY & ASTROPHYSICS, 2003, 397 (02) :445-462