2007ApJ...667...26P

Query : 2007ApJ...667...26P

2007ApJ...667...26P - Astrophys. J., 667, 26-34 (2007/September-3)

Calibration of the mass-temperature relation for clusters of galaxies using weak gravitational lensing.

PEDERSEN K. and DAHLE H.

Abstract (from CDS):

The main uncertainty in current determinations of the power spectrum normalization, σ₈, from abundances of X-ray-luminous galaxy clusters arises from the calibration of the mass-temperature relation. We use our weak-lensing mass determinations of 30 clusters from the hitherto largest sample of clusters with lensing masses, combined with X-ray temperature data from the literature, to calibrate the normalization of this relation at a temperature of 8 keV, M_500c,8keV=(8.7±1.6) h^–1 10¹⁴ M_☉. This normalization is consistent with previous lensing-based results based on smaller cluster samples, and with some predictions from numerical simulations, but higher than most normalizations based on X-ray-derived cluster masses. Assuming the theoretically expected slope α=3/2 of the mass-temperature relation, we derive σ₈=0.88±0.09 for a spatially flat ΛCDM universe with Ω_m=0.3. The main systematic errors on the lensing masses result from extrapolating the cluster masses beyond the field of view used for the gravitational lensing measurements, and from the separation of cluster/background galaxies, contributing each with a scatter of 20%. Taking this into account, there is still significant intrinsic scatter in the mass-temperature relation indicating that this relation may not be very tight, at least at the high-mass end. Furthermore, we find that dynamically relaxed clusters are (75±40)% hotter than nonrelaxed clusters.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Cosmological Parameters - Cosmology: Observations - Cosmology: Dark Matter - Cosmology: Gravitational Lensing - Galaxies: Clusters: General

Simbad objects: 34

Full paper

View the references in ADS

Number of rows : 34

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	ACO 68	ClG	00 37 06.2	+09 09 33					~	195	0
2	ACO 115	ClG	00 55 59	+26 23.2					~	295	1
3	ACO 209	ClG	01 31 52.9	-13 36 53					~	326	0
4	ACO 267	ClG	01 52 43.016	+00 59 58.90					~	241	0
5	ACO 520	ClG	04 54 10.1	+02 55 38					~	465	0
6	ACO 586	ClG	07 32 20.3	+31 37 58					~	196	0
7	ACO 611	ClG	08 00 58.7	+36 02 49					~	275	0
8	ACO 665	ClG	08 30 45.2	+65 52 55					~	457	0
9	ACO 697	ClG	08 42 57.6	+36 21 45					~	277	0
10	ACO 773	ClG	09 17 51.3	+51 43 20					~	308	0
11	ACO 963	ClG	10 17 03.4	+39 02 56					~	414	0
12	ACO 959	ClG	10 17 35.0	+59 33 28					~	76	0
13	ZwCl 1021+0426	ClG	10 23 39.0	+04 11 14	15.6	17.95			~	297	0
14	NAME Hubble Deep Field	reg	12 36 49.5	+62 12 58					~	1967	1
15	ACO 1576	ClG	12 36 59.5	+63 11 18					~	116	0
16	ACO 1682	ClG	13 06 49.7	+46 32 59					~	149	1
17	ACO 1722	ClG	13 20 08.3	+70 04 33					~	63	0
18	MCXC J1332.7+5032	ClG	13 32 44.8	+50 32 24					~	134	0
19	ACO 1763	ClG	13 35 20.1	+41 00 04					~	335	0
20	ACO 1835	ClG	14 01 02.07	+02 52 43.2					~	727	1
21	ACO 1914	ClG	14 25 57.4	+37 49 54					~	338	0
22	ACO 1995	ClG	14 52 55.0	+58 02 59					~	140	0
23	ZwCl 1455+2232	ClG	14 57 15.2	+22 20 30		18.62	20.04		~	309	0
24	NAME SMM J14573+2220	smm	14 57 16.4	+22 19 39					~	3	0
25	LEDA 1900245	Bla	15 32 53.780	+30 20 59.41	19.1		15.7	17.819	~	155	1
26	ClG J1532+3021	ClG	15 32 53.8	+30 21 00					~	122	0
27	ACO 2111	ClG	15 39 40.9	+34 25 04					~	188	0
28	ACO 2104	ClG	15 40 06.8	-03 17 39					~	113	0
29	ACO 2204	ClG	16 32 47.7	+05 34 18					~	457	0
30	ACO 2218	ClG	16 35 54.0	+66 13 00					~	827	1
31	ACO 2219	ClG	16 40 22.1	+46 42 20					~	381	0
32	ClG J1720+2638	ClG	17 20 09.6	+26 37 35					~	284	0
33	ACO 2261	ClG	17 22 26.9	+32 07 58					~	370	0
34	ClG J2129+0005	ClG	21 29 40.5	+00 05 47					~	308	0

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