2004A&A...420..853L


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET19:09:35

2004A&A...420..853L - Astronomy and Astrophysics, volume 420, 853-872 (2004/6-4)

The XMM-NEWTON Ω project. I. The X-ray luminosity-temperature relation at z>0.4.

LUMB D.H., BARTLETT J.G., ROMER A.K., BLANCHARD A., BURKE D.J., COLLINS C.A., NICHOL R.C., GIARD M., MARTY P.B., NEVALAINEN J., SADAT R. and VAUCLAIR S.C.

Abstract (from CDS):

We describe XMM-Newton Guaranteed Time observations of a sample of eight high redshift (0.45<z<0.62) clusters. The goal of these observations was to measure the luminosity and the temperature of the clusters to a precision of ∼10%, leading to constraints on the possible evolution of the luminosity-temperature (Lx-Tx) relation, and ultimately on the values of the matter density, ΩM, and, to a lesser extent, the cosmological constant ΩΛ. The clusters were drawn from the SHARC and 160 Square Degree (160SD) ROSAT surveys and span a bolometric (0.0-20keV) luminosity range of 2.0 to 14.4x1044erg/s (H0=50, ΩM=1, ΩΛ=0). Here we describe our data analysis techniques and present, for the first time with XMM-Newton, a Lx-Tx relation. For each of the eight clusters in the sample, we have measured total (r<rvirial) bolometric luminosities, performed β-model fits to the radial surface profiles and made spectral fits to a single temperature isothermal model. We describe data analysis techniques that pay particular attention to background mitigation. We have also estimated temperatures and luminosities for two known clusters (Abell 2246 and RX J1325.0-3814), and one new high redshift cluster candidate (XMMU J084701.8+345117), that were detected off-axis. Characterizing the Lx-Tx relation as Lx=L6((T)/(6keV))α, we find L6=15.9+7.6–5.2x1044erg/s and α=2.7±0.4 for an ΩΛ=0.0, ΩM=1.0, H0=50km/s/Mpc cosmology at a typical redshift z ∼0.55. Comparing with the low redshift study by Markevitch (1998ApJ...504...27M), we find α to be in agreement, and assuming Lx-Tx to evolve as (1+z)A, we find A=0.68±0.26 for the same cosmology and A=1.52+0.26–0.27 for an ΩΛ=0.7, ΩM=0.3 cosmology. Our A values are very similar to those found previously by Vikhlinin et al. (2002ApJ...578L.107V) using a compilation of Chandra observations of 0.39<z<1.26 clusters. We conclude that there is now evidence from both XMM-Newton and Chandra for an evolutionary trend in the Lx-Tx relation. This evolution is significantly below the level expected from the predictions of the self-similar model for an ΩΛ=0.0, ΩM=1.0, cosmology, but consistent with self-similar model in an ΩΛ=0.7, ΩM=0.3 cosmology. Our observations lend support to the robustness and completeness of the SHARC and 160SD surveys.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies: clusters

CDS comments: IRAS 13224-3609 is a misprint for IRAS 13224-3809.

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PHL 4470 blu 03 37.7 -25 22   18.1       ~ 1 0
2 ClG J0337-2522 ClG 03 37 44.9 -25 22 39           ~ 19 0
3 2MASS J03374551-2522053 * 03 37 45.5214179202 -25 22 05.288453773   16.9 16.7     ~ 1 0
4 BAX 076.3329-28.8181 ClG 05 05 19.9 -28 49 05           ~ 12 0
5 QSO B0843+349 QSO 08 46 59.3273059646 +34 48 25.169459130   18.75 18.56     ~ 35 0
6 2XMM J084701.9+345114 ClG 08 47 01.8 +34 51 17           ~ 7 0
7 ClG J0847+3449 ClG 08 47 11.3 +34 49 16           ~ 23 0
8 Ton 951 Sy1 08 47 42.4487014731 +34 45 04.483113429   14.83 14.50     ~ 429 0
9 ClG J1120+4318 ClG 11 20 07.6 +43 18 07           ~ 54 0
10 2MASX J13251937-3824524 Sy1 13 25 19.3805503234 -38 24 52.611897329   16.64 13.80 15.33   ~ 358 0
11 1WGA J1325.5-3825 ClG 13 25 34.9 -38 25 50           ~ 10 0
12 ZwCl 1332+5043 ClG 13 34 20.0 +50 30 54           ~ 35 0
13 ClG J1354-0221 ClG 13 54 16.9 -02 21 47           ~ 42 0
14 ACO 2246 ClG 17 00 41.94 +64 13 16.9           ~ 47 0
15 HS 1700+6416 QSO 17 01 00.6195618802 +64 12 09.118927057   16.39 16.17     ~ 345 0
16 ClG J1701+6414 ClG 17 01 22.6 +64 14 09           ~ 64 0

    Equat.    Gal    SGal    Ecl

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2021.02.26-19:09:35

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