Issue |
A&A
Volume 391, Number 3, September I 2002
|
|
---|---|---|
Page(s) | 841 - 855 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020905 | |
Published online | 09 August 2002 |
Gravitating mass profiles of nearby galaxy clusters and relations with X-ray gas temperature, luminosity and mass
1
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
2
Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy
3
Istituto di Fisica Cosmica “G.Occhialini”, via Bassini 15, 20133 Milano, Italy
Corresponding author: S. Ettori, settori@eso.org
Received:
24
February
2002
Accepted:
7
June
2002
We consider a sample of 22 nearby clusters of galaxies observed with the
Medium Energy Concentrator Spectrometer (MECS) on board
BeppoSAX . They cover the range in gas temperature between 3 and 10 keV,
with bolometric X-ray luminosity between erg s-1
and
erg s-1.
Using the de-projected gas temperature and density profiles
resolved in a number of bins between 5 and 7 and obtained
from this dataset only, we recover the total gravitating mass profiles
for 20 objects just applying the (i) spherical symmetry
and (ii) hydrostatic equilibrium assumptions.
We investigate the correlations between total mass, gas temperature
and luminosity at several overdensities values and find that the slopes
of these relations are independent of the considered overdensity
and consistent with what is predicted from the cluster scaling laws.
The best-fit results on the normalization of the
relation
are slightly lower, but still consistent considering
the large errors that we measure, with hydrodynamical
simulations.
A segregation between relaxed and non-relaxed systems is
present in each plane of these relations pointing out
a significant component in their intrinsic scatter.
This segregation becomes more evident at higher overdensities
and when physical quantities, like Mgas and L, that
are direct functions of the amount of gas observed, are considered.
Key words: galaxies: cluster: general / galaxies: fundamental parameters / intergalactic medium / X-ray: galaxies / cosmology: observations / dark matter
© ESO, 2002
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