C.D.S. - SIMBAD4 rel 1.7 - 2020.01.24CET09:02:42

2017MNRAS.469.3984B - Mon. Not. R. Astron. Soc., 469, 3984-3993 (2017/August-3)

Characterization of the warm-hot intergalactic medium near the Coma cluster through high-resolution spectroscopy of X Comae.


Abstract (from CDS):

We have analysed all available archival XMM-Newton observations of X Comae, a bright X-ray quasar behind the Coma cluster, to study the properties of the warm-hot intergalactic medium (WHIM) in the vicinity of the nearest massive galaxy cluster. The reflection grating spectrometer observations confirm the possible presence of a Ne IX K α absorption line at the redshift of Coma, although with a limited statistical significance. This analysis is therefore in line with the earlier analysis by Takei et al. based on a sub-set of these data. Its large column density and optical depth, however, point to implausible conditions for the absorbing medium, thereby casting serious doubts to its reality. Chandra has never observed X Comae and therefore cannot provide additional information on this source. We combine upper limits to the presence of other X-ray absorption lines (notably from O VII and O VIII) at the redshift of Coma with positive measurements of the soft excess emission from Coma measured by ROSAT (Bonamente et al.). The combination of emission from warm-hot gas at kT ∼ 1/4 keV and upper limits from absorption lines provide useful constraints on the density and the sightline length of the putative WHIM towards Coma. We conclude that the putative warm-hot medium towards Coma is consistent with expected properties, with a baryon overdensity δb >= 10 and a sightline extent of order of tens of Mpc.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): intergalactic medium - quasars: absorption lines - quasars: individual: X Comae - large-scale structure of Universe - X-rays: galaxies - X-rays: galaxies

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 Ton 1388 Sy1 11 19 08.6786143504 +21 19 17.986556889   14.91 14.80     ~ 407 0
2 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4132 2
3 NAME X Comae Galaxy Sy1 13 00 22.1585922148 +28 24 02.638271764   17.23 16.65     ~ 80 0

    Equat.    Gal    SGal    Ecl

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