2007PASJ...59S.339T

Query : 2007PASJ...59S.339T

2007PASJ...59S.339T - Publ. Astron. Soc. Jap., 59, 339-349 (2007/January-0)

Search for oxygen emission from warm-hot intergalactic medium around A2218 with Suzaku.

TAKEI Y., OHASHI T., HENRY J.P., MITSUDA K., FUJIMOTO R., TAMURA T., YAMASAKI N.Y., HAYASHIDA K., TAWA N., MATSUSHITA K., BAUTZ M.W., HUGHES J.P., MADEJSKI G.M., KELLEY R.L. and ARNAUD K.A.

Abstract (from CDS):

We searched for redshifted O emission lines from a possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the X-ray Imaging Spectrometer (XIS) instrument on Suzaku. This cluster is thought to have an elongated structure along the line of sight based on previous studies. We studied systematic uncertainties in the spectrum of the Galactic emission and in the soft X-ray response of the detectors due to the contamination building up on the XIS filters. We detected no significant redshifted O lines, and set a tight constraint on the intensity with upper limits for the surface brightness of O <FONT SIZE="-2">VII</FONT> and O <FONT SIZE="-2">VIII</FONT> lines of 1.1 x 10–7 and 3.0 x 10–7 photons/cm2/s/arcmin2, respectively. These upper limits are significantly lower than the previously reported fluxes from the WHIM around other clusters of galaxies. We also discuss the prospect for detecting the WHIM lines with the Suzaku XIS in the future.

Abstract Copyright: ∼

Journal keyword(s): cosmology: large-scale structure - galaxies: clusters: individual (A2218) - galaxies: intergalactic medium - X-rays: diffuse background

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
2 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
3 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
4 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
5 ACO 2052 ClG 15 16 41.64 +07 01 45.5           ~ 756 1
6 ACT-CL J1521.8+0742 ClG 15 21 48.8 +07 43 41     15.13     ~ 326 0
7 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
8 NAME LHB X 16 42.0 +02 19           ~ 414 0
9 ACO S 1101 ClG 23 13 58.5 -42 43 39           ~ 272 1

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