Journal Article

Suzaku Constraints on Soft and Hard Excess Emissions from Abell 2199

Madoka Kawaharada, Kazuo Makishima, Takao Kitaguchi, Sho Okuyama, Kazuhiro Nakazawa and Yasushi Fukazawa

in Publications of the Astronomical Society of Japan

Volume 62, issue 1, pages 115-129
Published in print February 2010 | ISSN: 0004-6264
Published online February 2010 | e-ISSN: 2053-051X | DOI:
Suzaku Constraints on Soft and Hard Excess Emissions from Abell 2199

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The nearby ([math] 0.03015) cluster of galaxies Abell 2199 was observed by Suzaku in X-rays, with five pointings for [math] 20 ks each. From the XIS data, the temperature and metal abundance profiles were derived out to [math] 700 kpc (0.4 times the virial radius). Both of these quantities decrease gradually from the center to peripheries by a factor of [math] 2, while the oxygen abundance tends to be flat. The temperature within 12[math] ([math] 430 kpc) is [math] 4 keV, and the 0.5–10 keV X-ray luminosity integrated up to 30[math] is (2.9[math]0.1) [math] 10[math]erg s[math], in agreement with previous XMM-Newton measurements. Above this thermal emission, no significant excess was found either in the XIS range below [math] 1 keV, or in the HXD-PIN range above [math] 15 keV. The 90%-confidence upper limit on the emission measure of an assumed 0.2 keV warm gas is (3.7–7.5) [math] 10[math]cm[math]arcmin[math], which is 3.7–7.6 times tighter than the detection reported with XMM-Newton. The 90%-confidence upper limit on the 20–80 keV luminosity of any power-law component is 1.8 [math] 10[math]erg s[math], assuming a photon index of 2.0. Although this upper limit does not reject the possible 2.1[math] detection by the BeppoSAX PDS, it is a factor of 2.1 tighter than that of the PDS if both are considered upper limits. The non-detection of the hard excess can be reconciled with the upper limit on diffuse radio emission, without invoking very low magnetic fields ([math] 0.073[math]G) which were suggested previously.

Keywords: galaxies: clusters: individual (Abell 2199); X-rays: galaxies: clusters

Journal Article.  8568 words.  Illustrated.

Subjects: Galaxies ; Astronomy and Astrophysics

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