X‐ray study of clusters at the outer edge and beyond. Issue 4 (2nd May 2013)

• Record Type: Journal Article
• Authors: Ohashi, T.; Akamatsu, H.; Kawahara, H.; Sekiya, N.; Takei, Y.; Schartel, Norbert
• Is Part Of: Astronomische Nachrichten. Volume 334:Issue 4/5(2013)
• Page Start: 325
• Page End: 328
• Publication Date: 2013-05-02
• Subjects: Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.201211850
• Languages: English
• ISSNs: 0004-6337

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We report on recent Suzaku results on cluster outer regions. Relaxed clusters show a monotonous temperature decline to the virial radii, reaching 1/3 to 1/4 of the central levels. Significant temperature jumps have been confirmed for a number of radio relics, including A 3667, A 3376, and CIZA J2242.8+5301. This confirms that the radio relics generally correspond to shock fronts with the Mach numbers around 3. New filament junctions are identified by a new algorithm applied to the SDSS galaxy distribution and show significant X‐ray emission with Suzaku. The emission agrees with the <italic>L</italic>_X‐<italic>kT</italic> relation for elliptical galaxies and galaxy groups, and the junctions can be a important baryon reservoir. We propose a small X‐ray mission DIOS (Diffuse Intergalactic Oxygen Surveyor), equipped with microcalorimeters with a wide field of view (∼50′), which will detect the emission from warm‐hot intergalactic medium (WHIM) and measure detailed thermal and dynamical properties of the gas accreting onto clusters from the filaments. (© 2013 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)</p> </abstract>