Preface

Matsumoto, Hironori; Omura, Yasushi

doi:10.1016/s0273-1177(99)00415-9

Cited by 1 publication

(2 citation statements)

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“…The mapping observations of the Virgo cluster have been carried out in December 1996 to December 1998, with 28 pointings and a total exposure time of ∼ 500 ksec (Matsumoto et al 1999;Ohashi et al 1999;Yamasaki et al 1999). Together with the data in the archive, the area covered with ASCA in the Virgo cluster is ∼ 10 deg 2 .…”

Section: Observationmentioning

confidence: 99%

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Detection of an X-Ray Hot Region in the Virgo Cluster of Galaxies with [ITAL]ASCA[/ITAL]

Kikuchi¹,

Itoh²,

Kushino³

et al. 2000

The Astrophysical Journal

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Based on mapping observations with ASCA, an unusual hot region with a spatial extent of 1 deg2 was discovered between M87 and M49 at a center coordinate of R.A.=12h27m36s and decl.=9&j0;18' (J2000). The X-ray emission from the region has a 2-10 keV flux of 1x10-11 ergs s-1 cm-2 and a temperature of kT greater, similar4 keV, which is significantly higher than that in the surrounding medium of approximately 2 keV. The internal thermal energy in the hot region is estimated to be VnkT approximately 1060 ergs with a gas density of approximately 10-4 cm-3. A power-law spectrum with a photon index of 1.7-2.3 is also allowed by the data. The hot region suggests there is an energy input due to a shock that is probably caused by the motion of the gas associated with M49, infalling toward the M87 cluster with a velocity greater, similar1000 km s-1.

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Section: Observationmentioning

confidence: 99%

“…Based on this template image, a ray-tracing simulation (Tsusaka et al 1995) for the GIS observation was carried out assuming a uniform temperature of 2.0 keV and a metallicity of 0.2 solar, which are the typical parameters in the Virgo field (e.g. Koyama, Takano, & Tawara 1991;Matsumoto et al 1999).…”

Section: Image Analysismentioning

confidence: 99%