Non-uniform temperature distribution in the galaxy clusters 2A 0335 + 096 and Abell 496 observed by XMM-Newton

Takeshi Tanaka, Hideyo Kunieda, Murat Hudaverdi, Akihiro Furuzawa, Yuzuru Tawara

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We present the XMM-Newton results of the galaxy clusters 2A 0335 + 096 and A 496. From an investigation of 2-dimensional ICM profiles, we obtained new features related to dynamical activities in the ICM. In 2A 0335 + 096, we found a spiral cool tail around the central cold core, which is trailing from the opposite side of the cold front observed by Chandra. The deprojected temperature of the tail is 1.7 keV. The spiral feature apparently shows a turnaround motion of the core. We suggest that the cool tail feature represents evidence for turbulent viscous stripping of the remaining subcluster core. For A 496, we found another cold front 4′ south of the X-ray emission peak. From the pressure profile across the cold front, we derived an upper limit to the Mach number of a gas body of 0.2. Regarding the temperature distribution in the outer region, we found non-uniformity on the cluster scale for both clusters, which suggests that both clusters experienced a merger in the past. We argue that the gas dynamical motions seen in the central regions of both clusters can be attributed to the past merger.

Original languageEnglish
Pages (from-to)703-718
Number of pages16
JournalPublications of the Astronomical Society of Japan
Volume58
Issue number4
DOIs
Publication statusPublished - 01-01-2006
Externally publishedYes

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cold front
XMM-Newton telescope
newton
cold fronts
temperature distribution
galaxies
merger
temperature
gas
profiles
stripping
gases
Mach number
nonuniformity
distribution
x rays

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

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title = "Non-uniform temperature distribution in the galaxy clusters 2A 0335 + 096 and Abell 496 observed by XMM-Newton",
abstract = "We present the XMM-Newton results of the galaxy clusters 2A 0335 + 096 and A 496. From an investigation of 2-dimensional ICM profiles, we obtained new features related to dynamical activities in the ICM. In 2A 0335 + 096, we found a spiral cool tail around the central cold core, which is trailing from the opposite side of the cold front observed by Chandra. The deprojected temperature of the tail is 1.7 keV. The spiral feature apparently shows a turnaround motion of the core. We suggest that the cool tail feature represents evidence for turbulent viscous stripping of the remaining subcluster core. For A 496, we found another cold front 4′ south of the X-ray emission peak. From the pressure profile across the cold front, we derived an upper limit to the Mach number of a gas body of 0.2. Regarding the temperature distribution in the outer region, we found non-uniformity on the cluster scale for both clusters, which suggests that both clusters experienced a merger in the past. We argue that the gas dynamical motions seen in the central regions of both clusters can be attributed to the past merger.",
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Non-uniform temperature distribution in the galaxy clusters 2A 0335 + 096 and Abell 496 observed by XMM-Newton. / Tanaka, Takeshi; Kunieda, Hideyo; Hudaverdi, Murat; Furuzawa, Akihiro; Tawara, Yuzuru.

In: Publications of the Astronomical Society of Japan, Vol. 58, No. 4, 01.01.2006, p. 703-718.

Research output: Contribution to journalArticle

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AU - Furuzawa, Akihiro

AU - Tawara, Yuzuru

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