ASCA observations of the distant cluster A1204

Masakazu Matsuura, Shigeru J. Miyoshi, Koujun Yamashita, Yuzuru Tawara, Akihiro Furuzawa, Anthony N. Lasenby, Richard Saunders, Michael Jones, Isamu Hatsukade

Research output: Contribution to journalArticle

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Abstract

We report the results of ASCA and Ryle Telescope observations of the distant cluster of galaxies A1204. The X-ray image shows that this source is very compact and that the intracluster gas is strongly centrally concentrated. The brightness temperature decrement of the cosmic microwave background radiation toward this cluster (the Sunyaev-Zeldovich effect) was not detected by the Ryle Telescope, with a 1 σ upper limit of |ΔT| < 360 μK. The gas temperature is 3.6 keV, which is considerably lower than that expected from the bright X-ray luminosity in the ROSAT band and explains the lack of detection. The hot gas mass within 1 Mpc is estimated to be ≲7 × 1013 M0. In the wide window of the ASCA Gas Imaging Spectrometer, a very faint X-ray source was found at R.A. = 11h12m16s, decl. = +17°56′40″ (J2000). The observed count rate was too small to identify the X-ray emission mechanism in the new source.

Original languageEnglish
JournalAstrophysical Journal
Volume466
Issue number2 PART II
Publication statusPublished - 01-01-1996

Fingerprint

gas
x rays
Sunyaev-Zeldovich effect
telescopes
cosmic microwave background radiation
brightness temperature
imaging spectrometers
high temperature gases
gas temperature
gases
spectrometer
luminosity
galaxies
temperature
detection
rate
effect
background radiation
microwave

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Matsuura, M., Miyoshi, S. J., Yamashita, K., Tawara, Y., Furuzawa, A., Lasenby, A. N., ... Hatsukade, I. (1996). ASCA observations of the distant cluster A1204. Astrophysical Journal, 466(2 PART II).
Matsuura, Masakazu ; Miyoshi, Shigeru J. ; Yamashita, Koujun ; Tawara, Yuzuru ; Furuzawa, Akihiro ; Lasenby, Anthony N. ; Saunders, Richard ; Jones, Michael ; Hatsukade, Isamu. / ASCA observations of the distant cluster A1204. In: Astrophysical Journal. 1996 ; Vol. 466, No. 2 PART II.
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Matsuura, M, Miyoshi, SJ, Yamashita, K, Tawara, Y, Furuzawa, A, Lasenby, AN, Saunders, R, Jones, M & Hatsukade, I 1996, 'ASCA observations of the distant cluster A1204', Astrophysical Journal, vol. 466, no. 2 PART II.

ASCA observations of the distant cluster A1204. / Matsuura, Masakazu; Miyoshi, Shigeru J.; Yamashita, Koujun; Tawara, Yuzuru; Furuzawa, Akihiro; Lasenby, Anthony N.; Saunders, Richard; Jones, Michael; Hatsukade, Isamu.

In: Astrophysical Journal, Vol. 466, No. 2 PART II, 01.01.1996.

Research output: Contribution to journalArticle

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T1 - ASCA observations of the distant cluster A1204

AU - Matsuura, Masakazu

AU - Miyoshi, Shigeru J.

AU - Yamashita, Koujun

AU - Tawara, Yuzuru

AU - Furuzawa, Akihiro

AU - Lasenby, Anthony N.

AU - Saunders, Richard

AU - Jones, Michael

AU - Hatsukade, Isamu

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N2 - We report the results of ASCA and Ryle Telescope observations of the distant cluster of galaxies A1204. The X-ray image shows that this source is very compact and that the intracluster gas is strongly centrally concentrated. The brightness temperature decrement of the cosmic microwave background radiation toward this cluster (the Sunyaev-Zeldovich effect) was not detected by the Ryle Telescope, with a 1 σ upper limit of |ΔT| < 360 μK. The gas temperature is 3.6 keV, which is considerably lower than that expected from the bright X-ray luminosity in the ROSAT band and explains the lack of detection. The hot gas mass within 1 Mpc is estimated to be ≲7 × 1013 M0. In the wide window of the ASCA Gas Imaging Spectrometer, a very faint X-ray source was found at R.A. = 11h12m16s, decl. = +17°56′40″ (J2000). The observed count rate was too small to identify the X-ray emission mechanism in the new source.

AB - We report the results of ASCA and Ryle Telescope observations of the distant cluster of galaxies A1204. The X-ray image shows that this source is very compact and that the intracluster gas is strongly centrally concentrated. The brightness temperature decrement of the cosmic microwave background radiation toward this cluster (the Sunyaev-Zeldovich effect) was not detected by the Ryle Telescope, with a 1 σ upper limit of |ΔT| < 360 μK. The gas temperature is 3.6 keV, which is considerably lower than that expected from the bright X-ray luminosity in the ROSAT band and explains the lack of detection. The hot gas mass within 1 Mpc is estimated to be ≲7 × 1013 M0. In the wide window of the ASCA Gas Imaging Spectrometer, a very faint X-ray source was found at R.A. = 11h12m16s, decl. = +17°56′40″ (J2000). The observed count rate was too small to identify the X-ray emission mechanism in the new source.

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Matsuura M, Miyoshi SJ, Yamashita K, Tawara Y, Furuzawa A, Lasenby AN et al. ASCA observations of the distant cluster A1204. Astrophysical Journal. 1996 Jan 1;466(2 PART II).