TY - JOUR
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
N1 - Funding Information:
We are grateful to the ASCA team for their efforts on the design and operation of ASCA hardware and software. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration.
PY - 1996
Y1 - 1996
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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U2 - 10.1086/310184
DO - 10.1086/310184
M3 - Article
AN - SCOPUS:15444377656
SN - 0004-637X
VL - 466
SP - L75-L78
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART II
ER -