Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279...53r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 53-59.
Astronomy and Astrophysics
Astronomy
28
Abundance, Astronomical Spectroscopy, Galactic Clusters, Plasma Temperature, X Ray Sources, Emission Spectra, Heao 1, High Temperature Plasmas, Line Spectra, Spaceborne Astronomy, Temperature Measurement
Scientific paper
Results of the Einstein Solid State Spectrometer (SSS) observations of the central region of Abell 576 combined with HEAO 1 spectra of the total cluster are reported. Line emission due to Fe, Si, and S from a hot plasma in the central region of the object are detected. Abundances roughly one-half of the solar value are derived for these elements. The total cluster spectrum is well fitted by a thermal bremsstrahlung model with a temperature of 4 +3.5 or -1.4 x 10 to the 7th K. This temperature is in conflict with the SSS temperature determination for the center of the cluster. This difference can be explained if cooling takes place in the central part of the cluster, or if the X-ray emission in the center is dominated by the emission of a single galaxy.
Holt Stephen S.
Mushotzky Richard F.
Rothenflug R.
Vigroux Laurant
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