Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l.131b&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. L131-L136
Astronomy and Astrophysics
Astronomy
16
Abundance, Galactic Clusters, Galactic Evolution, Gravitational Lenses, Intergalactic Media, Iron, K Lines, X Ray Astronomy, X Ray Spectra, Astronomical Models, Charge Coupled Devices, Error Analysis, Imaging Spectrometers, Luminosity, Red Shift, Satellite-Borne Instruments, X Ray Spectroscopy
Scientific paper
ASCA observations of the gravitational lens and Butcher-Oemler cluster Abell 370 (z = 0.37) give kT = 8.8 +/- 0.8 keV and A = 0.5 +/- 0.1 cosmic. If the gas were isothermal the implied cluster mass would be Mvir = (1.5 +/- 0.4) x 1015 solar masses, a value consistent with the optically-determined virial mass. We detect iron K line emission with high confidence. This measurement increases, by a large factor, the lookback time at which the presence of iron in the intracluster medium has been established. The iron abundance is marginally higher than that of low-redshift clusters of similar temperature, so our results are consistent with models in which all enrichment occurs before the epoch corresponding to z = 0.37.
Arnaud A. A. K.
Bautz Marshall W.
Crew Geoffrey B.
Fabian Andrew C.
Gendreau Keith Charles
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