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Diffuse EUV Emission from Clusters of Galaxies

Published online by Cambridge University Press:  25 May 2016

S. Bowyer ,
R. Lieu  and
J. P. Mittaz
S. Bowyer
Affiliation:
Space Sciences Laboratory University of California, Berkeley, CA 94720-7450, USA
R. Lieu
Affiliation:
Department of Physics University of Alabama, Huntsville, AL 35988, USA
J. P. Mittaz
Affiliation:
Mullard Space Science Laboratory Holmbury St. Mary, Dorking, Surrey, UK

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Diffuse EUV emission has been detected in five clusters of galaxies: Virgo(Lieu et al., 1996a), Coma (Lieu et al., 1996b), Abell 1795, Abell 2199, and Abell 4038. These results were 'obtained with the Deep Survey Telescope of the Extreme Ultraviolet Explorer (Bowyer and Malina, 1991) using a Lex/B filter which covers the 60 to 170 A band. The extent of this diffuse emission from these clusters r_anges from 20' to 40' in diameter. The statistical significance of these results varies from 8 to 50 standard deviations. Some EUV emission would be expected fromthe low-energy tail of the wellstudied X-ray cluster emission, However, the EUV emission detected is far greater than the expected emission from the X-ray-emitting gas. Marginal sigatures of this “soft excess” are often present in the lowest energy resolution band of the ROSAT PSPC where it is typically less than a 20% effect. In the case of Abell 2199, no low energy excess is present in the ROSAT data. In the data taken with EUVE, however, the excesses range from 70% to 600%.

Type
Session 4: Large Scale Hot Plasmas and Their Relation with Dark Matter
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 185 - 188
Copyright
Copyright © Kluwer 1998 

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