Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...498l..17m&link_type=abstract
Astrophysical Journal Letters v.498, p.L17
Astronomy and Astrophysics
Astronomy
83
Galaxies: Clusters: General, Galaxies: Clusters: Individual Name: Abell 1795, X-Rays: Galaxies
Scientific paper
We have observed the rich cluster Abell 1795 for 90,000 s, using the deep survey telescope aboard the Extreme-Ultraviolet Explorer, with the Lex/B (69-190 eV) passband filter. Very luminous emission was detected, with a marked softening of the spectrum toward the limiting sensitivity radius of 10' (~0.67 Mpc, assuming here and thereafter a Hubble constant of 75 km s ^{-1} Mpc ^{-1} ), where the EUV intensity is 6 times higher than that expected from the low-energy tail of the thermal X-ray emission, and the resulting EUV luminosity (a model-independent quantity) exceeds that of the X-ray band. The consequence of a thermal model interpretation is the existence of a warm (sub-MK) intracluster gas that is dynamical (cooling times <=10 ^{-4} of a Hubble time) and that contains a significant fraction, perhaps all, of the total missing mass of the cluster. Alternative interpretations of the data also invoke assumptions that have significant ramifications in our understanding of clusters.
Lieu Richard
Lockman Felix J.
Mittaz Jonathan P. D.
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