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Diffuse X-ray emission from the NGC 2300 group of galaxies - Implications for dark matter and galaxy evolution in small groupsThe discovery of diffuse X-ray emission from the NGC 2300 group of galaxies using the ROSAT Position Sensitive Proportional Counter is reported. The gas distributions is roughly symmetric and extends to a radius of at least 0.2/h(50) Mpc. A Raymond-Smith hot plasma model provides an excellent fit the X-ray spectrum with a best-fit value temperature of 0.9 + -/15 or - 0.14 keV and abundance 0.06 + 0/.12 or - 0.05 solar. The assumption of gravitational confinement leads to a total mass of the group of 3.0 + 0.4 or - 0.5 x 10 exp 13 solar. Baryons can reasonably account for 4 percent of this mass, and errors could push this number not higher than 10-15 percent. This is one of the strongest pieces of evidence that dark matter dominates small groups such as this one. The intragroup medium in this system has the lowest metal abundance yet found in diffuse gas in a group or cluster.
Document ID
19930041444
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mulchaey, John S.
(Space Telescope Science Inst. Baltimore, MD, United States)
Davis, David S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mushotzky, Richard F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Burstein, David
(Arizona State Univ. Tempe, United States)
Date Acquired
August 16, 2013
Publication Date
February 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 404
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A25441
Distribution Limits
Public
Copyright
Other

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