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Record Details

Record 60 of 10730
The dark matter distribution of M87 and NGC 1399
External Online Source: doi:10.1086/186959
Author and Affiliation:
Tsai, John C.(NASA Ames Research Center, Moffett Field, CA, United States)
Abstract: Recent X-ray observations of clusters of galaxies indicate that, outside the innermost about 100 kpc region, the ratio of dark matter density to baryonic matter density declines with radius. We show that this result is consistent with a cold dark matter simulation, suggesting the presence of dissipationless dark matter in the observed clusters. This is contrary to previous suggestions that dissipational baryonic dark matter is required to explain the decline in the density ratio. The simulation further shows that, in the inner 100 kpc region, the density ratio should rise with radius. We confirm this property in M87 and NGC 1399, which are close enough to allow the determination of the density ratio in the required inner region. X-ray mappings of the dark matter distribution in clusters of galaxies are therefore consistent with the presence of dissipationless dark matter.
Publication Date: Aug 20, 1993
Document ID:
19930071091
(Acquired Dec 28, 1995)
Accession Number: 93A55088
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 413; 2; p. L59-L62.
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: DARK MATTER; ELLIPTICAL GALAXIES; GALACTIC CLUSTERS; GAS DENSITY; SPACE DENSITY; X RAY ASTRONOMY; ASTRONOMICAL MODELS; BARYONS
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters vol. 413, no. 2 p. L59-L62. Aug. 20, 1993
Miscellaneous Notes: Research supported by National Research Council
Availability Source: Other Sources
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