NAOC Open IR
Testing the Universality of the TIS Model on Cluster Scales from the X-ray Surface Brightness Profiles
Zhang Yuying
2001
Source PublicationChinese Journal of Astronomy and Astrophysics
ISSN1009-9271
Volume1Issue:1Pages:29
AbstractThe truncated isothermal sphere (TIS) model has been recently suggested as an alternative for virialized dark halos (Shapiro et al. 1999). Both its profound theoretical motivation and its successful explanations for the galactic rotation curves and the gravitational scaling laws of clusters indicate that the TIS model is a promising candidate among other prevailing models such as the NFW profile and the Burkert profile. This promotes us to re-examine the universality of the TIS model on cluster scales from a different angle. Using an ensemble of X-ray surface brightness profiles of 45 clusters, we test the goodness of fit of the TIS predicted gas distributions to the X-ray data under the assumption of isothermal, hydrostatic equilibrium. Unlike the conventional beta model or the NFW/Burkert profile, for which about half of the clusters have the reduced chi (2)(v) values smaller than 2, the TIS model fails in the fitting of the X-ray surface brightness profiles of clusters in the sense that 38 out of the 45 clusters show chi (2)(v) > 2. This may constitute challenge for the universality of the TIS model unless the present analysis is seriously contaminated by other uncertainties including the negligence of non-gravitational heating processes and the unconventional sampling of the X-ray data.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/40747
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang Yuying. Testing the Universality of the TIS Model on Cluster Scales from the X-ray Surface Brightness Profiles[J]. Chinese Journal of Astronomy and Astrophysics,2001,1(1):29.
APA Zhang Yuying.(2001).Testing the Universality of the TIS Model on Cluster Scales from the X-ray Surface Brightness Profiles.Chinese Journal of Astronomy and Astrophysics,1(1),29.
MLA Zhang Yuying."Testing the Universality of the TIS Model on Cluster Scales from the X-ray Surface Brightness Profiles".Chinese Journal of Astronomy and Astrophysics 1.1(2001):29.
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