| Original Articles |
|
|
|
|
Dependence of X-Ray Luminosity on Temperature for Groups and
Clusters with the Moving Median Statistics |
| CHEN Li |
| Department of Astronomy, Beijing Normal University, Beijing 100875 |
|
| Cite this article: |
|
CHEN Li 2002 Chin. Phys. Lett. 19 286-288 |
|
|
|
Abstract We re-analyse the relationship between the x-ray luminosity
(LX) and the temperature (T) of groups and clusters of galaxies, based on the largest sample of 40 groups and 188 clusters. We employ the moving median statistics for the data set, along with the proper linear regression. Our newly established LX-T relations for groups and clusters show no significant difference within statistical uncertainties,
yielding LX ∝ T2.79±0.01 (groups) and LX ∝ T2.54±0.004 (clusters). This also supports the hierarchical scenario of structure formation in which groups are simply the scale-down version of clusters. It is argued that the break in the LX-T relation on group scales detected in previous studies may suffer from sparse data sample and poor statistical methods.
|
| Keywords:
98.80.Bp
02.50.Cw
|
|
|
Published: 01 February 2002
|
|
| PACS: |
98.80.Bp
|
(Origin and formation of the Universe)
|
| |
02.50.Cw
|
(Probability theory)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
