| | |
| | |
Stat |
Members: 3645 Articles: 2'504'928 Articles rated: 2609
26 April 2024 |
|
| | | |
|
Article overview
| |
|
Weak Lensing Calibrated M-T Scaling Relation of Galaxy Groups in the COSMOS Field | Kimmo Kettula
; Alexis Finoguenov
; Richard Massey
; Jason Rhodes
; Henk Hoekstra
; James E. Taylor
; Patrícia F. Spinelli
; Masayuki Tanaka
; Olivier Ilbert
; Peter Capak
; Henry J. McCracken
; Anton M. Koekemoer
; | Date: |
16 Sep 2013 | Abstract: | The scaling between X-ray observables and mass for galaxy clusters and groups
is instrumental for cluster based cosmology and an important probe for the
thermodynamics of the intracluster gas. We calibrate a scaling relation between
the weak lensing mass and X-ray spectroscopic temperature for 10 galaxy groups
in the COSMOS field, combined with 55 higher mass clusters from the literature.
The COSMOS data includes HST imaging and redshift measurements of 46 source
galaxies per square arcmin, enabling us to perform unique weak lensing
measurements of low mass systems. Our sample extends the mass range of the
lensing calibrated M-T relation an order of magnitude lower than any previous
study, resulting in a power-law slope of 1.48$^{+0.13}_{-0.09}$. The slope is
consistent with the self-similar model, predictions from simulations, and
observations of clusters. However, X-ray observations relying on mass
measurements derived under the assumption of hydrostatic equilibrium have
indicated that masses at group scales are lower than expected. Both simulations
and observations suggest that hydrostatic mass measurements can be biased low.
Our external weak lensing masses provides the first observational support for
hydrostatic mass bias at group level, showing an increasing bias with
decreasing temperature and reaching a level of 30-50% at 1 keV. | Source: | arXiv, 1309.3891 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |