Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'487'895
Articles rated: 2609

28 March 2024
 
  » arxiv » 2008.04917

 Article overview


Constraints on precipitation-limited hot halos from massive galaxies to galaxy clusters
Priyanka Singh ; G. M. Voit ; Biman B. Nath ;
Date 11 Aug 2020
AbstractWe present constraints on a simple analytical model for hot diffuse halo gas, derived from a fit spanning two orders of magnitude in halo mass ($M_{500} sim 10^{12.5}-10^{14.5} M_{odot}$). The model is motivated by the observed prevalence of a precipitation limit, and its main free parameter is the central ratio of gas cooling timescale to free-fall timescale ($t_{ m cool}/t_{ m ff}$). Using stacked X-ray and thermal Sunyaev-Zel’dovich observations of the environments around massive galaxies, galaxy groups and clusters, we obtain the best-fitting model parameters. We find $t_{ m cool}/t_{ m ff} sim 50-110$, depending on the model extrapolation beyond the halo virial radius and possibly on biases present in the data-sets used in the fitting analysis. The model adequately describes the entire mass range, except for intermediate mass halos ($M_{500} sim 10^{13.5} M_{odot}$) which systematically fall below the model predictions. However, the best fits for $t_{ m cool}/t_{ m ff}$ substantially exceed the values typically derived from X-ray observations of individual systems ($t_{ m cool}/t_{ m ff} sim 10-30$). We consider several explanations for those discrepancies, including X-ray selection biases and a potential anti-correlation between X-ray luminosity and the central galaxy’s stellar mass.
Source arXiv, 2008.04917
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  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 claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica