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: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » 1511.0687

 Article overview


On the OVI Abundance in the Circumgalactic Medium of Low-Redshift Galaxies
Joshua Suresh ; Kate H. R. Rubin ; Rahul Kannan ; Jessica K. Werk ; Lars Hernquist ; Mark Vogelsberger ;
Date 2 Nov 2015
AbstractWe analyze the mass, temperature, metal enrichment, and OVI abundance of the circumgalactic medium (CGM) around $zsim 0.2$ galaxies of mass $10^9 M_odot <M_igstar < 10^{11.5} M_odot$ in the Illustris simulation. Among star-forming galaxies, the mass, temperature, and metallicity of the CGM increase with stellar mass, driving an increase in the OVI column density profile of $sim 0.5$ dex with each $0.5$ dex increase in stellar mass. Observed OVI column density profiles exhibit a weaker mass dependence than predicted: the simulated OVI abundance profiles are consistent with those observed for star-forming galaxies of mass $M_igstar = 10^{10.5-11.5} M_odot$, but underpredict the observed OVI abundances by $gtrsim 0.8$ dex for lower-mass galaxies. We suggest that this discrepancy may be alleviated with additional heating of the abundant cool gas in low-mass halos, or with increased numerical resolution capturing turbulent/conductive mixing layers between CGM phases. Quenched galaxies of mass $M_igstar = 10^{10.5-11.5} M_odot$ are found to have 0.3-0.8 dex lower OVI column density profiles than star-forming galaxies of the same mass, in qualitative agreement with the observed OVI abundance bimodality. This offset is driven by AGN feedback, which quenches galaxies by heating the CGM and ejecting significant amounts of gas from the halo. Finally, we find that the inclusion of the central galaxy’s radiation field may enhance the photoionization of the CGM within $sim 50$ kpc, further increasing the predicted OVI abundance around star-forming galaxies.
Source arXiv, 1511.0687
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