Hydrostatic gas distributions: global estimates of temperature and abundance

Details Hydrostatic gas distributions: global estimates of temperature and abundance Hydrostatic gas distributions: global estimates of temperature and abundance

2008-04-10

arxiv.org/abs/0804.1632v1

Astronomy and Astrophysics

Astrophysics

14 pages, 7 figures, MNRAS, accepted

Scientific paper

10.1111/j.1365-2966.2008.13305.x

Estimating the temperature and metal abundance of the intracluster and the intragroup media is crucial to determine their global metal content and to determine fundamental cosmological parameters. When a spatially resolved temperature or abundance profile cannot be recovered from observations (e.g., for distant objects), or deprojection is difficult (e.g., due to a significant non-spherical shape), only global average temperature and abundance are derived. After introducing a general technique to build hydrostatic gaseous distributions of prescribed density profile in potential wells of any shape, we compute the global mass weighted and emission weighted temperature and abundance for a large set of barotropic equilibria and an observationally motivated abundance gradient. We also compute the spectroscopic-like temperature that is recovered from a single temperature fit of observed spectra. The derived emission weighted abundance and temperatures are higher by 50% to 100% than the corresponding mass weighted quantities, with overestimates that increase with the gas mean temperature. Spectroscopic temperatures are intermediate between mass and luminosity weighted temperatures. Dark matter flattening does not lead to significant differences in the values of the average temperatures or abundances with respect to the corresponding spherical case (except for extreme cases).

Affiliated with

Also associated with

No associations

Rating

Hydrostatic gas distributions: global estimates of temperature and abundance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hydrostatic gas distributions: global estimates of temperature and abundance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrostatic gas distributions: global estimates of temperature and abundance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-355688