Constraining Simulations Of The Whim With Observations Of The Low-redshift Igm

Details Constraining Simulations Of The Whim With Observations Of The Low-redshift Igm Constraining Simulations Of The Whim With Observations Of The Low-redshift Igm

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546011s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #460.11; Bulletin of the American Astronomical Society, Vol. 42, p.491

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Nearly half the baryons in the local universe remain unaccounted for. It is believed that a significant portion of these missing baryons exist in a diffuse, warm (105 - 107 K) phase that is difficult to observe. A crucial component to simulating this warm/hot intergalactic medium (WHIM) is a proper treatment of star formation, feedback, and chemical enrichment, processes that require the use of analytical models with many free parameters. We perform a large suite of cosmological simulations varying resolution, box size, and the numerous sub-grid physics parameters. We implement a new method for modeling the radiative cooling from heavy elements that is metallicity dependent and includes the heating from a redshift dependent radiation background. In order to find the optimum set of parameters, we create synthetic QSO sight lines from the simulation data to compare with observations of metal absorbers, such as OVI, in the low-redshift Lyman-alpha forest. We use these simulations to measure the covariance of temperature and metallicity, which is a key to estimating the fraction of baryons in the WHIM.

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