The Inventory and Distribution of Baryons at Redshift z=0

Details The Inventory and Distribution of Baryons at Redshift z=0 The Inventory and Distribution of Baryons at Redshift z=0

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281....1s&link_type=abstract

The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb

Astronomy and Astrophysics

Astronomy

15

Scientific paper

I highlight some of the major issues critical to the inventory of baryons at redshift z = 0. Through a combination of theoretical predictions and UV/X-ray observations, astronomers have discovered that a substantial fraction of this matter resides in the intergalactic medium (IGM) at temperatures ranging from 104 K to 107 K. The IGM is almost certainly a multi-phase medium, with several sources of heating and ionization. Hubble and FUSE observations of low-redshift Ly-alpha and OVI absorbers can account for 40-50% of these low-z baryons, with perhaps 30-40% in the Ly-alpha forest and 5-10% in gas at 105-6 K seen in OVI. X-ray studies of OVII and OVIII absorption are beginning to show promise in detecting even hotter gas (106-7 K), but their utility is hindered by weak detections, uncertain metallicities, and ionization corrections. The observed ratio, N(HI)/N(OVI), typically ranges from 0.1-10. The kinematic association of the Ly-alpha and OVI absorption suggests that they may "double-count" a portion of the photoionized gas. Therefore, estimates of the baryon content in the IGM, in galaxies, and in higher-column density HI absorbers must be regarded as undetermined according to expectations of precision measurements.

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