A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe.

Details A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe. A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe.

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10211m&link_type=abstract

HST Proposal ID #10211

Mathematics

Logic

Hst Proposal Id #10211 Quasar Absorption Lines/Igm

Scientific paper

The main reservoir of low redshift baryons is still ``missing'': All the observed stellar and gaseous components add up to a factor of ten below the abundance predicted by big bang nucleosynthesis. Hydrodynamic cosmological simulations predict that a large fraction of the low redshift baryons should reside in a warm/hot diffuse intergalactic medium {IGM}, detectable via an ``X-ray forest'' of high excitation metal lines, but blind searches of X-ray lines are extraordinarily difficult with present technology. A first hint of this warm-hot IGM may have been found in recent studies of OVI absorption towards background quasars. However, the significance of OVI absorbers to the total baryon budget is uncertain and UV observations alone cannot determine the physical conditions in the IGM. We propose STIS/E140M observations to search for intervening OVI absorbers towards two quasars that are bright enough in X-rays for follow-up Chandra spectroscopy. The combined UV/X-ray study provides a powerful tool to {1} assess the cosmological significance of OVI absorbers; {2} determine their physical properties using OVII/OVI and OVIII/OVI ratios; and {3} pursue detection and study of the warm-hot IGM.

Affiliated with

Also associated with

No associations

Rating

A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe. 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 A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Combined HST/Chandra Study for Finding the Baryons in the Low Redshift Universe. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1011107