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Lost Baryons at Low Redshift

Published online by Cambridge University Press:  01 June 2007

Smita Mathur ,
Fabrizio Nicastro  and
Rik Willimas
Smita Mathur
Affiliation:
Astronomy Department, The Ohio State University, Columbus, OH 43210 email: [email protected]
Fabrizio Nicastro
Affiliation:
OAR-INAF, Rome, Italy
Rik Willimas
Affiliation:
Leiden University, Netherlands
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Abstract

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We review our attempts to discover lost baryons at low redshift with the “X-ray forest” of absorption lines from the warm-hot intergalactic medium. We discuss the best evidence to date along the Mrk 421 sightline. We then discuss the missing baryons in the Local Group and the significance of the z = 0 absorption systems in X-ray spectra. We argue that the debate over the Galactic vs. extragalactic origin of the z = 0 systems is premature as these systems likely contain both components. Observations with next generation X-ray missions such as Constellation-X and XEUS will be crucial to map out the warm-hot intergalactic medium.

Keywords

atomic processesGalaxy: formationintergalactic mediumquasars: absorption linesLocal Groupcosmology: observationsX-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 35 - 43
Copyright
Copyright © International Astronomical Union 2008

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