613 citations · 4k across the 41 of their papers we have counts for
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On the nature of the z=0 X-ray absorbers: II. The contrast between local and AGN host galaxy absorption
Rik J. Williams, Smita Mathur, Fabrizio Nicastro
We search for highly-ionized gas near three AGN host galaxies using the Chandra low-energy transmission grating spectrograph. Strong absorption lines from such gas are seen at z=0,…
On the nature of the z=0 X-ray absorbers: I. Clues from an external group
Smita Mathur, Gregory R. Sivakoff, Rik J. Williams +1
Absorption lines of OVII at redshift zero are observed in high quality Chandra spectra of extragalactic sightlines. The location of the absorber producing these lines, whether from…
Lost Baryons at Low Redshift
Smita Mathur, Fabrizio Nicastro, Rik J. Williams
We review our attempts to discover lost baryons at low redshift with ``X-ray forest'' of absorption lines from the warm-hot intergalactic medium. We discuss the best evidence to da…