UV And X-ray Observations Of Local Warm-hot Gas

Details UV And X-ray Observations Of Local Warm-hot Gas UV And X-ray Observations Of Local Warm-hot Gas

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1846w&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.46; Bulletin of the American Astronomical Society, Vol. 38, p.389

Astronomy and Astrophysics

Astronomy

Scientific paper

The recent detection with Chandra of two warm-hot intergalactic medium (WHIM) filaments toward Mrk 421 by Nicastro et al. provides a measurement of the bulk of the "missing baryons" in the nearby universe, confirming the predictions of past hydrodynamic simulations. Since galaxies are expected to primarily form within this cosmic web at all redshifts, we might thus expect that our own Galaxy is surrounded by the WHIM as well. Indeed, high-quality far-UV and X-ray spectra of background quasars show highly ionized absorption at a redshift consistent with zero in several directions. The origin of this absorption is nonetheless contentious: while it is often presumed to arise locally as a Galactic corona or fountain, there are indications that it could actually extend to megaparsec scale distances and comprise some of the local WHIM. I will present the results of our detailed analysis of three sightlines for which high-quality Chandra and FUSE data exist. Coupling these data with curve-of-growth and ionization balance models, we show that the local absorption is consistent with the local WHIM (though a Galactic origin cannot be ruled out) by placing limits on the gas temperature and density. We also investigate the connection of the highly-ionized X-ray absorption lines to lower-ionization states seen with FUSE.

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