Mathematics – Logic
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.3702m&link_type=abstract
American Astronomical Society Meeting 208, #37.02; Bulletin of the American Astronomical Society, Vol. 38, p.112
Mathematics
Logic
Scientific paper
Cosmological hydrodynamic simulations predict that the low redshift universe comprises of a web of warm-hot intergalactic gas and galaxies, groups of galaxies and clusters form at dense knots in these filaments. Our own Galaxy being no exception is also expected to be surrounded by the warm-hot intergalactic medium, filling the Local Group. Some theoretical models also predict the existence of a hot halo of the Galaxy. With X-ray and FUV observations of extragalactic sources, we can probe the warm-hot gas through absorption lines of highly ionized elements. Indeed, Chandra, XMM and FUSE observations have detected z=0 absorption lines towards many sightlines. The debate that has emerged is over the interpretation of these observations: are the z=0 absorption systems from the halo of our Galaxy or from the extended Local Group environment? This has important implications for our understanding of the mass of the Local Group, the physical conditions in the intergalactic medium, the structure of the Galaxy and galaxy formation in general. I will present the current status of the debate and discuss our ongoing observing program aimed at understanding the z=0 absorption systems, with emphasis on an exceptionally high quality Chandra spectrum of the Mrk 421 sightline.
Mathur Smita
Nicastro Fabrizio
Williams Richard J.
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