Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20514217b&link_type=abstract
American Astronomical Society Meeting 205, #142.17; Bulletin of the American Astronomical Society, Vol. 37, p.375
Astronomy and Astrophysics
Astronomy
Scientific paper
The absorption by OVII and OVIII at zero redshift can be interpreted as a very extensive Local Group medium, whose baryonic mass is greater than that of the known galaxies. This result is model dependent, and for different assumptions, this gas could be a halo around the Milky Way, with a hot gas mass that is a fraction of the Milky Way mass. These two models, the Local Group and the Milky Way halo pictures make different predictions for the column of hot gas as a function of Galactic latitude and longitude. In the Local Group picture, the OVII column should be greatest along the Milky Way - M31 axis, and we test that prediction by XMM observations of OVII column densities toward several objects. We find no enhancement in the column density along the Milky Way - M31 axis, suggesting that the hot gas resides primarily in a Galactic halo of extent 50 kpc. Support for this program was provided by NASA.
Bregman Joel N.
Lloyd-Davies Ed
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