The Mass and Size of the Hot Galactic Halo

Details The Mass and Size of the Hot Galactic Halo The Mass and Size of the Hot Galactic Halo

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..147b&link_type=abstract

XMM-Newton Proposal ID #05037502

Physics

Galaxies, Galactic Surveys, Eso 141- G 055, Eso 141- G 055, Xmm-Newton Proposal 05037502

Scientific paper

Absorption in the OVII (21.60 A) line at zero redshift shows the presence of hot gas. Our recent study, using 26 absorption sightlines, shows that this absorption is probably from a halo around the Milky Way rather than a Local Group medium. However, the size of the hot halo is poorly known (15-110 kpc) because there are no useful existing absorption sightlines across the Galactic bulge, which provide the strongest constraints. We propose a lengthy observation of the brightest known AGN in the direction of the Galactic bulge, where existing data indicate an absorption line of above average strength. The resulting equivalent width measurement will strongly constrain the size and mass of the hot halo.

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