Very Low H I Column Densities in the Halo

Details Very Low H I Column Densities in the Halo Very Low H I Column Densities in the Halo

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1919y&link_type=abstract

IUE Proposal ID #GHGDY

Physics

Scientific paper

We propose to determine upper limits to H I column densities toward four halo dwarf stars that are more than 1 kpc away. Our objective is to find the frequency of pathlengths through the halo with N(HI) < 10^18cm^-2. If such low column densities can be found, it will have important implications for design of future Far UV instruments (FUSE), since it means such an instrument should be designed with significant spectroscopic ability at lambda < 912A. Such low H I column densities would also imply the existence of tunnels through which UV radiation from the disk could escape into the halo. Such leaking radiation could easily dominate the halo radiation field: the leaking radiation sets the upper limits to the unknown photoionization rate at lambda < 912A in the galactic halo. Finally, the path lengths with minimum H I are the directions along which direct measurements of the UV background radiation from QSO's, galaxies, or decaying neutrinos should be searched for.

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