Neutral hydrogen in the haloes of the galaxy and the LMC

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hydrogen Clouds, Intergalactic Media, Magellanic Clouds, Milky Way Galaxy, Neutral Gases, Astronomical Catalogs, Galactic Radiation, Halos, Iue, Radial Velocity, Telescopes

Scientific paper

A new low-noise 21-cm line receiver installed on the Parkes 64-m telescope has led to the detection of the H I counterpart of ionized and neutral elements in the galactic halo. The observations show that very low-intensity H I exists in three regions at average LSR radial velocities of -40, +59 and +131 km s-1. Two additional groups of low-intensity H I features at heliocentric velocities of +197 and +360 km s-1 possibly indicate a similar halo around the Large Magellanic Cloud. Comparison of the column densities obtained by the UV observations with the IUE and the present H I observation show that O I in the halo is depleted by a factor between 2 and 10 compared to solar abundance, Al and Si are depleted by a factor of ⪉2 and Fe is close to the solar abundance. Ground-based data on Ca II show that it is depleted by factors of 4 to 3000.

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