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Neutral Hydrogen in the Galactic Halo

Published online by Cambridge University Press:  25 April 2016

R. X. McGee  and
Lynette M. Newton
R. X. McGee
Affiliation:
Division of Radiophysics, CSIRO, Sydney
Lynette M. Newton
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Abstract

Observations of 21 cm HI emission-line profiles have been made in 34 directions from l= 172° through 0° to l=97° at high galactic latitudes and in 59 directions towards the LMC (b~ –33°) with the aim of detecting low-intensity halo features which may be compared with other element features of similar radial velocities detected by ultraviolet or optical absorption lines. Data are presented as spectra and tables of the parameters: radial velocities, line temperatures, halfwidths and column densities. Spectra of both low-intensity (halo) and high-intensity components are given for 48 positions in three tracks across the LMC.

Features near radial velocities –48 and +58 km s -1 are found in all the directions examined, whereas significant numbers of features grouped around average radial velocities + 112, +160 and +373 km s-1 (Isr) are found only in the directions of the LMC.

Using the HI column densities as references, we have estimated depletions in the abundances of calcium and sodium in the halo, spiral arms and the LMC disk. In one direction towards the LMC depletions in the halo features of carbon, nitrogen, oxygen, magnesium, aluminium, silicon and iron (from International Ultraviolet Explorer (IUE) satellite data) have also been estimated.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 3 , 1986 , pp. 358 - 385
Copyright
Copyright © Astronomical Society of Australia 1986

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