The distribution of neutral atomic hydrogen in our galaxy beyond the solar circle
A. P. Henderson, P. D. Jackson, F. J. Kerr;
ApJ, 1982, 263, 116
ABSTRACT:A southern Milky Way neutral survey, designated P18, was conducted with the 18 m radio telescope at Parkes, NSW, Australia.
The survey covers
the range from 240 to 350 deg in galactic longitude and the range from -10 to
+10 deg in galactic latitude, with 2.1 km/s velocity resolution.
The
present investigation is concerned with the preliminary results on the
overall galactic distribution of H I.
Data from a survey of H I for l = 10 to 250 deg
conducted by Weaver and Williams (1973, 1974) is combined with P18 to provide
global galactic coverage.
Contour maps of the neutral hydrogen
distribution in the outer Galaxy are presented.
The presented contour maps offer a
good comparison of the two galactic hemispehres.
A lack of bilateral
symmetry in the surface density is observed.
The total H I mass in the Galaxy is
estimated to be 4.81 x 10 to the 9th solar masses, of which 81% lies beyond R = 11 kpc.
KEYWORDS: astronomical maps, hydrogen clouds, interstellar matter, mass distribution, milky way galaxy, neutral gases, hydrogen atoms, radial velocity, radio astronomy, radio sources (astronomy)
CODE: henderson82