A Systematic Search at 1612-MHZ for OH Maser Sources - Part Four - Type-II OH / Infrared Sources in the Central Region of the Galaxy

Details A Systematic Search at 1612-MHZ for OH Maser Sources - Part Four - Type-II OH / Infrared Sources in the Central Region of the Galaxy A Systematic Search at 1612-MHZ for OH Maser Sources - Part Four - Type-II OH / Infrared Sources in the Central Region of the Galaxy

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95..171b&link_type=abstract

Astronomy and Astrophysics, Vol. 95, P. 171, 1981

Astronomy and Astrophysics

Astrophysics

19

Scientific paper

We analyze 1612 MHz radio line observations of unidentified, Type II OH/IR sources at 14° ≧ l ≧ 358°. The results are compared with a similar analysis of observations for l ≧ 10°, and with the properties of planetary nebulae and the gaseous components of the nuclear region of the Galaxy.
The projected density of OH/IR sources decreases from l = 14° down to about l = 2°. It increases again for l < 2°. We conclude that the average space density of OH/IR sources is much smaller for galactocentric distances R <4 kpc than it is for 4 < R < 6 kpc. For R < 0.35 kpc there is some evidence for a nuclear bulge. No significant difference could be found between the OH/IR sources at the Galactic Centre and those with 4 < R < 6 kpc, except that near the centre the fraction of sources with small expansion velocities (<14 km s-1) appears to be higher.
The radial velocities of the OH/IR sources near the Galactic Centre differ considerably from predictions by theories of galactic rotation. The distribution of radial velocities for l <5° has a total width of 360 km s-1 and is centred at V ≍ 0 km s-1.
We conclude that the star formation rate for 0.35 < R < 4.5 kpc has been low for the last 109 yr. Within 0.35 kpc from the Centre star formation apparently continued.

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