Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..323w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 323-340.
Astronomy and Astrophysics
Astronomy
53
Milky Way Galaxy, Star Formation, Carbon Monoxide, H Ii Regions, Hydroxyl Emission, Infrared Sources (Astronomy), Radio Emission, Water Masers
Scientific paper
The authors have used the 100 m Effelsberg telescope to search for maser emission toward IRAS point sources in the neighbourhood of H II regions with galactocentric distances larger than 14 kpc. They found 15 H2O masers and 1 OH maser in the outer Galaxy and in addition 10 H2O masers and 1 OH maser in some other regions closer to the solar circle. Both the FIR luminosity distribution of sources in the outer Galaxy and the average number of FIR sources per H II region with LIR > 104L_sun; are the same as in the Perseus arm. This suggests that once star formation started, the process continues similarly as in a cloud located in a spiral arm. The amount of star formation per unit mass of H2 at R = 15 kpc is equal to that in the solar neighbourhood. Eight of the H II regions were observed with the VLA at 6 cm. The fields contain 18 radio sources, 9 of which are associated with an IRAS source.
Brand Jan
Henkel Carsten
Wouterloot Jan G. A.
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