A 5 GHz VLA survey of the galactic plane

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Catalogs, H Ii Regions, Infrared Astronomy, Milky Way Galaxy, Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Tables (Data), Images, Infrared Astronomy Satellite, Star Formation, Very Large Array (Vla)

Scientific paper

We have used the Very Large Array (VLA) to survey the inner Galaxy (absolute value of b less than 0.4 deg, l = 350-40 deg) at 5 GHz to a limiting sensitivity of between 2.5 and 10 mJy. The survey has resulted in a catalog of 1272 discrete sources (including 100 sources outside the formal survey area) of which we have tentatively identified approximately 450 as ultracompact H II regions and approximately 45 as planetary nebulae. Approximately 30% of the radio sources are detected in the Infrared Astronomy Satellite (IRAS) Point source Catalog. The results confirm a scale height of only 30 pc for ultracompact H II regions. We show that source lists generated from the IRAS Point Source Catalog alone suffer serious selection effects; the combination of the IRAS and radio surveys allows us to produce a much more complete census of the regions of massive star formation in our Galaxy.

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