The distribution and nature of small-diameter radio sources along the southern galactic plane

Details The distribution and nature of small-diameter radio sources along the southern galactic plane The distribution and nature of small-diameter radio sources along the southern galactic plane

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..251w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 251-257.

Astronomy and Astrophysics

Astronomy

18

Density Distribution, H Ii Regions, Interstellar Matter, Milky Way Galaxy, Radio Sources (Astronomy), Astronomical Catalogs, Continuous Radiation, Planetary Nebulae

Scientific paper

A catalog of 1800 small-diameter radio sources has been compiled in the galactic longitude range 257-270 and 282-299 deg using the Molonglo Observatory Synthesis Telescope at 843 MHz. A complete sample drawn from this catalog has 360 sources in an area of 54 sq deg to a limiting flux density of 50 mJy. A comparison between the source density in this sample and the background extragalactic source density, determined from an investigation of a 33 sq deg region away from the plane, has revealed a galactic source density of 1.4 +/- 0.6/sq deg above 50 mJy. This galactic component, accounting for 20 percent of the small-diameter sources with S(843 MHz) greater than 50 mJy, is dominated by sources with diameters smaller than 16 arcsec. Comparisons with the IRAS Point Source Catalog show that compact H II regions, identified by their IR/radio flux density ratios and IR colors, account for more than 20 percent of the galactic component and, along with planetary nebulae, probably make up the bulk of this component.

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