High-sensitivity 7.6-cm RATAN-600 observations of a giant H II region in Sagittarius

Astronomy and Astrophysics – Astronomy

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Centimeter Waves, H Ii Regions, Interstellar Gas, Milky Way Galaxy, Radio Sources (Astronomy), Astronomical Catalogs, Background Radiation, Brightness Distribution, Radio Telescopes

Scientific paper

A 7.6-cm survey of the field alpha = 17 h 30 m - 19 h 30 m, delta = -(25 deg 30 arcmin - 22 deg 30 arcmin) (1950.0) at longitudes l = 4-10 deg in the Milky Way yields a catalog of 63 radio sources in the giant H II region there, with positions, flux densities, and angular sizes. Forty-four small-size objects have P less than 1 Jy. The radio brightness distribution of the galactic background component is determined; a weak background spans more than 12 deg in latitude b. The weak sources discovered in this survey form a higher-b population within the galactic plane than do the strong galactic sources; they appear to be accompanied by a faint extended radio background.

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