Spectra of Weak Radio Sources
from the RATAN-600 Kholod Deep Survey

N. N. Bursov

Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Stavropol’skii krai, 357147 Russia

Received May 29, 1995

Abstract—A multifrequency deep survey of a band of sky with the declination of the source SS 433 ( 5 20)
was performed as part of the “Kholod” program on the RATAN-600 in 1987–1988. The right ascension inter-
vals covered by the survey are 0^h < < 14^h and 18^h < < 24^h. The spectral properties of 400 sources from the
RC catalog were determined for the first time by using only RATAN-600 data. The maximum in the flux density
distribution for these sources at the central wavelength, 7.6 cm, occurs at ~ 30 mJy. The lower flux limits for
the sample at wavelengths of 3.9, 7.6, 13.0, and 31.0 cm are 16, 9, 37, and 61 mJy, respectively. These obser-
vations provide the first flux estimates at 13.0 and 31.0 cm for 90% of the sources. Spectra were measured for
the first time for 112 sources (28%) and were revised for 90 sources (23%). The maximum in the spectral index
distribution for the entire sample in the interval from 7.6–31.0 cm occurs at = –0.86 ± 0.04 (S~).
Thespectra of some 20 of the sample sources (5%) are peaked at roughly 1 GHz, and about 40 spectra (10%)
have low-frequency breaks. Roughly 70 sources (19%) have flat spectra ( > –0.5), and 64 (18%) have very
steep spectra ( < –1.1).

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