Optical identifications of flat-spectrum radio sources

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/113283· OSTI ID:6527605

Condon, J J; Condon, M A; Broderick, J J; Davis, M M

A complete sample of radio sources with S> or =0.3 Jy at 1400 MHz, +24/sup 0/ or =+0.5 are usually in empty fields. The lower limits that can be assigned to the radio-optical spectral indices ..cap alpha../sub RO/ of these sources are significantly higher than the median ..cap alpha../sub RO/ of the sources with flat high-frequency spectra, so the optical characteristics of the two classes of radio source are intrinsically different. The radio and optical fluxes of flat-spectrum QSO's appear to be correlated, at least when averaged over 10/sup 2/--10/sup 3/ yr.

• Research Organization: National Radio Astronomy Observatory, Edgemont Road, Charlottesville, Virginia 22901
• OSTI ID: 6527605
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 88:1; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COORDINATES
CORRELATIONS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
INTERFEROMETRY
QUASARS
RADIATIONS
SPECTRA
VISIBLE RADIATION