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Optical Identification of 3c 48, 3c 196, and 3c 286 with Stellar Objects.

1963; IOP Publishing; Volume: 138; Linguagem: Inglês

10.1086/147615

1538-4357

Thomas A. Matthews, Allan Sandage,

Stellar, planetary, and galactic studies

view Abstract Citations (590) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical Identification of 3C 48, 3C 196, and 3C 286 with Stellar Objects. Matthews, Thomas A. ; Sandage, Allan R. Abstract Radio positions of the three sources have been determined with the two 90-foot antennas working as an interferometer with an r.m.s. accuracy in both co-ordinates better than 10 seconds of arc. Direct photographs show that a starlike object exists within the error rectangle at each of the source positions. Exceedingly faint wisps of nebulosity are associated with the stars in 3C 48 and 3C 196. The observations are incomplete for 3C 286 in this regard. Photoelectric photometry of the stars shows each to have quite peculiar color indices, most closely resembling the colors of old novae or possibly white dwarfs, but we are not suggesting identification with these types of stars. Photometry of 3C 48 through 13 months shows the star to be variable by at least AV = 0W4. The radio flux appears to be constant. Optical spectra for 3C 48 show several very broad emission features, the most intense at X 3832 being unidentified. Spectra by Schmidt of 3C 196 and 3C 286 show other unusual features. The radio structure of the three radio stars is similar in that each has an unresolved core of 1.8 X 10 years. The synchrotron lifetime calculated in the normal manner is much shorter than that inferred from the extent of the faint nebulosity. Thus either the magnetic field must be much lower than calculated, or high-energy electrons must be supplied continuously. Publication: The Astrophysical Journal Pub Date: July 1963 DOI: 10.1086/147615 Bibcode: 1963ApJ...138...30M full text sources ADS | data products SIMBAD (10) NED (3)