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Published March 15, 1984 | Published
Journal Article Open

Two Multifrequency Observations of 3C 371


We present observations of 3C 371, made at frequencies from the radio to the ultraviolet, which were coordinated during two short time intervals separated by 3 months. We also present 1 keV X-ray flux densities measured at a different time. The multifrequency measurements indicate spectral steepening at visual wavelengths, and that an extrapolation of the ultraviolet continuum falls below the X-ray data. We explain the infrared through X-ray data as relativistically beamed synchrotron self-Compton emission and derive source parameters for two possible models. Our ultraviolet spectra both show strong Lyɑ emission at the same redshift as weak optical emission lines reported previously. We favor production of these lines by recombination of gas after its ionization by the ultraviolet to X-ray continuum radiation. We tentatively identify C IV and N v absorption lines in one of our ultraviolet spectra, which, if real, suggest the presence of a hot (~ 3 x 10^5 K) gaseous halo in 3C 371.

Additional Information

© 1984 American Astronomical Society. Received 1983 June 9; accepted 1983 August 30. We thank Professor M. J. Rees and Dr. R. C. Puetter for enlightening discussions. Drs. P. Le Van, R. Puetter, and H. E. Smith are thanked for their assistance in the acquisition of the infrared data. We thank the IVE observatory staff for assistance in obtaining and reducing the IVE observations, particularly Dr. D. Klinglesmith for making available the Fahey-Klinglesmith software package. The IVE work was supported by NASA grant NAG 5-63, the Michigan radio astronomy by NSF grant AST 80-21250, the KPNO observations by the US Air Force Office of Scientific Research grant 81-0161, the Rosemary Hill Observatory measurements by NSF grant AST-8203926, the Caltech measurements by an NSF grant, and the Einstein Observatory work by NASA grant NAS-8-30753.

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Published - 1984ApJ___278__521W.pdf


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