Mathematics – Logic
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..754r&link_type=abstract
Nature, vol. 260, Apr. 29, 1976, p. 754-759. NSF-supported research.
Mathematics
Logic
136
Absorption Spectra, Astronomical Photometry, Light Curve, Quasars, Radio Spectroscopy, Astronomical Models, Emission Spectra, Energy Distribution, Infrared Spectra, Optical Emission Spectroscopy, Photographic Recording, Red Shift, Stellar Luminosity
Scientific paper
The results of extensive photometric and spectroscopic observations of the BL Lacertae object AO 0235+164 made during the Nov. 1975 outburst, which reached a magnitude of V = 14.3, are reported. The spectrum has a strong and rich absorption-line redshift at z = 0.524 and a probable system at z = 0.852. Photometry between 0.36 and 21 micrometers and at 90 and 140 GHz showed a peak during this outburst comparable with the most luminous quasistellar objects, with most of the energy falling in the infrared. The shape of the infrared spectrum fluctuated during the outburst. The observations place severe constraints on models which explain the optical and infrared emission as synchrotron radiation. It is suggested that a not yet understood emission mechanism may be in operation, or that the source might not be at the cosmological distance indicated by its redshift.
Grasdalen Gary L.
Hintzen Paul
Kinman Thomas D.
Rieke George H.
Wills Beverley J.
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