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Published April 1969 | Published
Journal Article Open

Spectrophotometry and Infrared Photometry of BL Lacertae


The absolute spectral-energy distribution of BL Lacertae from 0.315 to 2.2 μ indicates that the optical radiation might be a continuation of the observed radio synchrotron flux. The very steep slope of the spectral-energy distribution suggests that the object is not a quasi-stellar radio source. Only one very faint spectral feature may exist, and no redshift can be derived.

Additional Information

© 1969 The University of Chicago. Received February 17, 1969. We thank Dr. Wallace Sargent for calling our attention to BL Lac, and Mr. Gary Tuton for assistance in making the 200-inch observations. This research was supported by grant NGL 05-002-007 from the National Aeronautics and Space Administration. The multichannel spectrometer and auxiliary equipment were provided by grant DA-ARO-D-31-124-G705 of the Advanced Research Projects Agency.

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Published - 1969ApJ___156L__41O.pdf


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