Absolute Energy Distribution in the Optical Spectrum of 3C 273
- Creators
- Oke, J. B.
Abstract
The radio source 3C 273 has recently been identified with a thirteenth magnitude star-like object. The details are given by M. Schmidt in the preceding communication. Since 3C 273 is relatively bright, photoelectric spectrophotometric observations were made with the 100-in. telescope at Mount Wilson to determine the absolute distribution of energy in the optical region of the spectrum; such observations are useful for determining if synchrotron radiation is present. In the wave-length region between 3300 Å and 6000 Å measurements were made in 16 selected 50-Å bands. Continuous spectral scans with a resolution of 50 Å were also made. The measurements were placed on an absolute-energy system by also observing standard stars whose absolute energy distributions were known. The accuracy of the 16 selected points is approximately 2 per cent. The strong emission features found by Schmidt were readily detected; other very faint features not apparent on Schmidt's spectra may be present.
Additional Information
© Nature Publishing Group 1963.Additional details
- Eprint ID
- 95322
- DOI
- 10.1038/1971040b0
- Resolver ID
- CaltechAUTHORS:20190507-145525860
- Created
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2019-05-07Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field