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Common Features of the Optical Continua associated with Violent Cosmic Events

Searle, L. and Rodgers, A. W. and Sargent, W. L. W. and Oke, J. B. (1965) Common Features of the Optical Continua associated with Violent Cosmic Events. Nature, 208 (5016). pp. 1190-1191. ISSN 0028-0836. doi:10.1038/2081190a0.

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The purpose of this communication is to point out a similarity in the optical continua of several objects, all associated with violent events, but which otherwise have a diverse character. The objects are the nucleus of the Seyfert Galaxy NGC 4151, the galactic, nova-like object η Carinae, the Crab Nebula and the quasi-stellar radio source, 3C748. (The term nova-like is to some extent descriptive of the spectrum. In using it, we do not mean to imply a mechanism for the outburst in η Carinae. This outburst has involved energies characteristic of supernovae and, unlike either supernovae or novae, has a time scale of the order of a century.) The optical spectrum of NGC 4151 has been discussed by Seyfert and Woltjer, that of η Carinae by Thackeray, that of the Crab Nebula by Woltjer and Mayall, and that of 3C48 by Greenstein and Schmidt. The emission lines in all of these spectra show, as a common feature, evidence of internal motions as large as a few thousand km/sec. We indicate in Table 1 some of the principal observed features of these objects.

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Additional Information:© 1965 Nature Publishing Group. Work supported by the U.S. National Science Foundation.
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Issue or Number:5016
Record Number:CaltechAUTHORS:20190507-145524868
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95312
Deposited By: George Porter
Deposited On:07 May 2019 22:52
Last Modified:16 Nov 2021 17:11

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