Other
Scientific paper
Dec 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.208.1190s&link_type=abstract
Nature, Volume 208, Issue 5016, pp. 1190-1191 (1965).
Other
20
Scientific paper
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 Seyfert1 and Woltjer2, that of η Carinae by Thackeray3, that of the Crab Nebula by Woltjer4 and Mayall5, and that of 3C48 by Greenstein and Schmidt6. 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.
Rodgers Alexander W.
Sargent Wallace L. W.
Searle Leonard
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