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Burbidge, E. M.

Publications and source records attributed to Burbidge, E. M..

At least 55 records · Page 3
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NASA NTRS1972

Compact extragalactic nonthermal sources.

Results of photometry, polarimetry, spectroscopy, and direct photography at visual wavelengths of four additional objects of the BL Lacertae type are reported together with infrared observations to 10 microns for one of them (OJ 287). The data indicate that these objects are compact sources of nonthermal continuum radiation. They are likely to be extragalactic, and their possible relationship to QSOs is discussed.

Strittmatter, P. A.↗
NASA NTRS1972

Spectroscopic observations of 22 quasi-stellar objects.

Spectroscopic observations of 22 QSOs are described, and redshifts of 20 are given. A corrected redshift for 3C 407 is included, and an error in that published for PKS 0226-038 is pointed out. The variability of the large-redshift 5C 2.56 is discussed. Lines of Si II have been found in OI 318.

Burbidge, E. M.↗
NASA NTRS1972

Redshifts of twenty radio galaxies.

Spectroscopic observations and redshifts of 20 radio galaxies obtained with the Lick 120-inch telescope are presented. Ten of the radio galaxies are from the 3C R catalog, and the remainder are from the 4C, 5C, Ohio, and Parkes catalogs. The reported results represent a continuation of Burbidge's (1970) previously published data.

Burbidge, E. M.↗
NASA NTRS1972

Optical observations of southern radio sources.

Spectrograms of a number of objects identified with southern radio sources have been obtained with the 60-inch telescope of the Inter-American Observatory at Cerro Tololo, Chile. Redshifts have been measured for 10 radio galaxies, and the spectroscopic features are listed. Direct photographs of some of the objects are described. Spectrograms of four stellar objects suggested as QSO identifications showed all objects to be galactic stars, including one recently suggested as an identification for PKS 1302-49 instead of NGC 4945.

Burbidge, E. M.↗
NASA NTRS1972

The peculiar extragalactic system NGC 6438.

The peculiarly interacting extragalactic system NGC 6438 has been investigated, and it is shown that the irregular component and the S0 component have about the same redshift velocity of +2400 km/sec. Hence, the large velocity differences originally reported by Sersic (1968) are not confirmed.

Burbidge, E. M.↗
NASA NTRS1972

The optical object identified with 3C 455.

It is shown that the optical object identified with 3C 455 is a quasi-stellar object with a redshift z = 0.543. The QSO is situated 23 sec northeast of the S0 galaxy NGC 7413, which has a redshift of 0.0332. It is pointed out that the discovery of the present object in a position so close to a galaxy is further evidence in favor of the existence of a physical association between 3C QSOs and bright galaxies.

Arp, H. C.↗
NASA NTRS1972

Optical spectra of compact objects.

On the basis of their optical spectra, compact objects are divided into three classes: (1) nonthermal objects including Seyfert nuclei, most N-type radio galaxies, and luminous Zwicky objects; (2) hot massive stars, and (3) stellar objects including some compact galaxies having only absorption line spectra. A variety of morphological forms exist among class (1) and (2) objects. Emission line spectra of quasars are reviewed and related to the physical conditions in the emitting regions.

Burbidge, E. M.↗
NASA NTRS1971

Apparent associations between bright galaxies and quasi-stellar objects.

A comparison of the spatial distribution of the 47 identified QSOs in the 3C and 3CR catalogs with the small-redshift galaxies contained in the Reference Catalog of Bright Galaxies shows that four QSOs with redshift in the range 0.5-1.4 are much closer to bright galaxies than would be expected if the 47 QSOs were distributed randomly. An extensive analysis of the distributions shows that the probability that this is a chance occurrence is less than 0.005. It is also shows that the radio-quiet QSO PHL 1226 lies very close to IC 1746 to which it appears to have a physical connection.

Burbidge, E. M.↗
NASA NTRS1971

G61-29, a helium emission-line star.

G61-29 is the first star discovered in which helium alone has been observed in emission. Three spectrograms of the star were obtained at the Lick 120-inch telescope. The most prominent spectral features in the blue region are the He I triplet lines at 4471, 4026, and 3889 A. All He I lines are extremely broad. The high proper motion of the star limits its maximum distance to about 200 pc or less if the star is gravitationally bound to the Galaxy.

Burbidge, E. M.↗
NASA NTRS1971

Optical spectra of quasi-stellar objects.

Account of the emission lines of QSOs, with discussion of the absorption-line spectra and an account of the optical continua. Attention is given to both radio-emitting and radio-quiet QSOs, since there appears to be no distinction in their optical spectra, and objects at all observed redshifts are included.

Burbidge, E. M.↗