Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..681m&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, Dec. 1981, p. 681-694.
Astronomy and Astrophysics
Astronomy
96
Bl Lacertae Objects, Elliptical Galaxies, Galactic Nuclei, Quasars, Astronomical Observatories, Astronomical Photometry, Astronomical Spectroscopy, Galactic Clusters, Galactic Evolution, Luminosity, Nebulae, Red Shift, Spectrophotometry
Scientific paper
Spectroscopic investigations were carried out at Lick Observatory, University of California, Santa Cruz of the galaxy components of quasi-stellar objects (QSO's), N systems, and BL Lac objects. Details of the data on these systems are presented, showing that the BL Lac and N systems typically have a luminous elliptical galaxy associated with them. The BL objects are located in giant elliptical galaxies, the luminosities of which are equal to that of the brightest cluster ellipticals. The N systems have spectra indicating they are active nuclei in ellipticals, but the luminosities of the galaxy components are about two magnitudes fainter than a first-ranked cluster elliptical. No convincing spectroscopic data is currently available to show that QSO's are located in galaxies of stars, even though a few were found to have a surrounding nebulosity. Upper limits to the brightness of any elliptical galaxies associated with QSO's indicate that if such galaxies do exist, they are typically at least two magnitudes fainter than a first-ranked cluster elliptical.
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