Absorption in the spectra of quasi-stellar objects and BL Lacertae objects

1978 ◽  
Vol 90 ◽  
pp. 337 ◽  
Author(s):  
J. J. Perry ◽  
E. M. Burbidge ◽  
G. R. Burbidge
1977 ◽  
Vol 218 ◽  
pp. 605 ◽  
Author(s):  
B. M. Peterson ◽  
P. A. Strittmatter ◽  
R. E. Williams ◽  
G. D. Coleman

2019 ◽  
Vol 15 (S356) ◽  
pp. 95-95
Author(s):  
Itziar Aretxaga

AbstractWe present MIR spectroscopy and photometry obtained with CanariCam on the 10.4 m Gran Telescopio CANARIAS for a sample of 20 nearby, MIR bright and X-ray luminous quasi-stellar objects (QSOs). We find that for the majority of QSOs the MIR emission is unresolved at angular scales ∼0.3 arcsec. We derive the properties of the dusti tori that surround the nucleus based on these observations and find significant differences in the parameters compared with a sample of Seyfert 1 and 2 nuclei. We also find evidence for polycyclic aromatic hydrocarbon (PAH) features in the spectra, indicative of star formation, more centrally peaked (on scales of a few hundred pc) than previously believed.


1972 ◽  
Vol 44 ◽  
pp. 97-103
Author(s):  
W. W. Morgan

Some methods currently in use for the classification of the optical forms of the ‘compact’ galaxies and quasi-stellar objects are reviewed. It is shown that the category ‘Seyfert Galaxy’ is basically a spectroscopic (rather than a form) classification.An optical form-classification is described which is, in principle, identical with published classification criteria for QSO, N-type, and compact objects. The importance of maintaining rigid form-standards is emphasized.


Nature ◽  
1967 ◽  
Vol 216 (5113) ◽  
pp. 351-352 ◽  
Author(s):  
G. R. BURBIDGE ◽  
F. HOYLE

1964 ◽  
Vol 9 (2) ◽  
pp. 138-139 ◽  
Author(s):  
L. Gold ◽  
J.W. Moffat

2015 ◽  
Vol 217 (1) ◽  
pp. 5 ◽  
Author(s):  
J.-K. Krogager ◽  
S. Geier ◽  
J. P. U. Fynbo ◽  
B. P. Venemans ◽  
C. Ledoux ◽  
...  

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