The Question of Quasi-Stellar Objects in Clusters of Galaxies and the Definitions of Quasi-Stellar Objects and Compact Galaxies

1970 ◽  
Vol 162 ◽  
pp. 811 ◽  
Author(s):  
Halton Arp
Keyword(s):  
Clusters Of Galaxies ◽  
Stellar Objects ◽  
Quasi Stellar Objects ◽  
Compact Galaxies

scholarly journals Classification of Compact Objects: QSS, QSOs, N-Type and Compact Galaxies, Seyfert and Galactic Nuclei

1972 ◽  
Vol 44 ◽  
pp. 97-103
Author(s):  
W. W. Morgan
Keyword(s):  
Galactic Nuclei ◽  
Seyfert Galaxy ◽  
Classification Criteria ◽  
Compact Objects ◽  
Stellar Objects ◽  
Quasi Stellar Objects ◽  
Compact Galaxies

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.

Are Some Quasi-Stellar Objects Associated with Clusters of Galaxies?

1969 ◽  
Vol 157 ◽  
pp. L77 ◽  
Author(s):  
John N. Bahcall ◽  
Maarten Schmidt ◽  
James E. Gunn
Keyword(s):  
Clusters Of Galaxies ◽  
Stellar Objects ◽  
Quasi Stellar Objects

scholarly journals A Master List of Non-Stellar Objects

1977 ◽  
Vol 35 ◽  
pp. 167-169
Author(s):  
ROBERT S. DIXON
Keyword(s):  
Globular Clusters ◽  
Reference Data ◽  
Clusters Of Galaxies ◽  
Stellar Objects ◽  
Readable Form ◽  
Practical Standpoint ◽  
Order Of Magnitude ◽  
Quasi Stellar Objects ◽  
Basic Reference ◽  
Scientists And Engineers

It has been nearly 70 years since Dreyer completed his famous NGC and IC compendia of all the 13,000 non-stellar objects known in his time. Since then, the number of these objects known has increased by an order of magnitude, but this knowledge is scattered throughout the astronomical literature in such a way that it 1s nearly inaccessible from a practical standpoint to any individual.The present work is an amalgamation of all known catalogs of non-stellar objects, in a uniform, easily readable form. It is Intended not only for astronomers, but also for scientists and engineers in other fields who have need for rapid access to this basic reference data. The types of objects included are galaxies (including both normal and all specialized types such as interacting, peculiar, dwarf, Seyfert, etc.), clusters of galaxies, nebulae of all kinds (planetary, reflection, emission, absorption, etc.), blue objects, groups of stars (open and globular clusters, associations, rings, chains, etc.), quasi-stellar objects, super-novae and others. The Information given for each object includes name, 1950.0 position, angular diameter in arcseconds, magnitude, description, and original reference. A portion of the work is shown in Figure 1. Approximately 185,000 listings appear in the full master 11st.

Relative Correlation of - and Small-Redshift Quasi-Stellar Objects with Clusters of Galaxies

1971 ◽  
Vol 166 ◽  
pp. L77 ◽  
Author(s):  
John N. Bahcall ◽  
Neta A. Bahcall ◽  
G. R. Burbidge
Keyword(s):  
Clusters Of Galaxies ◽  
Stellar Objects ◽  
Quasi Stellar Objects

The properties of the dusty inner regions of nearby QSOs

2019 ◽  
Vol 15 (S356) ◽  
pp. 95-95
Author(s):  
Itziar Aretxaga
Keyword(s):  
Star Formation ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Stellar Objects ◽  
X Ray ◽  
Mir Spectroscopy ◽  
Polycyclic Aromatic ◽  
Quasi Stellar Objects

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.

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