The galaxy components of BL Lacertae objects, N systems, and quasi-stellar objects

1981 ◽  
Vol 93 ◽  
pp. 681 ◽  
Author(s):  
J. S. Miller
Keyword(s):  
Bl Lacertae Objects ◽  
Stellar Objects ◽  
Bl Lacertae ◽  
The Galaxy ◽  
Quasi Stellar Objects

Absorption by neutral hydrogen and ionized magnesium in quasi-stellar objects and BL Lacertae objects

1977 ◽  
Vol 218 ◽  
pp. 605 ◽  
Author(s):  
B. M. Peterson ◽  
P. A. Strittmatter ◽  
R. E. Williams ◽  
G. D. Coleman
Keyword(s):  
Neutral Hydrogen ◽  
Bl Lacertae Objects ◽  
Stellar Objects ◽  
Ionized Magnesium ◽  
Bl Lacertae ◽  
Quasi Stellar Objects

scholarly journals Quasars at intermediate redshift are not special; but they are often satellites

2021 ◽  
Vol 504 (1) ◽  
pp. 857-870
Author(s):  
Shadab Alam ◽  
Nicholas P Ross ◽  
Sarah Eftekharzadeh ◽  
John A Peacock ◽  
Johan Comparat ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Dark Matter Halo ◽  
Stellar Objects ◽  
The Galaxy ◽  
Quasi Stellar Objects ◽  
Satellite Galaxies ◽  
Emission Line Galaxies ◽  
Galaxy Population ◽  
Red Galaxies

ABSTRACT Understanding the links between the activity of supermassive black holes (SMBHs) at the centres of galaxies and their host dark matter haloes is a key question in modern astrophysics. The final data release of the SDSS-IV eBOSS provides the largest contemporary spectroscopic sample of galaxies and quasi-stellar objects (QSOs). Using this sample and covering the redshift interval z = 0.7–1.1, we have measured the clustering properties of the eBOSS QSOs, emission-line galaxies (ELGs), and luminous red galaxies (LRGs). We have also measured the fraction of QSOs as a function of the overdensity defined by the galaxy population. Using these measurements, we investigate how QSOs populate and sample the galaxy population, and how the host dark-matter haloes of QSOs sample the underlying halo distribution. We find that the probability of a galaxy hosting a QSO is independent of the host dark matter halo mass of the galaxy. We also find that about 60 per cent of eBOSS QSOs are hosted by LRGs and about 20–40 per cent of QSOs are hosted by satellite galaxies. We find a slight preference for QSOs to populate satellite galaxies over central galaxies. This is connected to the host halo mass distribution of different types of galaxies. Based on our analysis, QSOs should be hosted by a very broad distribution of haloes, and their occurrence should be modulated only by the efficiency of galaxy formation processes.

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.

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.

On the Space Distribution of Identified Quasi-stellar Objects and Radiogalaxies

Nature ◽  
1967 ◽  
Vol 216 (5113) ◽  
pp. 351-352 ◽  
Author(s):  
G. R. BURBIDGE ◽  
F. HOYLE
Keyword(s):  
Space Distribution ◽  
Stellar Objects ◽  
Quasi Stellar Objects

Nature of strong radio emission from quasi-stellar objects

1964 ◽  
Vol 9 (2) ◽  
pp. 138-139 ◽  
Author(s):  
L. Gold ◽  
J.W. Moffat
Keyword(s):  
Radio Emission ◽  
Stellar Objects ◽  
Quasi Stellar Objects
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