Results 91 to 100 of about 771 (176)

On the Cosmological Evolution of Radio Quiet and Radio Loud Quasars [PDF]

Symposium - International Astronomical Union, 1996
This contribution gives further insight into the problem of an ‘evolution’ of the function G(> R) [R is the ratio between radio and optical luminosity of a QSO] suggested by Visnovsky et al.(1992,ApJ,391,560), and recently by Schmidt et al.(1995,AJ,109,473). Using the Optical Luminosity Function for optically selected quasars derived by Boyle et al.(
openaire   +1 more source

Radio Emission from Broad Absorption Line Quasars

The Astrophysical Journal
Broad Absorption Line Quasars (BALQs) generally exhibit significant outflows that may interact with the surrounding medium, resulting in radio emission.
Sina Chen, Ehud Behar, Ari Laor, Nahum Arav   +3 more
doaj   +1 more source

Jets, black holes and disks in blazars

EPJ Web of Conferences, 2013
The Fermi and Swift satellites, together with ground based Cherenkov telescopes, has greatly improved our knowledge of blazars, namely Flat Spectrum Radio Quasars and BL Lac objects, since all but the most powerful emit most of their electro–magnetic ...
Ghisellini Gabriele
doaj   +1 more source

Further evidence for intra-night optical variability of radio-quiet quasars [PDF]

, 2007
Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with good statistical significance ...
Anupama, G. C., Ram, Sagar, Gopal-Krishna,, Sahu, D. K., Arti, Goyal   +4 more
core   +1 more source

Spectral Variability in Radio-Loud Quasars

, 2014
The spectral variability of a sample of 44 Flat-Spectrum Radio Quasars (FSRQs) and 18 Steep-Spectrum Radio Quasars (SSRQs) in SDSS stripe 82 region is investigated. Twenty-five of 44 FSRQs show a bluer-when-brighter trend (BWB), while only one FSRQ shows
Gu, Minfeng
core  

IRAS observations of radio-quiet and radio-loud quasars

The Astrophysical Journal, 1984
Observations from 12 to 100 microns are presented of two radio-quiet and three radio-loud quasars. Over this wavelength range, all five have grossly similar continuum energy distributions. The continua of the radio-loud quasars are consistent with synchrotron radiation.
Neugebauer, G., Soifer, B.T., Miley, G.K., Habing, H.J., Young, E., Low, F.J., Beichman, C.A., Clegg, P.E., Harris, S., Rowan-Robinson, M.   +9 more
openaire   +3 more sources

Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]

Sci Adv, 2023
Shen L, Liu G, He Z, Zakamska NL, Glikman E, Greene JE, Hu W, Mou G, Wylezalek D, Rupke DSN.   +9 more
europepmc   +1 more source

Constraining the radio-loud fraction of quasars at z > 5.5 [PDF]

, 2015
Radio-loud active galactic nuclei at z∼ 2-4 are typically located in dense environments and their host galaxies are among the most massive systems at those redshifts, providing key insights for galaxy evolution.
Rix, H., Flewelling, J., rix, h.-w., Venemans, B.P., Wainscoat, R.J., Venemans, B., Decarli, R., Kaiser, N., Walter, F., Burgett, W.S., Farina, E., Farina, E.P., Morganson, E., Tonry, J., DECARLI, ROBERTO, Fan, X., Hodge, J., Stern, D., Wainscoat, R., Draper, P., Tonry, J.L., Metcalfe, N., Morgan, J., Chambers, K., Draper, P.W., Schlafly, E., Chambers, K.C., Morgan, J.S., Greiner, J., Bañados, E., Burgett, W.   +30 more
core   +1 more source

Radio Scrutiny of the X-Ray-weak Tail of Low-mass Active Galactic Nuclei: A Novel Signature of High-Eddington Accretion?

The Astrophysical Journal
The supermassive black holes ( M _BH ∼ 10 ^6 –10 ^10 M _⊙ ) that power luminous active galactic nuclei (AGNs), i.e., quasars, generally show a correlation between thermal disk emission in the ultraviolet (UV) and coronal emission in hard X-rays.
Jeremiah D. Paul, Richard M. Plotkin, W. N. Brandt, Christopher H. Ellis, Elena Gallo, Jenny E. Greene, Luis C. Ho, Amy E. Kimball, Daryl Haggard   +8 more
doaj   +1 more source

Differential evolution of radio quiet and radio loud quasars

The Astronomical Journal, 1995
We have observed 40 optically selected high-redshift quasars with the Very Large Array (VLA) at 1515 MHz (20 cm). Three quasars are detected above our 3 sigma limit of 0.2 mJy. We review all available evidence on radio detections of optically selected quasars in terms of their ratio R of radio to optical luminosity.
Maarten Schmidt, J. H. van Gorkom, Donald P. Schneider, James E. Gunn   +3 more
openaire   +1 more source