Results 71 to 80 of about 166 (155)

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

Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-line Region

The Astrophysical Journal
The Baldwin effect—the inverse correlation between the equivalent width of emission lines and the continuum luminosity in active galactic nuclei (AGNs)—has been known for nearly five decades, yet its physical origin remains poorly understood.
Wen-Qiang Liang, Zhi-Fu Chen, Rui-Jing Lu, Cheng-Feng Peng, Shao-Hua Zhang, Zhe-Geng Chen, Zhi-Qing Chen, Yi-Qi Chen, Dong-Li Jiang, Xi-Heng Shi, Zhi-Wen Wang   +10 more
doaj   +1 more source

Infrared polarimetry of radio-quiet quasars

The Astrophysical Journal, 1988
The polarizations of eight radio-quiet quasars have been measured at 2.2 microns. Of these, three are marginally detected with polarizations of 1.5-2 percent, while the rest have upper limits of 1-1.5 percent. This indicates that if a significant fraction of the infrared emission in these objects is due to synchrotron radiation, then either the ...
openaire   +1 more source

FROM GALACTIC TO EXTRAGALACTIC JETS: A REVIEW

Acta Polytechnica, 2013
An analysis of the data that have recently become available from observing campaigns, including VLA, VLBA, and satellite instruments, shows some remarkable similarities and significant differences in the data from some epochs of galactic microquasars ...
James H. Beall
doaj   +1 more source

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

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

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

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

Observations of a Possible Transient Magnetically Arrested Accretion State in a Nearby Quasar: OQ 208

The Astrophysical Journal
OQ 208 is a nearby, partially obscured quasar ( z = 0.077) that is a young, bright, parsec-scale radio source. We assemble archival and new high-frequency Very Long Baseline Array (VLBA) and Very Large Array (VLA) observations and optical spectra to form
Brian Punsly, Cormac Reynolds, Paola Marziani, Gary J. Hill, Alexander B. Pushkarev, Carlo Stanghellini, Frank Schinzel, Christopher O’Dea, Gregory R. Zeimann, Andrew Biggs, Jian-Min Wang, Pu Du, Alberto Floris, Mauro D’Onofrio, Levi Malmstrom   +14 more
doaj   +1 more source

Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs. [PDF]

Sci Adv, 2022
He Z, Liu G, Wang T, Mou G, Green R, Bian W, Wang H, Ho LC, Sun M, Shen L, Arav N, Chen C, Wu Q, Guo H, Lin Z, Li J, Yi W.   +16 more
europepmc   +1 more source