Results 71 to 80 of about 719 (181)

A powerful (and likely young) radio-loud quasar at z=5.3 [PDF]

, 2022
S. Belladitta, A. Moretti, A. Caccianiga, D. Dallacasa, C. Spingola, M. Pedani, L. P. Cassarà, S. Bisogni   +7 more
openalex   +1 more source

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

Evidence of Gas Depletion in Quasars with Moderate Radio Emission

The Astrophysical Journal
The energy released by active galactic nuclei (AGNs) is considered to have a profound impact on the cold gas properties of their host galaxies, potentially heating or removing the gas and further suppressing star formation.
Yuhan Wen, Ran Wang, Luis C. Ho, Jinyi Shangguan, Ezequiel Treister, Guodong Li, Franz E. Bauer   +6 more
doaj   +1 more source

Intra-night Optical Variability and Radio Characteristics of Extremely Radio-loud Narrow-line Seyfert 1 Galaxies

The Astrophysical Journal
Narrow-line Seyfert 1 galaxies (NLS1s) are generally known to be radio-quiet active galactic nuclei, but a tiny subset of them are found to be extremely radio-loud with radio loudness parameter ( R _1.4 GHz ) > 100.
Veeresh Singh, Parveen Kumar, Avik Kumar Das, Vineet Ojha   +3 more
doaj   +1 more source

Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry

The Astrophysical Journal, 2023
We explored the parsec-scale nuclear regions of a sample of radio-loud narrow-line Seyfert 1 galaxies (NLSy1s) using the VLBI Exploration of Radio Astrometry wideband (at a recording rate of 16 Gbps) polarimetry at 22 and 43 GHz.
Mieko Takamura, Kazuhiro Hada, Mareki Honma, Tomoaki Oyama, Aya Yamauchi, Syunsaku Suzuki, Yoshiaki Hagiwara, Monica Orienti, Filippo D’Ammando, Jongho Park, Minchul Kam, Akihiro Doi   +11 more
doaj   +1 more source

The Hosts Galaxies of Radio-Loud and Radio-Quiet Quasars

, 2001
Latex, 10 pages, including 6 postscript figures.
openaire   +2 more sources

Radio-loud and radio-quiet BAL quasars: a detailed ultraviolet comparison [PDF]

Monthly Notices of the Royal Astronomical Society, 2014
9 pages, 6 figures, 2 tables.
Rochais, Thomas B., DiPompeo, Michael A., Myers, Adam D., Brotherton, Michael S., Runnoe, Jessie C., Hall, Shannon W.   +5 more
openaire   +2 more sources

Are Radio-Loud Quasars Rebellious or are Radio-Quiets Just Plain Untalented? [PDF]

International Astronomical Union Colloquium, 1997
AbstractWe present some of the results of a preliminary statistical study of 20 QSOs. We compare equivalent widths and widths at 40–80% of flux maximum of the Lyα, Si IVλ1400, C IV λ1549, and C III] λ1909 lines between radio-loud and radio-quiet QSO subsamples and with previously reported findings.
Vestergaard, M., Wilkes, B. J., Barthel, P.   +2 more
openaire   +2 more sources

Probing the Low-radio-frequency Emission in PG Quasars with the uGMRT. II

The Astrophysical Journal Supplement Series
We present results from uGMRT 685 MHz observations of 87 QSOs belonging to the Palomar–Green (PG) quasar sample with z  
Sanna Gulati, S. Silpa, P. Kharb, Luis C. Ho, S. Ghosh, J. Baghel   +5 more
doaj   +1 more source

The relationship between the emission line, continuum luminosity, and Baldwin effect in blazars

Astronomy & Astrophysics
Aims. This study investigates the relationship between the Mg II λ2798 Å emission line and the 3000 Å continuum luminosity, as well as the Baldwin effect, in a sample of 40’,685 radio-quiet (RQ) quasars and 441 flat spectrum radio quasars (FSRQs ...
Patiño-Álvarez Víctor M., Guerrero-González Jonhatan U., Chavushyan Vahram, Monjardin-Ward Douglas E., Arshakian Tigran G., Cruz-González Irene   +5 more
doaj   +1 more source