Results 81 to 90 of about 10,418 (177)

Investigating Differences in the Palomar-Green Blazar Population Using Polarization

The Astrophysical Journal
We present polarization images with the Karl G. Jansky Very Large Array (VLA) in A- and B-array configurations at 6 GHz of seven radio-loud (RL) quasars and eight BL Lac objects belonging to the Palomar-Green (PG) “blazar” sample.
Janhavi Baghel, P. Kharb, T. Hovatta, Luis C. Ho, C. Harrison, E. Lindfors, Silpa S., S. Gulati   +7 more
doaj   +1 more source

The environment of active objects in the nearby universe

, 2002
We study the galaxy environment of active galaxies, radio-loud and radio-quiet quasars in the redshift range $0.1\leq z\leq0.25$. We use APM galaxies in order to explore the local galaxy overdensity and the $b_J-R$ colour distribution of neighbouring ...
Abell, Babul, Barrow, Baugh, Best, Diego G. Lambas, Dressler, Ebeling, Fisher, Georgina V. Coldwell, Héctor J. Martínez, Lilje, Martínez, McLure, Rees, Schechter, Silk, Smith, Toomre, Voit, Véron-Cetty, Wold, Wold, Yee, Yee   +24 more
core   +2 more sources

Multiband Comparative Study of Optical Microvariability in RL vs. RQ Quasars [PDF]

, 2009
We present the results of an optical multi-band (BVR) photometric monitoring program of 22 core-dominated radio-loud quasars (CRLQs) and 22 radio-quiet quasars (RQQs). The aim was to compare the properties of microvariability in both types of quasars. We
A. Ramírez, Barbieri, Blundell, Blundell, Blundell, Carini, Carini, Carini, Cellone, Chavushyan, Clements, D. Dultzin, Dai, de Diego, Eggers, Enya, Enya, Falcke, Fanti, George, Gopal-Krishna, Gopal-Krishna, Guibin, J. A. de Diego, J.-N. González-Pérez, Kidger, Mantovani, Marscher, Qian, Schramm, Stepanian, Tornikoski, Vanden Berk, Webb, Wiita, Xie   +35 more
core   +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

The Relationship between Mg ii Broad Emission and Quasar Inclination Angle

Frontiers in Astronomy and Space Sciences, 2017
Several observed spectral properties of quasars are believed to be influenced by quasar orientation. In this investigation we examine the effect of orientation on the Mg ii line located at 2,798 Å in a sample of 36 radio-loud quasars, with orientation ...
Conor Wildy, Bozena Czerny
doaj   +1 more source

A Study of Quasar Radio Emission from the VLA FIRST Survey

, 1999
Using the most recent (1998) version of the VLA FIRST survey radio catalog, we have searched for radio emission from 1704 quasars taken from the most recent (1993) version of the Hewitt and Burbidge quasar catalog.
Ajit Kembhavi, Miller L., Terlevich R., Yogesh Wadadekar   +3 more
core   +2 more sources

A comparative HST imaging study of the host galaxies of radio-quiet quasars, radio-loud quasars and radio galaxies: Paper I [PDF]

, 1998
We present the first results from a major HST WFPC2 imaging study aimed at providing the first statistically meaningful comparison of the morphologies, luminosities, scalelengths and colours of the host galaxies of radio-quiet quasars, radio-loud quasars,
Akujor C. E., Antonucci R. R. J., Bahcall J. N., Bahcall J. N., Bahcall J. N., Bahcall J. N., Bahcall J. N., Barthel P. D., C. P. O'Dea, Capaccioli M., Carballo R., D. H. Hughes, De Koff S., Disney M. J., Dunlop J. S., Ellingson E., Fabian A. C., Feigelson E. D., Franceschini A., Giovannini G., Glazebrook K., Gower A. C., Gower A. C., Guiderdoni B., Haehnelt M. G., Heckman T. M., Heckman T. M., Hooper E. J., Hughes D. H., Hutchings J. B., Hutchings J. B., Hutchings J. B., Hutchings J. B., Hutchings J. B., Hutchings J. B., Hutchings J. B., J. S. Dunlop, Kormendy J., Kotilainen J. K., Kukula M. J., Leahy J. P., Lin H., Lister M. L., M. J. Kukula, MacKenty J. W., Magorrian J., McCarthy P. J., McLeod K. K., McLeod K. K., McLeod K. K., McLeod K. K., McLure R. J., Miley G. K., Miller P., R. J. McLure, Romney J., Ryden S., S. A. Baum, Sandage A. R., Schneider D. P., Silk J., Small T. A., Smith E. P., Smith E. P., Stockton A., Taylor G. T., Trauger J. T., Turnshek D. A., Urry C. M., van Breugel W., Veron-Cetty M. P., Veron-Cetty M. P., Young S.   +72 more
core   +2 more sources

High-Redshift, Radio-Loud Quasars

, 2000
I discuss two programs to study radio-loud quasars at high (z>4) redshift. Quasars are the most luminous, non-transient objects known and are observed to the earliest cosmic epochs. At lower redshifts, radio-loud quasars are associated with host galaxies having deVaucoleurs profiles. By association, identifying and studying a sample of high-redshift,
openaire   +2 more sources

Cosmological constraints from type-I radio-loud quasars

Physical Review D
arXiv admin note: text overlap with arXiv:2207 ...
L. Huang, Z. Y. Tu, N. Chang, F. F. Song, F. He, X. Y. Fu   +5 more
openaire   +2 more sources

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