Results 11 to 20 of about 6,418 (210)

THE NATURE OF TRANSITION BLAZARS [PDF]

The Astrophysical Journal, 2014
14 pages, 11 Figures, ApJ ...
J. J. Ruan, S. F. Anderson, R. M. Plotkin, W. N. Brandt, T. H. Burnett, A. D. Myers, D. P. Schneider   +6 more
core   +6 more sources

Near infrared polarimetry of a sample of blazars*

EPJ Web of Conferences, 2013
Polarization variability is one of the most ubiquitous characteristic of blazars. Near infrared (NIR)polarization measurements of blazars are not common, contrary to the optical ones.
Pulido J. A. Acosta, Pereyra A., Agudo I., Agulli I., Carnerero M., Segura N. Castro, Gómez J.L., Jorstad S., Marscher A.   +8 more
doaj   +2 more sources

General Physical Properties of Fermi Blazars

The Astrophysical Journal Supplement Series, 2023
We study the general physical properties of Fermi blazars using the Fermi fourth source catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars are fitted by using the one-zone leptonic model to obtain some physical ...
Yongyun Chen, Qiusheng Gu, Junhui Fan, Xiaoling Yu, Xiaogu Zhong, Hongyu Liu, Nan Ding, Dingrong Xiong, Xiaotong Guo   +8 more
doaj   +3 more sources

BlazEr1: The eROSITA blazar catalog

Astronomy & Astrophysics
Aims.eROSITA, on board the Spectrum Roentgen Gamma (SRG) spacecraft, performed its first X-ray all-sky survey (eRASS1) between December 2019 and June 2020.
Hämmerich S., Gokus A., McBride F., Weber P., Marcotulli L., Zainab A., Collmar W., Salvato M., Wolf J., Sbarrato T., Belladitta S., Buchner J., Saeedi S., Dauner L., Lorenz M., König O., Kirsch C., Berger K., Bahic S., Tubín-Arenas D., Krumpe M., Homan D., Markowitz A., Benke P., Rösch F., Rajasekar Kavitha P., Tambe H., Kadler M., Ros E., Ojha R., Wilms J.   +30 more
doaj   +3 more sources

Recognizing Blazars Using Radio Morphology from the VLA Sky Survey [PDF]

The Astrophysical Journal
Blazars are radio-loud active galactic nuclei whose jets have a very small angle to our line of sight. Observationally, the radio emissions are mostly compact or compact-core with a one-sided jet.
Zhang-Liang Xie, Eduardo Bañados, Silvia Belladitta, Chiara Mazzucchelli, Jan-Torge Schindler, Frederick Davies, Bram P. Venemans   +6 more
doaj   +3 more sources

X-ray Spectral Evolution of High Energy Peaked Blazars

Galaxies, 2020
The synchrotron hump of the high energy peaked blazars generally lies in the 0.1–10 keV range and such sources show extreme flux and spectral variability in X-ray bands. Various spectral studies showed that the X-ray spectra of high energy peaked blazars
Haritma Gaur
doaj   +2 more sources

Variability in blazars [PDF]

Astronomy and Astrophysics Supplement Series, 1998
The results of both BVRI CCD photometric monitoring and fast photometry for 8 blazars and variable quasars are presented. There is intraday variability for 6 blazars and very short timescales (minutes to two hours) variability for 5 objects. Implications for relativistic beaming are briefly discussed.
Guibin Jia, Cen Xuefen, Ma Huiyu, Jiancheng Wang   +3 more
openaire   +2 more sources

Long-Term Optical Monitoring of Blazars

Galaxies, 2019
Systematic monitoring of specific targets in the optical regime was historically applied on a very narrow sample of known variable stars. The discovery of blazars in the 20th century brought to the foreground the need for new global sky surveys, covering
Kosmas Gazeas
doaj   +2 more sources

High-energy neutrino emission from blazars [PDF]

, 2022
Active galactic nuclei (AGN) with relativistic jets are the most powerful persistent astrophysical sources of electromagnetic radiation in the Universe.
Foteini Oikonomou, Oikonomou, Foteini
core   +1 more source

Multifrequency observations of Blazars

, 1987
This paper reports the results of a programme of multifrequency observations of a sample of Blazars concentrating particularly on the millimetre through infrared region.
Gear, Walter Kieran, Robson, E. I., Brown, L. M. J.   +2 more
core   +5 more sources