Results 11 to 20 of about 38,287 (310)

Testing the Blazar Sequence with Spectra of Recently Discovered Dim Blazars from the Fermi Unassociated Catalog [PDF]

The Astrophysical Journal, 2023
Recent works have developed samples of blazars from among the Fermi Large Area Telescope unassociated sources via machine-learning comparisons with known blazar samples. Continued analysis of these new blazars tests the predictions of the blazar sequence
Stephen Kerby, Abraham D. Falcone
doaj   +2 more sources

Multi-wavelength Intra-day Variability and Quasi-periodic Oscillation in Blazars

Galaxies, 2017
We reviewed multi-wavelength blazars variability and detection of quasi-periodic oscillations on intra-day timescales. The variability timescale from few minutes to up to less than a days is commonly known as intra-day variability.
Gupta, Alok C.
core   +8 more sources

Blazars at the Cosmic Dawn [PDF]

The Astrophysical Journal, 2020
Abstract The uncharted territory of the high-redshift (z ≳ 3) universe holds the key to understanding the evolution of quasars. In an attempt to identify the most extreme members of the quasar population, that is, blazars, we have carried out a multiwavelength study of a large sample of radio-loud quasars beyond z = 3.
Vaidehi S. Paliya, M. Ajello, H.-M. Cao, M. Giroletti, Amanpreet Kaur, Greg Madejski, Benoit Lott, D. Hartmann   +7 more
openaire   +8 more sources

Optical spectroscopic observations of blazars and gamma-ray blazar candidates in the Sloan Digital Sky Survey Data Release Nine [PDF]

, 2014
We present an analysis of the optical spectra available in the Sloan Digital Sky survey data release nine (SDSS DR9) for the blazars listed in the ROMA-BZCAT and for the gamma-ray blazar candidates selected according to their IR colors. First, we adopt a
,, /INAF-IRA, Bologna, /SLAC /KIPAC, Menlo Park, /SLAC /KIPAC, Menlo Park, Astrophys., /Harvard-Smithsonian Ctr., D'Abrusco, R., Funk, S., Masetti, N., Massaro, F., Paggi, A.   +9 more
core   +3 more sources

From the ‘blazar sequence' to unification of blazars and radio galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
7 pages, 2 table, 5 figures, accepted for publication in ...
Dingrong Xiong, Jin-Ming Bai, Xiong Zhang, Haojing Zhang   +3 more
openaire   +4 more sources

Understanding Blazar Jets Through Their Multifrequency Emission [PDF]

, 1999
Being dominated by non-thermal (synchrotron and inverse Compton) emission from a relativistic jet, blazars offer important clues to the structure and radiative processes in extragalactic jets.
Sambruna, Rita M.
core   +5 more sources

Connection Between Optical and VHE Gamma-ray Emission in Blazar Jets [PDF]

, 2011
MAGIC has been performing optically triggered Target of Opportunity observations of flaring blazars since the beginning of its scientific operations.
Aimo Sillanpää, Andrei Berdyugin, Daniel Mazin, Elina J Lindfors, Kari Nilsson, Leo O Takalo, null null, Riho Reinthal   +7 more
core   +2 more sources

Deep Blazar Surveys [PDF]

arXiv, 2000
I address the need for deep blazar surveys by showing that our current understanding of blazars is based on a relatively small number of intrinsically luminous sources. I then review the on-going deeper surveys, addressing in particular their limits and limitations.
P. Padovani
arxiv   +3 more sources

The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux [PDF]

, 2016
The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question of which astrophysical sources generate this signal. One class of extragalactic sources which may produce such high-energy neutrinos are blazars.
Aartsen, M. G., Abraham, K., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Altmann, D., Andeen, K., Anderson, T., Ansseau, I., Anton, G., Archinger, M., Arguelles, C., Argüelles, C., Arlen, T. C., Auffenberg, J., Axani, S., Bai, X., Barwick, S. W., Baum, V., Bay, R., Beatty, J. J., Becker, K. -H., BenZvi, S., Berghaus, P., Berley, D., Bernardini, E., Bernhard, A., Besson, D. Z., Binder, G., Bindig, D., Bissok, M., Blaufuss, E., Blot, S., Boersma, D. J., Bohm, C., Bos, F., Bose, D., Botner, O., Braun, J., Brayeur, L., Bretz, Hans-Peter, Burgman, A., Börner, M., Böser, S., Casey, J., Casier, M., Cheung, E., Chirkin, D., Christov, A., Clark, K., Classen, L., Coenders, S., Collin, G. H., Conrad, J. M., Cowen, D. F., Daughhetee, J., Davis, J. C., Day, M., de André, J. P. A. M., De Clercq, C., De Ridder, S., de Vries, K. D., de Wasseige, G., de With, M., Dembinski, H., Desiati, P., DeYoung, T., di Lorenzo, V., Dujmovic, H., Dumm, J. P., Dunkman, M., Díaz-Vélez, J. C., Eberhardt, B., Ehrhardt, T., Eichmann, B., Euler, S., Evenson, P. A., Fahey, S., Fazely, A. R., Feintzeig, J., Felde, J., Filimonov, K., Finley, C., Flis, S., Franckowiak, A., Fuchs, T., Fösig, C. -C., Gaior, R., Gaisser, T. K., Gallagher, J., Gerhardt, L., Ghorbani, K., Giang, W., Gladstone, L., Glagla, M., Glüsenkamp, T., Goldschmidt, A., Golup, G., Gonzalez, J. G., Grant, D., Griffith, Z., Góra, D., Haack, C., Hallgren, A., Halzen, F., Hansen, E., Hansmann, B., Hansmann, T., Hanson, K., Hebecker, D., Heereman, D., Helbing, K., Hellauer, R., Heros, C. Pérez de los, Herrera, S. E. Sanchez, Hickford, S., Hignight, J., Hill, G. C., Hoffman, K. D., Hoffmann, R., Holzapfel, K., Homeier, A., Hoshina, K., Huang, F., Huber, M., Huelsnitz, W., Hultqvist, K., IceCube Collaboration, IceCube Collaboration, In, S., Ishihara, A., Ismail, A. Haj, Jacobi, E., Japaridze, G. S., Jeong, M., Jero, K., Jones, B. J. P., Jurkovic, M., Kappes, A., Karg, T., Karle, A., Katz, U., Kauer, M., Keivani, A., Kelley, J. L., Kemp, J., Kheirandish, A., Kim, M., Kintscher, T., Kiryluk, J., Kittler, T., Klein, S. R., Kohnen, G., Koirala, R., Kolanoski, H., Konietz, R., Kopper, C., Kopper, S., Koskinen, D. J., Kowalski, M., Krings, K., Kroll, M., Krückl, G., Krüger, C., Kunnen, J., Kunwar, S., Kurahashi, N., Kuwabara, T., Köpke, L., Labare, M., Lanfranchi, J. L., Larson, M. J., Lennarz, D., Lesiak-Bzdak, M., Leuermann, M., Leuner, J., Lu, L., Lünemann, J., Madsen, J., Maggi, G., Mahn, K. B. M., Mancina, S., Mandelartz, M., Maruyama, R., Mase, K., Maunu, R., McNally, F., Meagher, K., Medici, M., Meier, M., Meli, A., Menne, T., Merino, G., Meures, T., Miarecki, S., Middell, E., Mohrmann, L., Montaruli, T., Moulai, M., Nahnhauer, R., Naumann, U., Neer, G., Niederhausen, H., Nowicki, S. C., Nygren, D. R., O'Murchadha, A., Olivas, A., Omairat, A., Palczewski, T., Pandya, H., Pankova, D. V., Penek, Ö., Pepper, J. A., Pfendner, C., Pieloth, D., Pinat, E., Pollmann, A. Obertacke, Posselt, J., Price, P. B., Przybylski, G. T., Quinnan, M., Raab, C., Rameez, M., Rawlins, K., Reimann, R., Relich, M., Resconi, E., Rhode, W., Richman, M., Riedel, B., Robertson, S., Rongen, M., Rosendo, E. del Pino, Rott, C., Ruhe, T., Ryckbosch, D., Rysewyk, D., Rädel, L., Sabbatini, L., Sandrock, A., Sandroos, J., Sarkar, S., Satalecka, K., Schimp, M., Schlunder, P., Schmidt, T., Schoenen, S., Schumacher, L., Schöneberg, S., Schönwald, A., Seckel, D., Seunarine, S., Silva, A. H. Cruz, Soldin, D., Song, M., Spiczak, G. M., Spiering, C., Stahlberg, M., Stamatikos, M., Stanev, T., Stasik, A., Steuer, A., Stezelberger, T., Stokstad, R. G., Strotjohann, N. L., Ström, R., Stößl, A., Sullivan, G. W., Sutherland, M., Taavola, H., Taboada, I., Tatar, J., Ter-Antonyan, S., Terliuk, A., Tešić, G., Tilav, S., Tjus, J. Becker, Toale, P. A., Tobin, M. N., Toscano, S., Tosi, D., Tselengidou, M., Turcati, A., Unger, E., Usner, M., Vallecorsa, S., van Eijndhoven, N., van Rossem, M., van Santen, J., Vandenbroucke, J., Vanheule, S., Veenkamp, J., Vehring, M., Voge, M., Vraeghe, M., Walck, C., Wallace, A., Wallraff, M., Wandkowsky, N., Weaver, Ch., Wendt, C., Westerhoff, S., Whelan, B. J., Wickmann, S., Wiebe, K., Wiebusch, C. H., Wille, L., Williams, D. R., Wills, L., Wissing, H., Wolf, M., Wood, T. R., Woolsey, E., Woschnagg, K., Xu, D. L., Xu, X. W., Xu, Y., Yanez, J. P., Yodh, G., Yoshida, S., Zoll, M.   +322 more
core   +5 more sources

Relativistic Jets of Blazars [PDF]

New Astronomy Reviews, 2019
To appear in New Astronomy Reviews special volume '100 Years of Astrophysical Jets' (eds. Rob Fender and Ralph Wijers).
Elina Lindfors, Talvikki Hovatta, Talvikki Hovatta   +2 more
openaire   +8 more sources