Zobrazeno 1 - 10
of 7 357
pro vyhledávání: '"bl-lac objects"'
Autor:
Nilsson, K., Ramazani, V. Fallah, Lindfors, E., Goldoni, P., González, J. Becerra, Pulido, J. A. Acosta, Clavero, R., Otero-Santos, J., Pursimo, T., Pita, S., Kouch, P. M., Boisson, C., Backes, M., Cotter, G., D'Ammando, F., Kasai, E.
Publikováno v:
A&A 691, A154 (2024)
Direct redshift determination of BL Lac objects is highly challenging as the emission in the optical and near-infrared (NIR) bands is largely dominated by the non-thermal emission from the relativistic jet that points very close to our line of sight.
Externí odkaz:
http://arxiv.org/abs/2408.14854
Previous studies on the fitting of spectral energy distributions (SEDs) often apply the external-Compton process to interpret the high-energy peak of low-synchrotron-peaked (LSP) BL Lac objects (LBLs), despite the lack of strong broad emission lines
Externí odkaz:
http://arxiv.org/abs/2402.10390
Absorption and emission lines in the optical spectrum are typically used to investigate the presence of large-scale environments in active galactic nuclei (AGNs). BL Lac objects - which are a category of AGNs with the relativistic jet pointing direct
Externí odkaz:
http://arxiv.org/abs/2308.05492
The production site of gamma rays in blazars is closely related to their interaction with the photon fields surrounding the active galactic nucleus. In this work we discuss an indirect method that may help to unveil the presence of ambient structures
Externí odkaz:
http://arxiv.org/abs/2302.10762
Polarized radiation from blazars is one key piece of evidence for synchrotron radiation at low energy, which also shows variations. We present here our results on the correlation analysis between optical flux and polarization degree (PD) variations i
Externí odkaz:
http://arxiv.org/abs/2209.02444
Publikováno v:
PROGRESS IN ASTRONOM, 2021, Vol. 39, Article 1
The extragalactic $\gamma$-ray sky is dominated by blazars and their study plays an important role in understanding jet physics, cosmic evolution history and origin of ultra high energy cosmic rays. In this work, we study a large sample of BL Lac obj
Externí odkaz:
http://arxiv.org/abs/2205.10172
Publikováno v:
ApJ 926 95 (2022)
The production site of gamma rays in blazars is closely related to their interaction with the photon fields surrounding the active galactic nucleus. In this paper, we discuss an indirect method that may help to unveil the presence of ambient structur
Externí odkaz:
http://arxiv.org/abs/2201.02454
Autor:
Ye, Xu-Hong, Fan, Jun-Hui
Publikováno v:
PASJ. 75 (2021) 775-785
In this work, we collected a sample of BL Lacs, FR I and FR II(G) radio galaxies with available core and extended emissions from published works to discuss the unified schemes and estimate the Doppler factor for BL Lacs. Wilcoxon rank-sum test and Ko
Externí odkaz:
http://arxiv.org/abs/2111.09023
With the assumption that the optical variability timescale is dominated by the cooling time of the synchrotron process for BL Lac objects, we estimate time dependent magnetic field strength of the emission region for two BL Lac objects. The average m
Externí odkaz:
http://arxiv.org/abs/2109.11229
Autor:
Li, Wei-Jian, Xue, Rui, Long, Guang-Bo, Wang, Ze-Rui, Nagataki, Shigehiro, Yan, Da-Hai, Wang, Jian-Cheng
Publikováno v:
A&A 659, A184 (2022)
Context. The intrinsic TeV emission of some BL Lacs are characterized by a hard spectrum (the hard-TeV spectrum) after correcting for the extragalactic background light. The hard-TeV spectra pose a challenge to conventional one-zone models, including
Externí odkaz:
http://arxiv.org/abs/2201.12708