منابع مشابه
Accretion Disks , Jets and Blazar Variability
Although blazar variability is probably dominated by emission from relativistic jets, accretion disks should be present in all blazars. These disks produce emission over most of the electromagnetic spectrum; various unstable processes operate in those disks which will lead to variable emission. Here I summarize some of the most relevant disk mechanisms for AGN variability. I also discuss some a...
متن کاملRadio variability of the gamma - ray blazar 0202 + 149
Analysis of radio light curves of the γ-ray bright blazar 0202+149 at frequencies of 37, 22, 14.5, 8, and 4.8 GHz during the period 1984-1998 reveals a 4-year cycle of variability with substructure on a shorter time scale of about 1.3-yr. The 4.8-37 GHz spectral index of the source gradually increases from −0.04 (T=1990.2) to 0.4 (T=1996.6) and during outbursts shows strong variations with a ti...
متن کاملVariability in the synchrotron self-Compton model of blazar emission
We present a model of the spectra of gamma-ray emitting blazars in which a single homogeneous emission region both emits synchrotron photons directly and scatters them to high (gamma-ray) energy before emission (a ‘synchrotron self-Compton’ or SSC model). In contrast to previous work, we follow the full time dependent evolution of the electron and photon spectra, assuming a power-law form of th...
متن کاملدادهکاهی و آنالیز تصاویر چند باندی نوری بلازار 180 Mrk
Nearly simultaneous multiband monitoring of blazars is very limited and most studies reported in literature are conflicting, too. Although optical variability on intra-night timescales is now a well established phenomenon for blazars, its relationship to long-term variability remains unclear. Possible clues could come from monitoring the optical spectrum for correlation with brightness. The pr...
متن کاملOn the Viewing Angle Dependence of Blazar Variability
Internal shocks propagating through an ambient radiation field, are subject to a radiative drag that, under certain conditions, can significantly affect their dynamics and, consequently, the evolution of the beaming cone of emission produced behind the shocks. The resultant change of the Doppler factor combined with opacity effects leads to a strong dependence of the variability pattern produce...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy Reports
سال: 2007
ISSN: 1063-7729,1562-6881
DOI: 10.1134/s1063772907110029