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Investigation on Young radio AGNs based on SDSS spectroscopy
Mai Liao, Minfeng Gu
The Gigahertz Peaked Spectrum (GPS) sources, Compact Steep Spectrum (CSS) radio sources, and High Frequency Peakers (HFP) radio sources are thought to be young radio AGNs, at the e…
X-ray spectral variations of synchrotron peak in BL Lacs
Yijun Wang, Shifu Zhu, Yongquan Xue +3
The spectral energy distribution of blazars around the synchrotron peak can be well described by the log-parabolic model that has three parameters: peak energy (), pe…
Long-term optical spectroscopic variations in blazar 3C 454.3
Krzysztof Nalewajko, Alok C. Gupta, Mai Liao +3
Characterisation of the long-term variations in the broad line region in a luminous blazar, where Comptonisation of broad-line emission within a relativistic jet is the standard sc…
Properties of radio-loud quasars in Sloan Digital Sky Survey
Haritma Gaur, Minfeng Gu, S. Ramya +1
We present a study of a sample of 223 radio-loud quasars (up to redshift 0.3) in order to investigate their spectral properties. Twenty-six of these radio-loud quasars are ident…
X-ray Intra-day Variability of the TeV Blazar Mrk 421 with Suzaku
Zhongli Zhang, Alok C. Gupta, Haritma Gaur +5
We present X-ray flux and spectral analyses of the three pointed Suzaku observations of the TeV high synchrotron peak blazar Mrk 421 taken throughout its complete operational durat…
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope Collaboration
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comp…