We present a first systematic time series study of a sample of blazars observed by the
Transiting Exoplanet Survey Satellite (TESS). By cross matching the positions of the sources …

This paper presents the results of a detailed X-ray timing and spectral analysis of Mrk 501,
which are based mainly on the Swift data obtained during 2021 February–2022 December …

We present analyses of Suzaku XIS light curves and spectra of the BL Lac object OJ 287
with observations positioned primarily around proposed recurrent optical outbursts. The first …

A fraction of the active supermassive black holes at the centers of galaxies in our Universe
are capable of launching extreme kiloparsec-long relativistic jets. These jets are known …

Highly variable Markarian 421 is a bright high–synchrotron energy peaked blazar showing a
wide featureless nonthermal spectrum, making it a good candidate for our study of intraday …

Using nearly simultaneous radio, near-infrared, optical, and ultraviolet (UV) data collected
since 2009, we constructed 106 spectral energy distributions (SEDs) of the blazar OJ 287 …

Exploring the similar behavior of black hole systems with different scales will provide insight
into the unified physical laws of black hole systems. Here, we report a special spectral state …

Blazars exhibit relentless variability across diverse spatial and temporal frequencies. The
study of long-and short-term variability properties observed in the X-ray band provides …

Variability study at multi-frequency provides us with rich information of the emission and
variation mechanism for blazars. In this work, we present a comprehensive multi-frequency …

Blazars, a class of active galactic nuclei (AGN) powered by supermassive black holes, are
known for their remarkable variability across multiple timescales and wavelengths. With …