activity
20172026
most citedHow far is quasar UV/optical variability from damped random walk at low frequency?

47 citations · 126 across the 22 of their papers we have counts for

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8 papers · 1 filter

astro-ph.HE2026

X-ray Fourier lag-frequency spectra modulated by stochastic turbulent acceleration in the jets of high-frequency-peaked BL Lac

Guang-Cheng Xiao, Wen Hu, Da-Guo Jiang +4

X-ray interband time lags are key diagnostics of jet physics and are frequently detected in high-frequency peaked BL Lac (HBL) objects at different epochs with various X-ray telesc…

astro-ph.HE2025

A UV to X-Ray View of Soft Excess in Type 1 Active Galactic Nuclei. II. Broadband Correlations

Shi-Jiang Chen, Jun-Xian Wang, Jia-Lai Kang +5

The physical origin of soft X-ray excess (SE) is a long lasting question, with two prevailing theories -- ``warm corona'' and ``ionized reflection'' -- dominating the discussion. I…

astro-ph.HE2024★ 6 cited

A UV to X-ray view of soft excess in type 1 AGNs: I. sample selection and spectral profile

Shi-Jiang Chen, Jun-Xian Wang, Jia-Lai Kang +5

A core sample of 59 unobscured type 1 AGNs with simultaneous XMM-Newton X-ray and UV observations is compiled from archive to probe the nature of soft X-ray excess (SE). In the fir…

astro-ph.HE2024

Nucleosynthesis contribution of neutrino-dominated accretion flows to the solar neighborhood

Yan-Qing Qi, Tong Liu, Mouyuan Sun +1

The elemental abundances of stars reflect the complex enrichment history of the galaxy. To explore and explain the metal enrichment history of the cosmic environment near our solar…

astro-ph.HE2024★ 1 cited

Unprecedented Continuum Time Delay Variation Phenomenon in an Active Supermassive Black Hole

Shuying Zhou, Mouyuan Sun, Hai-Cheng Feng +12

Resolving the accretion disks and broad line regions (BLRs) of active galactic nuclei (AGNs) can probe the physics behind supermassive black holes (SMBHs) fueling and weigh SMBHs.…

astro-ph.HE2024

Integrated Study of X-ray Spectrum and Time Lags for HBL Mrk 421 within the Framework of the Multiple-Zone Leptonic Model

Wen Hu, Jia-Lai Kang, Zhen-Yi Cai +3

We present the timing analysis of 10 archived \XMM observations with an exposure of ks of Markarian 421. Mrk 421 is the brightest high-frequency-peaked BL Lac object (HBL) em…

astro-ph.HE2024

Sizes of active galactic nuclei inhomogeneous disks -- large in microlensing, small in reverberation mapping

Guowei Ren, Mouyuan Sun, Jun-Xian Wang +1

Magnetohydrodynamics (MHD) turbulence can drive significant temperature fluctuations in the accretion disk of an active galactic nucleus (AGN). As a result, the disk can be highly…

astro-ph.HE2024

How long will the quasar UV/optical flickering be damped?

Shuying Zhou, Mouyuan Sun, Zhen-Yi Cai +3

The UV/optical light curves of Active Galactic Nuclei (AGNs) are commonly described by the Damped Random Walk (DRW) model. However, the physical interpretation of the damping times…