Strong winds are common phenomena in active galactic nuclei. Although, there are abundant observational data about winds, the launching mechanisms of the winds are still not clear. Two possible drving mechanisms are radiation line force driven and magnetic driven. I will talk about our recent numerical simulation work on the roles of the two mechanisms on driving winds.
We study the small scale magnetic reconnection above the radiative inefficient accretion flow around massive black hole via 2D magnetohydrodynamics (MHD) numerical simulation, in order to model the blob formation and ejection from the accretion flow around Sgr A∗. The connection of both the newly emerging magnetic field and the pre-existing magnetic field is investigated to check whether blobs...
Jets/winds are ubiquitously in association with different celestial objects. However, most of previous theoretical studies of them rely on numerical calculations, not being able to provide a more convenient way for understanding rather abundant observational results. Now we have obtained a general analytical solution for describing a magnetically dominated jet/wind, through separating the...
Narrow line Seyfert 1 galaxies are found to host powerful relativistic jets. Consider their relatively low black hole mass and high accretion rate, they could play an important role to understand the formation and the evolution of AGN jet. In this talk, I introduce our recent works on NLS1s with the data of new low frequency radio surveys. We compared the jet-disk connections between NLS1s and...
Outflows (in the form of jet and/or wind) from weakly-accreting, low-luminosity AGNs are believed to play an important role in the host galaxy evolution. In this talk, I will present our recent work on parsec-scale jets and winds from the nearest known low-luminosity AGNs (including Sgr A, M31, M32 and M81), based primarily on X-ray and radio observations.
Curved broad-band spectral distributions of non-thermal sources like blazars are described well by a log-parabolic law where the spectra can be obtained for relativistic electrons by means of a statistical acceleration mechanism whose probability of acceleration depends on energy. In this work we used the curvature parameter of the synchrotron spectra (b) and the peak energy (Ep) to...
The Event Horizon Telescope has presented the prominent ring feature at the center of giant radio galaxy M87 which is consistent with the size and shape of the lensed photon orbit encircling the “shadow” of a supermassive black hole. I will review theoretical interpretation of EHT results and present recent progress of theoretical modeling beyond EHT.
I'll introduce my recent work on shear particle acceleration in large-scale jet, and its application to the observed FR I/II X-ray jets.
Supercritical accretion onto compact objects may drive massive winds
that are nearly spherical, optically thick, and Eddington-limited.
Blackbody emission from the photosphere is the direct observational
signature of the wind. Here I show that such a scenario can explain the
X-ray emission from the luminous and very soft sources in nearby
galaxies, and their broadband spectra via an...
Insight-HXMT is China’s first X-ray astronomy satellite and was successfully launched on June 15th, 2017. It made extensive and broad band (1-250 keV) observations of the black hole X-ray binary MAXI J1820+070 during its most recent bright outburst. Timing analysis has found low-frequency quasi-periodic oscillations (LFQPOs) up to above 200 keV, the highest energy from any accreting black hole...
The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high energy sky in the 300 GeV to 100 TeV energy range and it has detected two blazars, Markarian 421 (Mrk 421) and Markarian 501 (Mrk 501). The observations comprises the period between June 2015 and July 2018, resulting in a ~1038 days of effective exposure. In this talk I will show the time averaged spectral...
