Multi-Messengers of Black Hole Accretion and Emission

Dear Colleagues,

We are organizing a Special Issue concerning active black hole (BH) accretion and emission, with multi-messenger information. The supermassive BH (SMBH) in the center of galaxy M87 has been imaged with the Event Horizon Telescope (EHT); it is believed that there are SMBHs in other active galactic nuclei (AGNs). However, multi-wavelength (MW) electromagnetic emissions on diverse timescales, jets, quasi-periodic oscillations (QPOs) and neutrinos associated with AGNs are not well understood with respect to the mass accretion rate and other parameters such as the BH spin. Close binary BHs are interesting sources to search for gravitational waves (GWs) with ground-based facilities, while SMBH binaries are potential candidates for space-based GW experiments. Some properties of BH activity may be similar from stellar mass BHs to supermassive ones, for similar accretion mode, but their environment can be different. The stellar-mass BHs have been found in X-ray binaries in the Milky Way and nearby galaxies, and dozens of black hole X-ray binaries (BHXBs) have been confirmed with BHs of usually a few to tens of solar masses which are accreting from companion stars. It may be easier to investigate the BHXBs because of their much shorter timescales of flare/outbursts than those in AGNs. In this Special Issue, we expect to collect reviews as well as original research papers on studies of accretion and emission to compare BHs ranging from stellar-mass BHs to SMBHs, including intermediate-mass BHs (IMBHs).

Dr. Xiang Liu
Dr. Alok Gupta
Guest Editors

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