English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this review (the third in the series focused on a small two-bandUV-photometry mission), we assess possibilities for a small UV two-bandphotometry mission in studying accreting supermassive black holes (SMBHs; massrange $\sim 10^6$-$10^{10}\,M_{\odot}$). We focus on the followingobservational concepts: (i) dedicated monitoring of selected type-I ActiveGalactic Nuclei (AGN) in order to measure the time delay between the far-UV,the near-UV, and other wavebands (X-ray and optical), (ii) nuclear transientsincluding (partial) tidal disruption events and repetitive nuclear transients,and (iii) the study of peculiar sources, such as changing-look AGN, hollows andgaps in accretion disks, low-luminosity AGN, and candidates forIntermediate-Mass Black Holes (IMBHs; mass range $\sim 10^2$-$10^5\,M_{\odot}$)in galactic nuclei. For tidal disruption events (TDEs), high-cadence UVmonitoring is crucial for distinguishing among different scenarios for theorigin of the UV emission. The small two-band UV space telescope will alsoprovide the information about the near- and far-UV continuum variability forrare transients, such as repetitive partial TDEs and jetted TDEs. We alsodiscuss the possibilities to study and analyze sources with non-standardaccretion flows, such as AGN with gappy disks, low-luminosity active galacticnuclei with intermittent accretion, and SMBH binaries potentially involvingintermediate-mass black holes.

Science with a small two-band UV-photometry mission III: Active Galactic Nuclei and nuclear transients