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Rising Near-ultraviolet Spectra in Stellar Megaflares

Notsu, Yuta; Kowalski, Adam F.; Maehara, Hiroyuki +5 more

Flares from M dwarf stars can attain energies up to 10⁴ times larger than solar flares but are generally thought to result from similar processes of magnetic energy release and particle acceleration. Larger heating rates in the low atmosphere are needed to reproduce the shape and strength of the observed continua in stellar flares, whic…

Understanding the Broad-line Region of Active Galactic Nuclei with Photoionization. I. The Moderate-accretion Regime

Brandt, W. N.; Shen, Yue; Ho, Luis C. +9 more

Over three decades of reverberation mapping (RM) studies on local broad-line active galactic nuclei (AGNs) have measured reliable black hole (BH) masses for >100 AGNs. These RM measurements reveal a significant correlation between the Balmer broad-line region (BLR) size and AGN optical luminosity (the R–L relation). Recent RM studies for AGN sa…