http://arxiv.org/abs/2304.03726
Since the late 20th century, young star-forming dwarf galaxies with extremely low heavy-element abundances have been identified in the local universe\cite{1972ApJ…173…25S, 1990Natur.343..238I, 2022ApJS..262….3N}. Such a population of galaxies, represented by SBS 0335-052E, is intensively studied as a laboratory of galaxy formation, and interpreted as galaxies with hard emission and energetic outflows driven by massive stars\cite{1990Natur.343..238I, 2004ApJ…606..213T, 2009AA…503…61I}. Here we report the temporal flux variability of SBS 0335-052E in $3-4 \ \mu$m bands on timescale of months to years with dimming and brightening up to 50\% over 12 years. This is a clear signature of dust torus emission of an active massive black hole in SBS 0335-052E. The deep optical spectrum reveals a very broad component with $1.24\ (\pm 0.01) \times 10^{4}$ km s$^{-1}$ in H$\alpha$ emission, suggesting emission originated from broad line regions around the massive black hole. The black hole mass is estimated to be $\sim 100$ thousand solar masses from the spectral energy distribution. This is the first example of the massive black hole existence in a long-considered young star-forming dwarf galaxy.
S. Hatano, M. Ouchi, K. Nakajima, et. al.
Mon, 10 Apr 23
11/36
Comments: 32 pages, 6 figures, 3 tables