The mass of the black hole in RE J1034+396
Hryniewicz, K.; Życki, P. T.; Czerny, B.; You, B.; Kurcz, A.; Średzińska, J.; Nikołajuk, M.; Krupa, M.; Wang, J. -M.; Hu, C.
Poland, China
Abstract
Context. The black hole mass measurement in active galaxies is a challenge, particularly in sources where the reverberation method cannot be applied.
Aims: We aim to determine the black hole mass in a very special object, RE J1034+396, one of the two active galactic nuclei (AGN) with quasi-periodic oscillations detected in X-rays, and a single bright AGN with optical band totally dominated by starlight.
Methods: We fit the stellar content using the code starlight, and the broad band disk contribution to optical/UV/X-ray emission is modeled with OPTXAGNF. Based on starlight, we develop our own code OPTGAL for simultaneous fitting of the stellar, Fe II, and BC content in the optical/UV/X-ray data. We also determine the black hole mass using several other independent methods.
Results: Various methods give contradictory results. Most measurements of the black hole mass are in the range 106-107 M⊙, and the measurements based on dynamics give higher values than measurements based on Hβ and Mg II emission lines.