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  Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei and the First Black Hole Determination for NGC 205

Nguyen, D. D., Seth, A. C., Neumayer, N., Iguchi, S., Cappellari, M., Strader, J., et al. (2019). Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei and the First Black Hole Determination for NGC 205. The Astrophysical Journal, 872.

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Nguyen, Dieu D.1, Author
Seth, Anil C.1, Author
Neumayer, Nadine1, Author
Iguchi, Satoru1, Author
Cappellari, Michelle1, Author
Strader, Jay1, Author
Chomiuk, Laura1, Author
Tremou, Evangelia1, Author
Pacucci, Fabio1, Author
Nakanishi, Kouichiro1, Author
Bahramian, Arash1, Author
Nguyen, Phuong M.1, Author
den Brok, Mark1, Author
Ahn, Christopher C.1, Author
Voggel, Karina T.1, Author
Kacharov, Nikolay1, Author
Tsukui, Takafumi1, Author
Ly, Cuc K.1, Author
Dumont, Antoine1, Author
Pechetti, Renuka1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: individual: NGC 205 NGC 5102 and NGC 5206 galaxies: kinematics and dynamics galaxies: nuclei quasars: supermassive black holes Astrophysics - Astrophysics of Galaxies
 Abstract: We improve the dynamical black hole (BH) mass estimates in three nearby low-mass early-type galaxies: NGC 205, NGC 5102, and NGC 5206. We use new Hubble Space Telescope (HST)/STIS spectroscopy to fit the star formation histories of the nuclei in these galaxies, and use these measurements to create local color-mass-to-light ratio (M/L) relations. We then create new mass models from HST imaging and combined with adaptive optics kinematics, we use Jeans dynamical models to constrain their BH masses. The masses of the central BHs in NGC 5102 and NGC 5206 are both below one million solar masses and are consistent with our previous estimates, {9.12}-1.53+1.84× {10}5 M and {6.31}-2.74+1.06× {10}5 M (3σ errors), respectively. However, for NGC 205, the improved models suggest the presence of a BH for the first time, with a best-fit mass of {6.8}-6.7+95.6× {10}3 M (3σ errors). This is the least massive central BH mass in a galaxy detected using any method. We discuss the possible systematic errors of this measurement in detail. Using this BH mass, the existing upper limits of both X-ray, and radio emissions in the nucleus of NGC 205 suggest an accretion rate ≲10-5 of the Eddington rate. We also discuss the color-M/L eff relations in our nuclei and find that the slopes of these vary significantly between nuclei. Nuclei with significant young stellar populations have steeper color-M/L eff relations than some previously published galaxy color-M/L eff relations.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 872 Sequence Number: - Start / End Page: - Identifier: -