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, Dieu D.; Seth, Anil C.; Neumayer, Nadine; Iguchi, Satoru; Cappellari, Michelle; Strader, Jay; Chomiuk, Laura; Tremou, Evangelia; Pacucci, Fabio; Nakanishi, Kouichiro; Bahramian, Arash; Nguyen, Phuong M.; den Brok, Mark; Ahn, Christopher C.; Voggel, Karina T.; Kacharov, Nikolay; Tsukui, Takafumi; Ly, Cuc K.; Dumont, Antoine; Pechetti, Renuka

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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

MPS-Authors

Nguyen, Dieu D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Seth, Anil C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Neumayer, Nadine
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iguchi, Satoru
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cappellari, Michelle
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Strader, Jay
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chomiuk, Laura
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tremou, Evangelia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pacucci, Fabio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nakanishi, Kouichiro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bahramian, Arash
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nguyen, Phuong M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

den Brok, Mark
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ahn, Christopher C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Voggel, Karina T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kacharov, Nikolay
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tsukui, Takafumi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ly, Cuc K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dumont, Antoine
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pechetti, Renuka
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...872..104N
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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D044-3

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.