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Testing the robustness of black hole mass measurements with ALMA and MUSE

Published online by Cambridge University Press:  14 May 2020

Sabine Thater Open the ORCID record for Sabine Thater [Opens in a new window] ,
Davor Krajnović ,
Dieu D. Nguyen Open the ORCID record for Dieu D. Nguyen [Opens in a new window] ,
Satoru Iguchi  and
Peter M. Weilbacher
Sabine Thater
Affiliation:
Leibniz-Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany email: sthater@aip.de
Davor Krajnović
Affiliation:
Leibniz-Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany email: sthater@aip.de
Dieu D. Nguyen
Affiliation:
National Astronomical Observatory of Japan, 2 Chome-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Satoru Iguchi
Affiliation:
National Astronomical Observatory of Japan, 2 Chome-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Peter M. Weilbacher
Affiliation:
Leibniz-Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany email: sthater@aip.de
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Abstract

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We present our ongoing work of using two independent tracers to estimate the supermassive black hole mass in the nearby early-type galaxy NGC 6958; namely integrated stellar and molecular gas kinematics. We used data from the Atacama Large Millimeter/submillimeter Array (ALMA), and the adaptive-optics assisted Multi-Unit Spectroscopic Explorer (MUSE) and constructed state-of-the-art dynamical models. The different methods provide black hole masses of (2.89±2.05)×108M⊙ from stellar kinematics and (1.35±0.09)×108M⊙ from molecular gas kinematics which are consistent within their 3σ uncertainties. Compared to recent MBH - σe scaling relations, we derive a slightly over-massive black hole. Our results also confirm previous findings that gas-based methods tend to provide lower black hole masses than stellar-based methods. More black hole mass measurements and an extensive analysis of the method-dependent systematics are needed in the future to understand this noticeable discrepancy.

Keywords

galaxies: kinematics and dynamicsgalaxies: nucleigalaxies: individual (NGC6958)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 199 - 202
Copyright
© International Astronomical Union 2020

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