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  Measuring Masses and Densities of Nuclear Star Clusters in the Nearest Galaxies

Pechetti, R., Seth, A., Neumayer, N., Georgiev, I., & Kacharov, N. (2019). Measuring Masses and Densities of Nuclear Star Clusters in the Nearest Galaxies. In American Astronomical Society Meeting Abstracts #233.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D01E-F Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D01F-E
Genre: Conference Paper

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https://ui.adsabs.harvard.edu/abs/2019AAS...23324908P (Any fulltext)
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 Creators:
Pechetti, Renuka1, Author
Seth, Anil1, Author
Neumayer, Nadine1, Author
Georgiev, Iskren1, Author
Kacharov, Nikolay1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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 Abstract: Galaxy nuclei contain both black holes (BHs) and nuclear star clusters (NSCs). Low-mass galaxies are typically dominated by NSCs. Measurements of NSC mass density suggest a scaling relation exists between them and their host galaxy mass, but very few NSC masses are dynamically estimated. We will present density profiles and dynamical masses for 29 nearby galaxies within 10 Mpc based on HST imaging and accompanying infrared spectroscopy from GNIRS and XSHOOTER. We quantify the NSC profiles by determining the effective radius and Sersic index. These profiles are then combined with their central velocity dispersions, derived using CO bandheads, to get dynamical mass density estimates for the NSCs and upper limits on any BHs. These measurements increase the number of dynamical measurements of NSCs by a factor of 3. The resulting scaling relations can be used to disentangle the formation scenarios of the NSCs. In addition, the measurement of central densities will help determine the expected rate of tidal disruption events by central BHs in galactic nuclei.

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 Dates: 2019
 Publication Status: Issued
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Title: American Astronomical Society Meeting Abstracts #233
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Start-/End Date: 2019

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Title: American Astronomical Society Meeting Abstracts #233
Source Genre: Proceedings
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