The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei

Details The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4401s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #44.01; Bulletin of the American Astronomical Society, Vol. 39, p.792

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a study of galaxies that host both nuclear star clusters and active galactic nuclei (AGN) that imply the presence of a massive black hole. We select a sample of 176 galaxies with previously detected nuclear star clusters ranging from early-type ellipticals to late-type spiral galaxies. In this sample of galaxies we search for AGN using optical spectroscopy, and archival radio and X-ray data. We find galaxies that host both AGN and nuclear clusters across all Hubble types and over a wide range of masses (109-1011 solar masses). From the optical spectra, we find 10% of the galaxies are classified as AGN with an additional 15% classifed as transition objects. The fraction of galaxies with detected AGN in our sample as a function of galaxy luminosity and Hubble type is consistent with previous studies, suggesting that nuclear clusters do not play a strong role in promoting or limiting the growth of massive black holes. For galaxies containing both a NC and a black hole/AGN, we find that the masses of these two objects are quite similar. However, non-detections of black holes in local group nuclear clusters show that not all clusters host similar mass black holes.

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