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Date and Time of the Query: 2019-08-18 T18:51:03 PDT
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For refcode 2014ApJ...794...34N:
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2014ApJ...794...34N Extended Structure and Fate of the Nucleus in Henize 2-10 Nguyen, Dieu D.; Seth, Anil C.; Reines, Amy E.; den Brok, Mark; Sand, David; McLeod, Brian Abstract. We investigate the structure and nuclear region of the black hole (BH) hosting galaxy Henize 2-10. Surface brightness profiles are analyzed using Magellan/Megacam g- and r-band images. Excluding the central starburst, we find a best-fit two-component Sersic profile with n_in_ ~ 0.6, r_eff, in_ ~ 260 pc and n_out_ ~ 1.8, r ~ 1 kpc. Integrating out to our outermost data point (100" ~ 4.3 kpc), we calculate M_g_ = -19.2 and M_r_ = -19.8. The corresponding enclosed stellar mass is M_sstarf_ ~ (10 +/- 3) x 10^9^ M_sun_, ~3 x larger than previous estimates. Apart from the central lsim500 pc, with blue colors and an irregular morphology, the galaxy appears to be an early-type system. The outer color is quite red, (g - r)_0_ = 0.75, suggesting a dominant old population. We study the nuclear region of the galaxy using archival Gemini/NIFS K-band adaptive optics spectroscopy and Hubble Space Telescope imaging. We place an upper limit on the BH mass of ~10^7^ M_sun_ from the NIFS data, consistent with that from the M_BH_-radio-X-ray fundamental plane. No coronal lines are seen, but a Brgamma source is located at the position of the BH with a luminosity consistent with the X-ray emission. The starburst at the center of Henize 2-10 has led to the formation of several super star clusters, which are within ~100 pc of the BH. We examine the fate of the nucleus by estimating the dynamical masses and dynamical friction timescales of the clusters. The most massive clusters (~10^6^ M_sun_) have tau_dyn_ <~ 200 Myr, and thus Henize 2-10 may represent a rare snapshot of nuclear star cluster formation around a preexisting massive BH. Key words: methods: data analysis, surveys, techniques: spectroscopic
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