Journal Article

The central black hole mass of the high-σ but low-bulge-luminosity lenticular galaxy NGC 1332*

S. P. Rusli, J. Thomas, P. Erwin, R. P. Saglia, N. Nowak and R. Bender

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 2, pages 1223-1236
Published in print January 2011 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17610.x
The central black hole mass of the high-σ but low-bulge-luminosity lenticular galaxy NGC 1332*

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The masses of the most massive supermassive black holes (SMBHs) predicted by the MBH–σ and MBHL relations appear to be in conflict. Which of the two relations is the more fundamental one remains an open question. NGC 1332 is an excellent example that represents the regime of conflict. It is a massive lenticular galaxy which has a bulge with a high velocity dispersion σ of ∼320 km s−1; bulge–disc decomposition suggests that only 44 per cent of the total light comes from the bulge. The MBH–σ and the MBHL predictions for the central black hole mass of NGC 1332 differ by almost an order of magnitude. We present a stellar dynamical measurement of the SMBH mass using an axisymmetric orbit superposition method. Our SINFONI integral-field unit (IFU) observations of NGC 1332 resolve the SMBH's sphere of influence which has a diameter of ∼0.76 arcsec. The σ inside 0.2 arcsec reaches ∼400 km s−1. The IFU data allow us to increase the statistical significance of our results by modelling each of the four quadrants separately. We measure an SMBH mass of (1.45 ± 0.20) × 109 M with a bulge mass-to-light ratio of 7.08 ± 0.39 in the R band. With this mass, the SMBH of NGC 1332 is offset from the MBHL relation by a full order of magnitude but is consistent with the MBH–σ relation.

Keywords: galaxies: individual: NGC 1332; galaxies: kinematics and dynamics

Journal Article.  12397 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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