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A black-hole mass measurement from molecular gas kinematics in NGC4526


The masses of the supermassive black holes found in galaxy bulges are correlated with a multitude of galaxy properties1,2, leading to suggestions that galaxies and black holes may evolve together3. The number of reliably measured black-hole masses is small, and the number of methods for measuring them is limited4, holding back attempts to understand this co-evolution. Directly measuring black-hole masses is currently possible with stellar kinematics (in early-type galaxies), ionized-gas kinematics (in some spiral and early-type galaxies5,6,7) and in rare objects that have central maser emission8. Here we report that by modelling the effect of a black hole on the kinematics of molecular gas it is possible to fit interferometric observations of CO emission and thereby accurately estimate black-hole masses. We study the dynamics of the gas in the early-type galaxy NGC 4526, and obtain a best fit that requires the presence of a central dark object of  × 108 solar masses (3σ confidence limit). With the next-generation millimetre-wavelength interferometers these observations could be reproduced in galaxies out to 75 megaparsecs in less than 5 hours of observing time. The use of molecular gas as a kinematic tracer should thus allow one to estimate black-hole masses in hundreds of galaxies in the local Universe, many more than are accessible with current techniques.

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Figure 1: NGC 4526 kinematic models and data.
Figure 2: NGC 4526 SMBH mass uncertainties.

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  1. Magorrian, J. et al. The demography of massive dark objects in galaxy centers. Astron. J. 115, 2285–2305 (1998)

    Article  ADS  Google Scholar 

  2. Graham, A., Erwin, P., Caon, N. & Trujillo, I. A correlation between galaxy light concentration and supermassive black hole mass. Astrophys. J. 563, L11–L14 (2001)

    Article  ADS  Google Scholar 

  3. Silk, J. & Rees, M. Quasars and galaxy formation. Astron. Astrophys. 331, L1–L4 (1998)

    ADS  Google Scholar 

  4. Ferrarese, L. & Ford, H. Supermassive black holes in galactic nuclei: past, present and future research. Space Sci. Rev. 116, 523–624 (2005)

    Article  ADS  Google Scholar 

  5. Sarzi, M. et al. Supermassive black holes in bulges. Astrophys. J. 550, 65–74 (2001)

    Article  ADS  Google Scholar 

  6. Barth, A. J. et al. Evidence for a supermassive black hole in the S0 galaxy NGC 3245. Astrophys. J. 555, 685–708 (2001)

    Article  CAS  ADS  Google Scholar 

  7. Ho, L. C. et al. An efficient strategy to select targets for gas dynamical measurements of black hole masses using the Hubble Space Telescope. Publ. Astron. Soc. Pacif. 114, 137–143 (2002)

    Article  ADS  Google Scholar 

  8. Lo, K. Y. Mega-masers and galaxies. Annu. Rev. Astron. Astrophys. 43, 625–676 (2005)

    Article  CAS  ADS  Google Scholar 

  9. Cappellari, M. et al. The SAURON project. IV. The mass-to-light ratio, the virial mass estimator and the fundamental plane of elliptical and lenticular galaxies. Mon. Not. R. Astron. Soc. 366, 1126–1150 (2006)

    Article  ADS  Google Scholar 

  10. Gultekin, K. et al. Determination of the intrinsic scatter in the Mσ and ML relations. Astrophys. J. 698, 198–221 (2009)

    Article  ADS  Google Scholar 

  11. Tonry, J. et al. The SBF survey of galaxy distances. IV. SBF magnitudes, colors, and distances. Astrophys. J. 546, 681–693 (2001)

    Article  ADS  Google Scholar 

  12. Combes, F., Young, L. M. & Bureau, M. Molecular gas and star formation in the SAURON early-type galaxies. Mon. Not. R. Astron. Soc. 377, 1795–1807 (2007)

    Article  ADS  Google Scholar 

  13. Young, L. M., Bureau, M. & Cappellari, M. Structure and kinematics of molecular disks in fast-rotator early-type galaxies. Astrophys. J. 676, 317–334 (2008)

    Article  CAS  ADS  Google Scholar 

  14. Davis, T. A. et al. The ATLAS3D project. X. On the origin of the molecular and ionized gas in early-type galaxies. Mon. Not. R. Astron. Soc. 417, 882–899 (2011)

    Article  CAS  ADS  Google Scholar 

  15. Bock, D. et al. CARMA: Combined Array for Research in Millimeter-Wave Astronomy. Proc. SPIE 6267, 13 (2006)

    Google Scholar 

  16. Alatalo, K. et al. The ATLAS3D project. XVIII. CARMA CO imaging survey of early-type galaxies. Preprint at (2012)

  17. Sault, R., Teuben, P. & Wright, M. A retrospective view of MIRIAD. Astron. Soc. Pacif. Conf. Ser. 77, 433–436 (1995)

    ADS  Google Scholar 

  18. Davis, T. A. et al. The ATLAS3D Project. XIV. The extent and kinematics of molecular gas in early-type galaxies. Preprint at (2012)

  19. Davis, T. A. et al. The ATLAS3D project. V. The CO Tully–Fisher relation of early-type galaxies. Mon. Not. R. Astron. Soc. 414, 968–984 (2011)

    Article  CAS  ADS  Google Scholar 

  20. Sofue, Y., Koda, J., Nakanishi, H. & Onodera, S. The Virgo high-resolution CO survey. II. Rotation curves and dynamical mass distributions. Publ. Astron. Soc. Jpn 55, 59–74 (2003)

    Article  CAS  ADS  Google Scholar 

  21. Kuntschner, H. et al. The SAURON project. XVII. Stellar population analysis of the absorption line strength maps of 48 early-type galaxies. Mon. Not. R. Astron. Soc. 408, 97–132 (2010)

    Article  CAS  ADS  Google Scholar 

  22. Crocker, A. F., Bureau, M., Young, L. M. & Combes, F. Molecular gas and star formation in early-type galaxies. Mon. Not. R. Astron. Soc. 410, 1197–1222 (2011)

    Article  CAS  ADS  Google Scholar 

  23. Neumayer, N. et al. The central parsecs of Centaurus A: high-excitation gas, a molecular disk, and the mass of the black hole. Astrophys. J. 671, 1329–1344 (2007)

    Article  CAS  ADS  Google Scholar 

  24. Ghez, A. et al. Measuring distance and properties of the Milky Way’s central supermassive black hole with stellar orbits. Astrophys. J. 689, 1044–1062 (2008)

    Article  CAS  ADS  Google Scholar 

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The research leading to these results has received funding from the European Community’s Seventh Framework Programme. M.B. is supported by the rolling grants ‘Astrophysics at Oxford’ and from the UK Research Councils. M.C. acknowledges support from a Royal Society University Research Fellowship. M.S. acknowledges support from a Science and Technology Facilities Council Advanced Fellowship. Support for the construction of CARMA was derived from the states of California, Illinois and Maryland, the James S. McDonnell Foundation, the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the University of Chicago, the Associates of the California Institute of Technology, and the National Science Foundation. Ongoing development and operations of CARMA are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities.

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T.A.D. prepared and reduced the observations, and created the modelling tool. T.A.D. and M.B. prepared the manuscript. M.C. created the mass model. All authors discussed the results and implications and commented on the manuscript at all stages.

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Correspondence to Timothy A. Davis.

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The authors declare no competing financial interests.

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Davis, T., Bureau, M., Cappellari, M. et al. A black-hole mass measurement from molecular gas kinematics in NGC4526. Nature 494, 328–330 (2013).

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