A 10,000-solar-mass black hole in the nucleus of a bulgeless dwarf galaxy

Abstract

The motions of gas and stars in the nuclei of nearby galaxies have demonstrated that massive black holes are common1 and that their masses correlate with the stellar velocity dispersion σ of the bulge2,3,4. This correlation suggests that massive black holes and galaxies influence each other’s growth5,6,7. Dynamical measurements are less reliable when the sphere of influence is unresolved; thus, it remains unknown whether this correlation exists in galaxies much smaller than the Milky Way. Light echoes from photoionized clouds around accreting black holes8,9, in combination with the velocity of these clouds, yield a direct mass measurement that circumvents this difficulty. Here we report an exceptionally low reverberation delay of 83 ± 14 min between variability in the accretion disk and Hα emission from the nucleus of the dwarf galaxy NGC 4395. Combined with the Hα velocity dispersion σline = 426 ± 1 km s−1, this lag determines a mass of about 10,000 M for the black hole (MBH). This mass is among the smallest central black hole masses reported, near the low end of expected masses for heavy ‘seeds’10,11,12, and the best direct mass measurement for a galaxy of this size. Despite the lack of a bulge, NGC 4395 is consistent with the MBHσ relation, indicating that the relation need not originate from hierarchical galaxy assembly nor from black hole feedback.

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Fig. 1: Cross-correlation analysis of photometric light curves.
Fig. 2: Continuum-corrected Hα light curve.
Fig. 3: Hα velocity measurement based on spectral decomposition.
Fig. 4: MBHσ relation.

Data availability

The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.

References

  1. 1.

    Kormendy, J. & Ho, L. C. Coevolution (or not) of supermassive black holes and host galaxies. Annu. Rev. Astron. Astrophys. 51, 511–653 (2013).

    ADS  Article  Google Scholar 

  2. 2.

    Ferrarese, L. & Merritt, D. A fundamental relation between supermassive black holes and their host galaxies. Astrophys. J. 539, L9–L12 (2000).

    ADS  Article  Google Scholar 

  3. 3.

    Gebhardt, K. et al. A relationship between nuclear black hole mass and galaxy velocity dispersion. Astrophys. J. 539, L13–L16 (2000).

    ADS  Article  Google Scholar 

  4. 4.

    Onken, C. A. et al. Supermassive black holes in active galactic nuclei. II. Calibration of the black hole mass–velocity dispersion relationship for active galactic nuclei. Astrophys. J. 615, 645–651 (2004).

    ADS  Article  Google Scholar 

  5. 5.

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

    ADS  Google Scholar 

  6. 6.

    King, A. Black holes, galaxy formation, and the M BHσ relation. Astrophys. J. 596, L27–L29 (2003).

    ADS  Article  Google Scholar 

  7. 7.

    Fabian, A. C. Observational evidence of active galactic nuclei feedback. Annu. Rev. Astron. Astrophys. 50, 455–489 (2012).

    ADS  Article  Google Scholar 

  8. 8.

    Blandford, R. D. & McKee, C. F. Reverberation mapping of the emission line regions of Seyfert galaxies and quasars. Astrophys. J. 255, 419–439 (1982).

    ADS  Article  Google Scholar 

  9. 9.

    Peterson, B. M. Reverberation mapping of active galactic nuclei. Publ. Astron. Soc. Pac. 105, 247 (1993).

    ADS  Article  Google Scholar 

  10. 10.

    Begelman, M. C., Volonteri, M. & Rees, M. J. Formation of supermassive blackholes by direct collapse in pre-galactic haloes. Mon. Not. R. Astron. Soc. 370, 289–298 (2006).

    ADS  Article  Google Scholar 

  11. 11.

    Dijkstra, M., Haiman, Z., Mesinger, A. & Wyithe, J. S. B. Fluctuations in the high-redshift Lyman–Werner background: close halo pairs as the origin of supermassive black holes. Mon. Not. R. Astron. Soc. 391, 1961–1972 (2008).

    ADS  Article  Google Scholar 

  12. 12.

    Agarwal, B. et al. Ubiquitous seeding of supermassive black holes by direct collapse. Mon. Not. R. Astron. Soc. 425, 2854–2871 (2012).

    ADS  Article  Google Scholar 

  13. 13.

    Filippenko, A. V. & Sargent, W. L. W. Discovery of an extremely low luminosity Seyfert 1 nucleus in the dwarf galaxy NGC 4395. Astrophys. J. 342, L11 (1989).

    ADS  Article  Google Scholar 

  14. 14.

    Filippenko, A. V. & Ho, L. C. A low-mass central black hole in the bulgeless Seyfert 1 galaxy NGC 4395. Astrophys. J. 588, L13–L16 (2003).

    ADS  Article  Google Scholar 

  15. 15.

    Edri, H., Rafter, S. E., Chelouche, D., Kaspi, S. & Behar, E. Broadband photometric reverberation mapping of NGC 4395. Astrophys. J. 756, 73 (2012).

    ADS  Article  Google Scholar 

  16. 16.

    La Franca, F. et al. Extending virial black hole mass estimates to low-luminosity or obscured AGN: the cases of NGC4395 and MCG-01-24-012. Mon. Not. R. Astron. Soc. 449, 1526–1535 (2015).

    ADS  Article  Google Scholar 

  17. 17.

    den Brok, M. et al. Measuring the mass of the central black hole in the bulgeless galaxy NGC 4395 from gas dynamical modeling. Astrophys. J. 809, 101 (2015).

    ADS  Article  Google Scholar 

  18. 18.

    Peterson, B. M. et al. Multiwavelength monitoring of the dwarf Seyfert 1 galaxy NGC 4395. I. A reverberation-based measurement of the black hole mass. Astrophys. J. 632, 799–808 (2005).

    ADS  Article  Google Scholar 

  19. 19.

    Desroches, L.-B. et al. Multiwavelength monitoring of the dwarf Seyfert 1 galaxy NGC 4395. III. Optical variability and X-ray/UV/optical correlations. Astrophys. J. 650, 88–101 (2006).

    ADS  Article  Google Scholar 

  20. 20.

    Woo, J.-H., Yoon, Y., Park, S., Park, D. & Kim, S. C. The black hole mass–stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies. Astrophys. J. 801, 38 (2015).

    ADS  Article  Google Scholar 

  21. 21.

    Pancoast, A. K. A New Method for Measuring Black Hole Masses in Active Galaxies: Modeling the Broad Line Region Using Reverberation Mapping Data. PhD thesis, Univ. California, Santa Barbara (2015).

  22. 22.

    De Rosa, G. et al. Space telescope and optical reverberation mapping project. I. Ultraviolet observations of the Seyfert 1 galaxy NGC 5548 with the cosmic origins spectrograph on Hubble Space Telescope. Astrophys. J. 806, 128 (2015).

    ADS  Article  Google Scholar 

  23. 23.

    Jahnke, K. & Macciò, A. V. The non-causal origin of the black-hole-galaxy scaling relations. Astrophys. J. 734, 92 (2011).

    ADS  Article  Google Scholar 

  24. 24.

    Granato, G. L., De Zotti, G., Silva, L., Bressan, A. & Danese, L. A physical model for the coevolution of QSOs and their spheroidal hosts. Astrophys. J. 600, 580–594 (2004).

    ADS  Article  Google Scholar 

  25. 25.

    Croton, D. J. et al. The many lives of active galactic nuclei: cooling flows, black holes and the luminosities and colours of galaxies. Mon. Not. R. Astron. Soc. 365, 11–28 (2006).

    ADS  Article  Google Scholar 

  26. 26.

    Dubois, Y. et al. Black hole evolution—I. Supernova-regulated black hole growth. Mon. Not. R. Astron. Soc. 452, 1502–1518 (2015).

    ADS  Article  Google Scholar 

  27. 27.

    Anglés-Alcázar, D. et al. Black holes on FIRE: stellar feedback limits early feeding of galactic nuclei. Mon. Not. R. Astron. Soc. 472, L109–L114 (2017).

    ADS  Article  Google Scholar 

  28. 28.

    Greene, J. E. Low-mass black holes as the remnants of primordial black hole formation. Nat. Commun. 3, 1304 (2012).

    ADS  Article  Google Scholar 

  29. 29.

    White, R. J. & Peterson, B. M. Comments on cross-correlation methodology in variability studies of active galactic nuclei. Publ. Astron. Soc. Pac. 106, 879 (1994).

    ADS  Article  Google Scholar 

  30. 30.

    Peterson, B. M. et al. On uncertainties in cross-correlation lags and the reality of wavelength-dependent continuum lags in active galactic nuclei. Publ. Astron. Soc. Pac. 110, 660–670 (1998).

    ADS  Article  Google Scholar 

  31. 31.

    Kraemer, S. B., Ho, L. C., Crenshaw, D. M., Shields, J. C. & Filippenko, A. V. Physical conditions in the emission-line gas in the extremely low luminosity Seyfert nucleus of NGC 4395. Astrophys. J. 520, 564–573 (1999).

    ADS  Article  Google Scholar 

  32. 32.

    Denney, K. D. Are outflows biasing single-epoch C iv black hole mass estimates? Astrophys. J. 759, 44 (2012).

    ADS  Article  Google Scholar 

  33. 33.

    Komossa, S., Xu, D., Zhou, H., Storchi-Bergmann, T. & Binette, L. On the nature of Seyfert galaxies with high [O iii] λ5007 blueshifts. Astrophys. J. 680, 926–938 (2008).

    ADS  Article  Google Scholar 

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Acknowledgements

This work has been supported by the Basic Science Research Program through the National Research Foundation of Korea government (2016R1A2B3011457), and by Samsung Science and Technology Foundation under Project Number SSTF-BA1501-05. This work was supported by K-GMT Science Program (PID: GN-2017A-Q-2) of Korea Astronomy and Space Science Institute. We thank the various contributions from the NGC 4395 Collaboration.

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J.-H.W. wrote the manuscript with comments from all authors and performed much of the analysis. J.-H.W. also carried out the Gemini observations and coordinated all observations. H.C. analysed the photometric light curves and Gemini spectra to measure the lag and velocity dispersion. E.G. substantially revised the manuscript and contributed to the analysis. E.H.-K. carried out MDM observations and revised the manuscript. H.A.N.L., J.S. and D.S. carried out MDM observations. J.C.H. carried out MLO observations.

Corresponding author

Correspondence to Jong-Hak Woo.

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The authors declare no competing interests.

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Peer review information: Nature Astronomy thanks Michael Fausnaugh and Jonathan Trump for their contribution to the peer review of this work.

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Supplementary Figs. 1 and 2.

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Woo, J., Cho, H., Gallo, E. et al. A 10,000-solar-mass black hole in the nucleus of a bulgeless dwarf galaxy. Nat Astron 3, 755–759 (2019). https://doi.org/10.1038/s41550-019-0790-3

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