Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.


Cosmic lens reveals spinning black hole

The power of a cosmic lens to magnify and split the light from a distant, mass-accreting giant black hole into four components has allowed researchers to measure the black hole's spin. See Letter p.207

This is a preview of subscription content, access via your institution

Access options

Rent or buy this article

Get just this article for as long as you need it


Prices may be subject to local taxes which are calculated during checkout

Figure 1: A quadruple quasar.



  1. Reis, R. C., Reynolds, M. T., Miller, J. M. & Walton, D. J. Nature 507, 207–209 (2014).

    Article  ADS  CAS  Google Scholar 

  2. Volonteri, M., Madau, P., Quataert, E. & Rees, M. J. Astrophys. J. 620, 69–77 (2005).

    Article  ADS  CAS  Google Scholar 

  3. Fabian, A. C., Rees, M. J., Stella, L. & White, N. E. Mon. Not. R. Astron. Soc. 238, 729–736 (1989).

    Article  ADS  CAS  Google Scholar 

  4. Dauser, T., Wilms, J., Reynolds, C. S. & Brenneman, L. W. Mon. Not. R. Astron. Soc. 409, 1534–1540 (2010).

    Article  ADS  Google Scholar 

  5. Dovčiak, M., Karas, V. & Yaqoob, T. Astrophys. J. Suppl. 153, 205–221 (2004).

    Article  ADS  Google Scholar 

  6. Brenneman, L. W. & Reynolds, C. S. Astrophys. J. 652, 1028–1043 (2006).

    Article  ADS  CAS  Google Scholar 

  7. Walton, D. J. et al. Mon. Not. R. Astron. Soc. 428, 2901–2920 (2013).

    Article  ADS  Google Scholar 

  8. Risaliti, G. et al. Nature 452, 449–451 (2013).

    Article  ADS  Google Scholar 

  9. Miller, L., Turner, T. J. & Reeves, J. N. Astron. Astrophys. 483, 437–452 (2008).

    Article  ADS  CAS  Google Scholar 

  10. Claeskens, J.-F., Sluse, D., Riaud, P. & Surdej, J. Astron. Astrophys. 451, 865–879 (2006).

    Article  ADS  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to Guido Risaliti.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Risaliti, G. Cosmic lens reveals spinning black hole. Nature 507, 173–174 (2014).

Download citation

  • Published:

  • Issue Date:

  • DOI:


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing