Jeff McClintock’s Home Page

Harvard Smithsonian Center for Astrophysics (CfA)

Jeff McClintock

  Jeffrey E. McClintock

Senior Astrophysicist
Smithsonian Astrophysical Observatory (SAO)
High Energy Astrophysics Division

Harvard University Department of Astronomy

  Contact Information
Harvard-Smithsonian Center for Astrophysics
60 Garden St., MS 3
Cambridge, MA 02138

Office: B-411
Phone: 617-495-7136

Cygnus X-1


This artist's illustration depicts the principal elements of the Cygnus X-1 system. Cygnus X-1, the first black hole to be discovered, is a so-called stellar-mass black hole, a class of black holes that comes from the collapse of a massive star. The black hole pulls material from a massive, blue companion star toward it. This material forms a disk (shown in red and orange) that rotates around the black hole before falling into it or being redirected away from the black hole in the form of powerful jets (Credit: Chandra press office). Our results on the distance to the Cygnus X-1 system and on the mass and spin of its black hole are available in this press-release and in this feature article, which appeared in Physics World magazine. To view our sequence of three journal papers on Cygnus X-1, click distance, mass and spin.