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Faculty & Staff Directory

Alberto C. Sadun, Ph.D.

Professor of Physics

Email: Alberto Sadun
Office Location: North Classroom 3809
Phone: (303) 556-6256
Fax: (303) 556-6257
Office hours: T-Th 3:00-4:00 p.m.
Areas of Expertise:
Extragalactic astrophysics


Education & Degrees

Ph.D., Physics, MIT, 1984
B.S., Physics, MIT, 1977


I am a professional astronomer specializing in extragalactic astrophysics. In particular, I am interested in quasars and quasar jets. These are supermassive black holes which are the precursors to normal galaxies. My research consists of making observations in the optical (visual) of particularly violent active galactic nuclei (AGN), aptly named blazars.

I use remote observing to take images of blazars when they are active, and download those images. I calibrate and measure the images with proprietary software to get the brightness of the AGN. The data acquired is then passed on to others who combine our data with data taken at similar times in radio, X-ray, and very high energy gamma-ray wavelengths.

This multifrequency campaign paints an entire picture of the behavior of the system over the course of several months. We then analyze the data to determine the size and mass of the supermassive black hole, the structure of the accretion disk surrounding the black hole, the presence or absence of extragalactic jets, and the radiation mechanisms involved.

Select Publications

  • GIOMMI, P., et al. "The Spectral Energy Distribution of Fermi bright blazars." Astrophys. J. 716, 30-70 (2010).
  • VERCELLONE, S., D’AMMANDO, F., et al Multiwavelength observations of 3C 454.3. III. "Eighteen months of AGILE monitoring of the 'Crazy Diamond'” Astrophys. J. 712, 405-420 (2010).
  • Abdo, A., et al.  Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October.  Astrophys. J. 726, 43-56 (2011).

  • Raiteri, C. M., Villata, M., et al.  The long-lasting activity of 3C 454.3.  GASP-WEBT and satellite observations in 2008-2010.  Astron. Astrophys. 534, A87 (2011).

  • Asadi-Zeydabadi, M., and Sadun, A. C.   One-dimensional relativistic dynamics with scaling formalism. Euro. J. Phys. 33,  1-7 (2012).

  • Acciari, V. A., et al.  TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008.  Astrophys. J. 738, 25 (2011).

Courses Taught

Phys 2010: College Physics I
Phys 2020: College Physics II
Phys 3040: Modern Cosmology
Phys 3050: General Astronomy II