Professional Bio


  • Ph.D, Astrophysical and Planetary Sciences, University of Colorado, 2010
  • M.S., Astronomy, San Diego State University, 1999
  • B.S., Astronomy and Astrophysics, Villanova University, 1996

Academic Preparation

  • Doctoral Dissertation: "A Multi-wavelength Study of Active Galactic Nuclei in Clusters of Galaxies"
    Thesis Advisor: John T. Stocke
  • Master's Thesis: "Doppler Tomography of the Accretion Disk in the Algol Binary KU Cygni"
    Thesis Advisor: Paul B. Etzel
  • Research Project: Modeling of UV spectra of cataclysmic variable stars in quiescence and in outburst. Advisor: Edward M. Sion

Research & Scholarship

Research Activities

Assistant Professor, Regis University Fall 2010-present
I am extending my doctoral research to explore the X-ray emitting gas in clusters of galaxies and to search for observational clues that a distributed population of cluster active galactic nuclei can e ectively halt cooling near the centers of clusters.

Graduate Student Researcher, CU-Boulder Fall 2005-2010
Thesis research focuses on a multi-wavelength study of X-ray and radio-selected AGN in 22 clusters of galaxies out to z1. Analyzing new and archival datasets from X-ray, radio, and optical observatories, each requiring di erent processing and analysis techniques, to determine cluster AGN physics (e.g. colors, luminosities, spatial locations) and their contri-
bution to feedback processes in the intra-cluster medium. I also examined Chandra X-ray observations of potentially low surface brightness clusters and estimated their e ect on the cluster X-ray luminosity function out to z0.5.

Researcher, Univ. of California, San Diego Mar. 2001-Jul. 2003
Atmospheric Research Laboratory, Scripps Institution of Oceanography Supervisor: Francisco P.J. Valero Utilized atmospheric radiative transfer and Mie scattering codes to model radiative properties of the atmosphere, clouds and aerosols. Comparisons displayed discrepancies between individual models, as well as with observations.

Refereed Publications

Q. N. Hart, J. T. Stocke, A. E. Evrard, E. E. Ellingson, and W. A. Barkhouse. "The Evolution of Radio Galaxies and X-Ray Point Sources in Coma Cluster Progenitors since z 1.2". The Astrophysical Journal, 740:59-, September. 2011.

Hart, Q. N.. Dissertation, "A Multi-wavelength Study of Active Galactic Nuclei in Clusters of Galaxies". July, 2010.

Hart, Q. N., J. T. Stocke, and E. J. Hallman. "X-ray Point Sources and Radio Galaxies in Clusters of Galaxies." The Astrophysical Journal, 705:854-867, Nov. 2009.

F. P. J. Valero, S. K. Pope, B. C. Bush, Q. Nguyen, D. Marsden, R. D. Cess, A. S. Simpson-Leitner, A. Bucholtz, and P. M. Udelhofen. "Absorption of solar radiation by the clear and cloudy atmosphere during the Atmospheric Radiation Measurement Enhanced Shortwave Experiments (ARESE) I and II: Observations and models". Journal of Geophysical Research (Atmospheres) 108:4016, Jan. 2003.

J. F. Dolan, A. G. Michalitsianos, Q. T. Nguyen, and R. J. Hill. "Ultraviolet Spectral Variability and the Ly Forest in the Lensed Quasar Q0957+561". ApJ, 539:111{123, Aug. 2000.

Q. Nguyen, D. Fabian, K. Belle, M. Huang, and E. M. Sion. "Rotationally Broadened Synthetic Spectra for HST and IUE Observations of Exposed White Dwarfs in Cataclysmic Variables". PASP, 110:39-46, Jan. 1998.