Christopher M Carroll

PhD Candidate ― Dartmouth College


PhD candidate in the Department of Physics & Astronomy at Dartmouth College.

Member of the Black Holes and Galaxies group, lead by Prof. Ryan Hickox.

Research focus on active supermassive black holes and their properties with large data sets.


It is believed that supermassive black holes reside at the centers of all galaxies. These black holes can accrete large amounts of interstellar matter, releasing enormous amounts of radiation. These active galactic nuclei (AGNs) have been studied for decades to understand their physical properties and the impact on their host galaxies.

Obscured quasars account for a large fraction of the total number of powerful AGNs. Dust extinction obscures nuclear emission and allows us to observe their host galaxies. Recently, I have uncovered a population of obscured AGNs which lack typical X-ray detections for such luminous sources. I am currently modeling these AGNs to better understand the column densities of this obscuring material responsible for the attenuation of X-ray emission.

A short list of recent publications I have contributed to:

  • Yan, W. et al. 2019, ApJ, 870, 33. "NuSTAR and Keck Observations of Heavily Obscured Quasars Selected by WISE"

  • Masini, A. et al. 2018, ApJ, 867, 162. "The NuSTAR Extragalactic Surveys: Unveiling Rare, Buried AGNs and Detecting the Contributors to the Peak of the Cosmic X-Ray Background"

  • DiPompeo, M.A. et al. 2018, ApJ, 856, 76. "The [OIII] Profiles of Infrared-selected Active Galactic Nuclei: More Powerful Outflows in the Obscured Population"

  • Hviding, R.E. et al. 2017, MNRAS, 474, 1955. "Characterizing theWISE-selected heavily obscured quasarpopulation with optical spectroscopy from the Southern African Large Telescope"


Here are some of the libraries I use frequently:






I have a variety of teaching experiences in astronomy, physics, and general science. As a teaching assistant I have been responsible for lab sections and courses, at both undergraduate and graduate level. I have been invited to teach a number of classes throughout the year when professors were unavailable.

I spent the 2014-2015 academic year in K-12 education, where I acquired 300+ hours of classroom experience co-teaching 8th grade physical science as an NSF GK12 Fellow. I assist in mentoring the undergraduate research assistants in our group.

In addition, I am also a registered substitute for SAU 70.


A list of outreach events I am involved in:

Public Observing

NH Academy of Science
Guest Speaker

Science Day

Astronomy Day


Contact Me



Wilder Laboratory 308
Hanover, NH 03755
(603) 646-3431