- 1 May 2015: Our group is excited to be hosting the annual New England Regional Quasar and AGN Meeting at Dartmouth on Thursday June 4. See the full meeting site for abstract submission, travel details, and other information.
- 22 April 2015: Chien-Ting Chen has successfully defended his Ph.D. thesis titled "Supermassive Black Hole Accretion and Connections to Star Formation in Galaxies". He will be moving to Penn State this summer for a postdoctoral position with Prof. Niel Brandt focusing on data from NuSTAR. Congratulations Dr. Chen!
- 18 April 2015: Graduate student Seth Cohen's paper on star formation and
structure in galaxy clusters using SDSS and WISE data has been accepted
to The Astrophysical Journal. Congratulations to Seth on accepting a position as a
teacher of Astronomy and Physics at St. Paul's School in Concord, NH.
- 13 April 2015: Undergraduate Tom Whalen '14 (currently at the Chandra X-ray Center) has had his paper on X-ray emission from the dwarf starburst galaxy Henize 2-10 (right, image courtesy NASA/CXC) accepted to The Astrophysical Journal.
- 20 Jan 2015: Graduate student and Neukom Graduate Fellow Chien-Ting Chen's paper on the
connection between star formation and dust obscuration in quasars has
been accepted by The Astrophysical Journal.
research group and opportunities
I am an observational astrophysicist, with interests in active galactic nuclei, galaxy evolution, large-scale structure of the Universe, the cosmic X-ray background, and X-ray binary stars. My work uses data from the Chandra, XMM-Newton, Hubble, Spitzer, Herschel, and WISE space telescopes as well as ground-based optical, infrared, and radio observations.
I joined the Department of Physics and Astronomy at Dartmouth College as an Assistant Professor in December 2011. My research is generously funded by the NSF, NASA, and an Alfred P. Sloan Research Fellowship, and for 2014-15 I will be the Dartmouth Class of 1962 Faculty Fellow. My full CV is here. I am looking for interested and motivated students to take part in an exciting research program.
Current research group members:
black holes, dark matter halos, and the
evolution of galaxies
Much of our research focuses on the interplay between the growth of galaxies, their parent dark matter halos, and the central supermassive black holes. A remarkable success in astrophysics in the past decade has been the emergence of a physical framework for how galaxies form and evolve over the history of the Universe. Our work explores some interesting and perhaps unexpected elements of this picture: how the gravitational potential of the dark matter halos that surround galaxies, as well as the energy released by growing supermassive black holes at their centers, can profoundly influence the physical state of interstellar gas and the formation of stars. We are just starting to explore these processes in detail with observations, thanks to powerful new telescopes and multiwavelength surveys.
For an extensive review of black hole and galaxy evolution research motivated by our 2010 workshop in Durham on What Drives the Growth of Black Holes?, see our review article (Alexander & Hickox 2012) in New Astronomy Reviews.
For a brief overview of this field geared toward a more general audience, see Supermassive Black Holes and the Growth of Galaxies, which appeared in the UK magazine The Astronomer in March/April 2011.
Click here for more details on the research program and links to publications.
CDFS stacked rest-frame spectra
As part of a Chandra archive data analysis program (SP8-9001), we have extracted rest-frame X-ray spectra for all sources with robust spectroscopic redshifts in the 4 Ms Chandra Deep Field South. For publicly available cleaned event files and spectra click here.