Research

I am interested in understanding how the large-scale environment affects galaxy evolution. An active member of the DESI collaboration, I am working on updating VoidFinder (Hoyle & Vogeley 2002) to identify the dynamically-distinct voids in the large-scale structure in DESI's upcoming galaxy survey. Not only will we be able to use the voids to study the influence of the void environment on galaxy formation and evolution, we will also be able to measure the BAO radius via cross-correlations with the defined voids.

I am also working with Prof. Segev BenZvi at the University of Rochester to spectroscopically identify transient objects observed by DESI. Starting with the ability to discern different supernova types from their spectroscopic signatures, we hope to develop the ability to identify "strange" objects observed during the survey.

In addition, I am also developing a photometric classification scheme to identify galaxies in the Green Valley of the color-magnitude diagrams. This transient population will allow us to study galaxies transitioning between the star-forming Blue Cloud to the queiscent Red Sequence, incluidng understanding the various quenching mechanisms responsible for shutting down a galaxy's star formation.

My PhD thesis compared dwarf galaxies in voids with dwarf galaxies in more dense environments, in an effort to understand how a galaxy's environment affects its star formation history and chemical evolution. My work on the oxygen and nitrogen abundances in blue, star-forming dwarf galaxies in SDSS indicates that the void galaxies are retarded in their star formation and that they have larger dark-matter-halo-mass to stellar-mass ratios than dwarf galaxies in more dense environments.

  • Publications

    Dependence of the ratio of total to visible mass on observable properties of SDSS MaNGA galaxies. K.A. Douglass and R. Demina. (2020) Submitted to ApJ. arXiv:2009:10083

    The influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies. K.A. Douglass, J.A. Smith, and R. Demina. (2019) ApJ, 886: 153-161. arXiv:1906.08327

    Large-scale environmental dependence of chemical abundances in dwarf galaxies and implications for connecting star formation and halo mass. K.A. Douglass, M.S. Vogeley, and R. Cen. (2018) ApJ, 864 (2): 144-160. arXiv:1706.07099

    Large-scale environmental dependence of the abundance ratio of nitrogen to oxygen in blue, star-forming galaxies fainter than L*. K.A. Douglass and M.S. Vogeley. (2017b) ApJ, 837 (1): 42-55. arXiv:1612.04908

    Determining the large-scale environmental dependence of gas-phase metallicity in dwarf galaxies. K.A. Douglass and M.S. Vogeley. (2017a) ApJ, 834 (2): 186-198. arXiv:1604.08599

  • People


  • Graduate students

  • Nesli Erez (UR, 2019-present)
    Dylan Veyrat (UR, 2018-present)
    Gregory Zengilowski (UR, 2017-18)

  • Undergraduate students

  • Yinglei Peng (UR, Spring 2021 - present)
    Debra Dunham (CSB/SJU, NSF REU, Summer 2020)
    Uzair Tahamid Siam (UR, Summer 2020 - present)
    Yifan Zhang (UR, Spring 2020 - present)
    Cindy Olvera Perez (CSU Chico, CAMPARE REU, Summer 2019)
    Kaelyn Dauer (CSU Fresno, CAMPARE REU, Summer 2019)
    Joshua Lemberg (UR, Spring 2019 - Summer 2020)
    Fatima Zaidouni (UR, Fall 2018 - present)
    Michaela Guzzetti (Smith College, NSF REU, Summer 2018)
    Jacob Smith (UR, Spring 2018 - Spring 2019)
    Leilani Gamboa (UR, Spring 2018 - Spring 2020)
    Andrew Klug (UR, Spring 2018)
    Daniele Schneider (Drexel, 2016-17)
    Jinfu Dai (Drexel, 2015-16)
    Salvatore Zerbo (Drexel, STAR, Summer 2015)
    Brean Prefontaine (Drexel, STAR, Summer 2014)