The Quasar Absorption Line - Galaxy Evolution Group

Studying the Baryon Cycle and the Evolution of Galaxies

We are a collaborative group of the Astronomy Departments at New Mexico State University, Penn State, and Swinburne University of Techonology (Australia). We are engaged in research using the technique of quasar absorption lines to study the kinematic, ionization, and chemical conditions of gas associated with intermediate and high redshift galaxies and simulations to understand the general evolution of galaxies. Our goals are to contribute to the growing body of knowledge of the role of gas in galaxy formation and evolution. For the public, we have published An Overview of Our Science.

Links to Our Main Projects

| The Multiphase Galaxy Halo Project (MGHP) | The MgII Absorber-Galaxy Catalog (MAGiiCAT) |




(Penn State)







(South Carolina)


James Lewis

Multiphase Galaxy Halo Project
(selected publications)
The Relation Between Galaxy ISM and Circumgalactic OVI Gas Kinematics Derived from Observations and ΛCDM Simulations Kacprzak, G.G., Vander Vliet, J.R., Nielsen, N.M., Muzahid, S., Pointon, S.K., Churchill, C.W., Ceverino, D., Arraki, K.S., Klypin, A., Charlton, J.C., Lewis, J., 2018, ApJ, in press (arXiv:1811.06028)
The Impact of the Group Environment on the OVI Circumgalactic Medium Pointon, S.K., Nielsen, N.M., Kacprzak, G.G., Muzahid, S., Churchill, C.W., & Charlton, J. C. 2017, ApJ, 844, 23
The Highly Ionized Circumgalactic Medium is Kinematically Uniform Around Galaxies Nielsen, N.M., Kacprzak, G.G., Sowgat, M., Churchill, C.W., Murphy, M.T., & Charlton, J.C., 2017, ApJ, 834, 148
The Azimuthal Dependence of Outflows and Accretion Detected Using OVI Absorption Kacprzak, G.G., Muzahid, S., Churchill, C.W., Charlton, J.C., & Nielsen 2015, ApJ, 815, 22
An Extreme Metallicity, Large-Scale Outflow from a Star-Forming Galaxy at z~0.4 Muzahid, S., Kacprzak, G.G., Churchill, C.W., Charlton, J.C., Nielsen, N.M., Mathes, N.L., & Trujillo-Gomez, S. 2015, ApJ, 811, 132
Direct Insights into Observational Absorption Line Analysis Methods of the Circumgalactic Medium Using Cosmological Simulations Churchill, C.W., Vander Vliet, J.R., Trujillo-Gomez, S., Kacprzak, G.G., & Klypin, A. 2015, ApJ, 802, 10

MgII Absorber-Galaxy Catalog
(series publications only)
MAGiiCAT VI. The Circumgalactic Medium in Group Environments Nielsen, N.M., Kacprzak, G.G., Churchill, C.W., Pointon, S.K., & Murphy, M.T. 2017, ApJ, in press (arXiv:1808.09562)
MAGiiCAT V. Orientation of Outflows and Accretion Determined the Kinematics and Column Densities of the Circumgalactic Medium Nielsen, N.M., Churchill, C.W., Kacprzak, G.G., Murphy, M.T., & Evans, J.L. 2015, ApJ, 812, 83
MAGiiCAT IV. Kinematics of the Circumgalactic Medium Nielsen, N.M., Churchill, C.W., Kacprzak, G.G., Murphy, M.T., & Evans, J.L. 2016, ApJ, 818, 171
MAGiiCAT III. Interpreting the Self-Similarity of the Circumgalactic Medium with Virial Mass using MgII Absorption Churchill, C.W., Trujillo-Gomez, S., Nielsen, N.M, & Kacprzak, G.G., 2013, ApJ, 779, 87
MAGiiCAT II. General Characteristics of the MgII Absorbing Circumgalactic Medium Nielsen, N.M., Churchill, C.W., & Kacprzak, G.G. 2012, ApJ, 776, 115
MAGiiCAT I. The MgII Absorber-Galaxy Catalog Nielsen, N.M., Churchill, C.W., & Kacprzak, G.G. & Murphy, M.T. 2013, ApJ, 776, 114

This page maintained by Chris Churchill; last update: Nov 2018