Nicolas Lehner

Research Professor, Department of Physics & Astronomy

Research Professor, Department of Physics & Astronomy

333E Nieuwland Science Hall
Notre Dame, IN 46556
+1 574-631-5755

Research Interests

My main research interests focus on understanding how galaxies form and evolve into the objects we see today. Using multi-wavelength spectroscopy and imaging space-based and ground-based observations, my aim is to determine if the basic principles of galaxy growth models are correct and to empirically characterize the large-scale flows of baryons in and out of galaxies that drive the evolution of galaxies over cosmic time.


B.Sc., Universite Louis Pasteur, France, 1994
M.Sc., ibid., 1995
Ph.D., The Queen’s University of Belfast, N. Ireland, 2000


Lehner, N., Howk, J.C., O’Meara, J., Prochaska, J.X., Fumagalli, M.: The cosmic Evolution of the Metallicity Distribution of Ionized Gas Traced by Lyman Limit Systems. The Astrophysical Journal, 833, 283 [34 pp] (2016).

Wotta, C., Lehner, N., Howk, J.C., O’Meara, J., Prochaska, J.X.: Low-Metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z<1. The Astrophysical Journal, 831, 95  [23 pp] (2016).

Fox, A.J., Lehner, N., Lockman, J.F., Wakker, B.P., Hill, A.S., Heitsch, F., Stark, V., Barger, K.A., Sembach, K.R., Rahman, M.: On the Metallicity and Origin of the Smith High-Velocity Cloud. The Astrophysical Journal Letters, 816, 11 [6 pp] (2016).

Lehner, N., Howk, J.C., Wakker, B.P.: Evidence for a Massive, Extended Circumgalactic Medium around the Andromeda Galaxy. The Astrophysical Journal, 804, 79 [21 pp] (2015).

Lehner, N., O’Meara, J., Fox, A., Howk, J.C., Prochaska, J.X., Wolfe, A.M., Burns, V., Armstrong, A.: KODIAQ Survey I: Galactic and Circumgalactic OVI  at 2The Astrophysical Journal,  788, 119  (2014).

Lehner, N., Howk, J.C., Tripp, T.M., Tumlinson, J., Prochaska, J.X., O’Meara, J., Thom, C., Werk, J.K., Fox, A.J., Ribaudo, J.: The Bimodal Metallicity Distribution of the Circumgalactic Medium at z ≤ 1. The Astrophysical Journal, 770, 138 [32 pp] (2013).