Making Galaxy Formation Great Again

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 Time:  Thursday, June 14, 2018, 02:00pm
 Title:  Making Galaxy Formation Great Again
 Speaker:  Prof. Neal Katz (Univ. of Massachusetts)
 Location:

蒙民伟科技南楼S727


ABSTRACT

QSO absorption line studies of the CGM using HST COS are the best direct way to study the accretion and galactic wind processes that are thought to dominate galaxy formation. Detailed numerical simulations are critical to interpret and understand these observations. Unfortunately, simulations are sensitive to wind implementations. Interactions at wind/halo gas interfaces in the CGM occur on scales that are much below the resolution of any current or near future galaxy formation simulation, making a "brute force" approach not viable. To mitigate this impasse, we propose to implement a new wind algorithm that explicitly models the "subgrid physics" in the wind-halo gas interaction analytically within a simulation, using the simulation to provide the physical characteristics that will inform the interaction. Unavoidably, this introduces a few free parameters but we can restrict them by matching observed galaxy Previous simulations using a more standard wind model approaches reproduced many observed properties of galaxies and metal-line absorption, but our new wind implementation will allow us to tie empirical successes, and failures, more securely to the underlying wind physics, both the ejection (mass-loading factors and ejection speeds) and the interaction between the wind and gaseous halo, and allow us to identify absorption line features with specific physical processes.

BIO
Education
Princeton University
Princeton, New Jersey 1984–1989 PhD in Astrophysics, 1989. Advisor: James E. Gunn
Thesis: “A Galaxy Formation Cookbook: Recipes and Utensils”

University of Michigan
Ann Arbor, Michigan 1980–1984
BS (High Honors and High Distinction) in Astronomy, Mathematics, and Physics, 1984.

Professional Employment
Professor of Astronomy, University of Massachusetts 2005–
Director of Computational Astrophysics, University of Massachusetts 2003–
Associate Professor of Astronomy, University of Massachusetts 2000–2005
Assistant Professor of Astronomy, University of Massachusetts 1997–2000
Research Assistant Professor of Astronomy, University of Washington 1994–1996
Postdoctoral Fellow, Massachusetts Institute of Technology 1991–1993
Postdoctoral Fellow, University of Arizona 1989–1991

Fellowships and Honors
Fulbright Scholar 2017–2019
ISI Highly Cited Scientist 2004– Hubble Fellow 1991–1993
Bok Fellow 1989–1991
NATO Postdoctoral Fellowship (declined) 1989
Ray Grimm Memorial Prize in Computational Physics 1988
John von Neumann Fellowship in Supercomputing 1987–88
National Science Foundation Honorable Mention 1985
Princeton University Prize Fellowship 1984–85


Slides: 20180614-Katz.pdf