Seminars and Colloquia at ESO Garching and on the campus

June 2019

25/06/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — Downsizing of Star Formation: Weighing Dark Matter Haloes Hosting Dusty Star-Forming Galaxies
Kirsten Hall (Johns Hopkins University)

Abstract

Powerful quasars can be seen out to large distances. As they reside in massive dark matter haloes, they provide a useful tracer of large-scale structure. Stacking far-infrared and sub-millimeter maps on the locations of quasars has proved a useful tool in studying quasars and their environments. We stack Herschel-SPIRE images at 250, 350, and 500 μm at the location of 11,235 quasars in 10 redshift bins spanning 0.5 ≤ z ≤ 3.5. The unresolved dust emission of the quasar and its host galaxy dominate on instrumental beam scales, while extended emission is spatially resolved on physical scales of order a megaparsec. This emission is due to dusty star-forming galaxies (DSFGs) clustered around the dark matter haloes hosting quasars. We measure radial surface brightness profiles of the stacked images to compute the angular correlation function of DSFGs correlated with quasars. We then model the profiles to determine large-scale clustering properties of quasars and DSFGs as a function of redshift. We adopt a halo model and parametrize it by the most effective halo mass at hosting star-forming galaxies, finding log(M_eff/M_⊙)=(13.8+/0.1) at z = 2.21-2.32, and, at z = 0.5-0.81, the mass is log(M_eff/M_⊙)=(10.7+/-0.2). Our results indicate a downsizing of dark matter haloes hosting DSFGs between 0.5 ≤ z ≲ 2.9. The derived dark matter halo masses are consistent with other measurements of star-forming and sub-millimeter galaxies. The physical properties of DSFGs inferred from the halo model depend on details of the quasar halo occupation distribution in ways that we explore at z > 2.5, where the quasar HOD parameters are not well constrained.

27/06/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Evolution of ICM Structure, Metallicity and BCGs out to z~1.7 with SPT Clusters
Michael McDonald (MIT Kavli Institute)
28/06/19 (Friday)
14:00, MPA Large Seminar Room E.0.11 (MPA, Garching) | ESO Garching

July 2019

02/07/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — Observing and Simulating the Circum-Galactic Medium
Ramona Augustin (LAM)
04/07/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — (topic to be announced)
Hans-Walter Rix (MPIA, Heidelberg)
09/07/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Milena Valentini (Scuola Normale Superiore, Pisa)
16/07/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — Galaxies lacking dark matter in the Illustris simulation
Moritz Haslbauer (Bonn University)

September 2019

03/09/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Anne Klitsch (ESO)
17/09/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Michael Hammer (Department of Astronomy and Steward Observatory)

November 2019

12/11/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Frank Rieger (ZAH University of Heidelberg)
19/11/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Amy Barger (Dept of Astronomy, UW-Madison)

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Past Talks

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