Seminars and Colloquia at ESO Garching and on the campus

July 2019

18/07/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Special Talk
Talk — The mystery of multiple populations in globular clusters
Carmela Lardo (École Polytechnique Fédérale de Lausanne)

Abstract

The discovery that stars in globular clusters do not fit within the traditional picture of hosting stars with the same age and chemical composition has led to a renewed interest in globular cluster studies. Indeed, it has been discovered that these complex systems host stars with variations in many elements like helium, carbon, nitrogen, oxygen, and sodium (a.k.a. multiple populations). Several scenarios have been put forward to explain the origin of the observed variations, but none of them is able to entirely reproduce observations. After more than 30 years from the discovery of multiple populations, their origin is still a mystery. In this talk, I provide an outline of observations of multiple populations and I attempt to highlight topics that are particularly uncertain and which new theoretical and observational studies are likely to lead to important advances.

19/07/19 (Friday)
11:00, MPA Old Lecture Hall 401 | ESO Garching
High Energy Seminar
Talk — Role of buoyancy, turbulence and cooling in the intracluster medium
Rajsekhar Mohapatra (ANU)
23/07/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — A powerful multi-scale and multi-phase wind in a local AGN
Mattia Sirressi (Stockholm University (from September 2019))

Abstract

I will present the results of my master thesis project on quasar feedback and outflows, which have been submitted for publication to MNRAS and announced at https://arxiv.org/abs/1906.00985.

The Active Galactic Nuclei (AGNs) play a major role in the evolution of the galaxies, thanks to their ability to launch powerful outflows. The detection of nuclear X-ray winds, as well as ionised and molecular galactic outflows provide direct evidence of the so called feedback processes in action, whose physics is nevertheless poorly understood. 

I have studied a local AGN hosting a powerful nuclear X-ray wind, using ALMA observations in order to trace, at galactic scales, the molecular ISM kinematics. I found the signature of a possible molecular outflow with v~200 km/s that is potentially able to suppress the star-formation activity. By comparing the energetics of this putative outflow with that of the nuclear wind, I tested the blast-wave AGN feedback scenario favouring a momentum-driven outflow over an energy-driven model. 

I will introduce the scientific background, present the data analysis and discuss the possible interpretations of the results and their implications.

30/07/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — A stellar halo surrounding Omega Cen
Annalisa Calamida

Abstract

I will present results from a catalog of ~1.8 million Omega Cen member stars derived from DECam photometry covering a field of view of ~5x5 degrees  across the cluster and HST data for the innermost regions. The unprecedented accuracy of DECam photometry, the depth and field coverage, combined with HST data for the cluster core, allowed me for the first time to derive the global stellar density profile of Omega Cen based on star counts of red-giant and main-sequence stars from 1 to ~140 arcminutes.

The King and Wilson models fail to reproduce the outermost shape of Omega Cen density profile suggesting that the interaction with the Galactic tidal field and the presence of potential escaper (extra-tidal) stars need to be taken into account to explain the observations. The best fit of Omega Cen density profile is found with the SPES models which include potential escaper stars, confirming the presence of a stellar halo around the cluster. 

31/07/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — Gaia view of Orion
Giacomo Beccari (ESO)

August 2019

07/08/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — Machine Learning methods in Astronomy
Henri Boffin (ESO)
13/08/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Maryam Modjaz (Center for Cosmology and Particle Physics, New York 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)
04/09/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Olivier Hainaut (ESO)
11/09/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — ALMA large program ASPECS
Gergö Popping (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)
18/09/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — ALMACAL
Martin Zwaan (ESO)
25/09/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — Keeping the Joy in Science
Christopher Harrison (ESO)
26/09/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Event Horizon Telescope
Anton Zensus (Max Planck Institute for Radio Astronomy)

October 2019

10/10/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — The interstellar medium of high redshift galaxies
Andrea Ferrara (Scuola Normale Superiore Pisa)

Abstract

In the last decade we have explored the cosmic depths and found a statistically significant number of galaxies well into the Epoch of Reionization. However, our physical knowledge of these pristine objects remains very scant. Investigating the internal structure, interstellar medium and evolution of early galaxies is the next challenge to understand key processes as the cosmic history of baryons, feedback, reionization and metal enrichment of the intergalactic medium, This ambitious plan can be tackled by combining a new generation of physically-rich, high resolution, zoom simulations with data in the sub-mm bands provided by ALMA. This approach will be soon strengthened by the forthcoming JWST power. I will review the present status and the open questions in the field.

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)

December 2019

03/12/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
David Jones (IAC, Tenerife)
10/12/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Ute Lisenfeld (Granada University)

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Past Talks

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