Seminars and Colloquia at ESO Garching and on the campus

January 2019

21/01/19 (Monday)
11:00, Library (ESO HQ, Garching) | ESO Garching
ESO/MPA/MPE "Gas Matters" Club
Talk — What can we learn about the interstellar medium of nearby (and high-z) galaxies using far-infrared lines?
Rodrigo Herrera-Camus (MPE)
15:30, MPA Large Seminar Room E.0.11 (MPA, Garching) | ESO Garching
MPA Institute Seminar
Talk — Joint image-visibility studies of the Sunyaev-Zeldovich effect
Luca di Mascolo (MPA)
17:15, HS2, Physik TUM Garching | ESO Garching
Muenchener Physik Kolloquium
Talk — Electronic structure and electron dynamics in two-dimensional materials
Philip Hofmann (Aarhus Univ.)
22/01/19 (Tuesday)
10:00, Fornax (ESO HQ, Garching) | ESO Garching
Star and Planet Formation Seminar
Talk — (topic to be announced)
Dominique Segura-Cox (MPE)
11:00, MPA Large Seminar Room E.0.11 (MPA, Garching) | ESO Garching
Cosmology Seminar
Talk — How galaxies form stars: the connection between local and global star formation in galaxies
Vadim Semenov (Univ. Chicago)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — Accurate imaging in radio interferometry: Optimal gridding and degridding
Haoyang Ye (University of Cambridge)

Abstract

The discussion on the choice and performance of different gridding functions can be dated back to 1960s by Liz Waldram in Radio Astronomy group at Cavendish. In radio interferometry imaging process, the Fourier transform relation between the visibility data and the sky brightness distribution is usually implemented by Fast Fourier Transform (FFT), where a procedure called ‘gridding’ of convolving visibilities with a chosen gridding function is needed to assign visibility values into uniformly sampled grids. The spheroidal function has been widely used to suppress aliasing effects since early 1980s. We proposed "Least-misfit gridding function" under the criteria of minimising the difference between the DFT and FFT results. It is proved to have a better aliasing suppression performance than the spheroidal function on simulated dataset. It also minimises the DFT and FFT difference, outperforming the spheroidal function at least 10^2 times with the same gridding width and image cropping ratio. The least--misfit gridding function with a support width of 7 and an image cropping rate of 0.5 is recommended to be applied both into gridding and degridding process, so as to achieve the single precision in terms of the image misfit and visibility misfit respectively. Its application on our newly proposed wide-field imaging method can achieve the single and double precision with the gridding width equals to 7 and 14 respectively.

16:15, MPP, Freimann, Munich | ESO Garching
MPP Kolloquium
Talk — Asymptotic symmetries of gravity
Marc Henneaux (Univ. of Brussels)
23/01/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — ELT Instrumentation Q&A
Joël Vernet, Ralf Siebenmorgen, Vincenzo Mainieri, Suzanne Ramsay (ESO)

Abstract

As a sequel to the Q&A session on the ELT telescope, the Project Scientists of the ELT instruments will provide an opportunity to ask question on those facilities.

A short introduction to METIS, HARMONI, MICADO+MAORY, MOSAIC and HIRES instruments will be given. Thereafter, the floor will be open for questions.

11:00, MPE Old Seminar Room 209 | ESO Garching
High Energy Seminar
Talk — Simulation of eROSITA Observations of Supernova Remnant Candidates
Gerson Rodrigues (HEG, MPE)
24/01/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Cosmic and other Bell Tests
Anton Zeilinger (Institute for Quantum Optics and Quantum Information Austrian Academy of Sciences and University of Vienna)

Abstract

In experiments on Bell’s theorem the possibility is tested whether local realistic explanations of the correlations between entangled particles can explain the observed correlations. In the talk, I will first discuss possible loopholes in tests of Bell‘s Inequalities. I will then focus on the so-called freedom of choice loophole. This loophole is related to the demand that the measurements of correlations on two (or in principle more) entangled particles are free and independent. I will then in detail report on tests of Bell’s Inequality where cosmic sources are used to provide independent random input for the measurements t entangled photons. In the first experiment, stars within our Milky Way were used and in the second one, distant quasars. Another experiment has used choices of random numbers by humans. These numbers were directed to 13 experiments located globally at 12 different places. Finally, I will briefly mention the implementation of quantum cryptography between Europe and China using the Chinese quantum satellite Micius.

28/01/19 (Monday)
10:45, Library (ESO HQ, Garching) | ESO Garching
KES: Knowledge Exchange Series
Talk — Cold gas in galaxies
Martin Zwaan (ESO)
29/01/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — Galactocentric variation of the gas-to-dust ratio and its relation with metallicity
Andrea Giannetti (Istituto di Radioastronomia, Bologna)

Abstract

The assumption of a gas-to-dust mass ratio is a common approach to estimate the basic properties of molecular clouds, from (sub)mm continuum observations of the dust. In the Milky Way a single value is used at all galactocentric radii, independently of the observed metallicity gradients. Both models and extragalactic observations suggest that this quantity increases for decreasing metallicity Z, typical of the outer regions in disks, where fewer heavy elements are available to form dust grains. We investigate the variation of the gas-to-dust ratio as a function of galactocentric radius and metallicity, to allow a more accurate characterisation of the quantity of molecular gas across the galactic disk, as derived from observations of the dust.

Observations of the optically thin C18O (2-1) transition were obtained with the APEX telescope for a sample of 23 bright star-forming regions in the far outer Galaxy (Rgc>14 kpc). From the modelling of this line and of the spectral energy distribution of the selected clumps we compute the gas-to-dust ratio and compare it to that of well-studied sources from the ATLASGAL TOP100 sample in the inner galactic disk. The gas-to-dust ratio is found to increase with galactocentric radius, whereas the dust metallicity decreases, the most common situation also for external late-type galaxies, suggesting that grain growth dominates over destruction. The predicted gas-to-dust ratio is in excellent agreement with the estimates in Magellanic clouds, for the appropriate value of Z.

30/01/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Peter Scicluna (ASIAA)
31/01/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Stellar Population Models
Claudia Maraston (University of Portsmouth)

February 2019

06/02/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Sherry Suyu (MPA)
07/02/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — The New Era of Stellar Physics
Matteo Cantiello (Center for Computational Astrophysics, NYC & Princeton University)

Abstract

Stellar astrophysics is undergoing a renaissance driven by new observational and theoretical capabilities. Wide-field time-domain surveys have uncovered new classes of stellar explosions, helping to understand how stars evolve and end their lives. Gravitational-wave astronomy is providing exciting insights in the properties of the final remnants of massive stars. Asteroseismology, the study of waves in stars, is also producing dramatic breakthroughs in stellar structure and evolution. Thanks to space astrometry, accurate distances are now available for an unprecedented number of galactic stars. From the theoretical standpoint, it is increasingly possible to study aspects of the three-dimensional structure of stars using targeted numerical simulations. These studies can then be used to develop more accurate models of these physics in one-dimensional stellar evolution codes.

I will review some of the most important results in stellar physics of the last few years, and highlight what are the most relevant puzzles that still need to be solved. I will put particular emphasis on the physics of massive stars, which are the progenitors of core-collapse supernovae, gamma-ray bursts and the massive compact remnants observed by LIGO.

11/02/19 (Monday)
10:45, Library (ESO HQ, Garching) | ESO Garching
KES: Knowledge Exchange Series
Talk — What we learned from the CMB
Eiichiro Komatsu (MPA)
12/02/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Fei Yan (MPIA, Heidelberg)
13/02/19 (Wednesday)
10:15, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Oscar Morata (ASIAA)
14/02/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Exoplanetary Atmospheres
Nikku Madhusudhan (Institute of Astronomy, University of Cambridge)
19/02/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Marko Stalevski (Astronomical Observatory of Belgrade)
20/02/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Francesco Belfiore (ESO)
21/02/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — (topic to be announced)
Jessica K. Werk (University of Washington, USA)
25/02/19 (Monday)
10:45, Library (ESO HQ, Garching) | ESO Garching
KES: Knowledge Exchange Series
Talk — Dynamical Scaling Laws of Nearby Galaxies
Federico Lelli (ESO)
27/02/19 (Wednesday)
10:45, Library (ESO HQ, Garching) | ESO Garching
Informal Discussion
Talk — (topic to be announced)
Michele Perna (INAF, Osservatorio Astrofisico di Arcetri)

March 2019

11/03/19 (Monday)
10:45, Library (ESO HQ, Garching) | ESO Garching
KES: Knowledge Exchange Series
Talk — Gaia and its impact on astronomy 10 months after DR2
Richard Anderson (ESO)
12/03/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Peter Scicluna (ASIAA)
14/03/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — The Imaging X-Ray Polarimetry Explorer
Martin C. Weisskopf (NASA's Marshall Space Flight Center)
19/03/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Rolf Kuiper (University of Tübingen)
21/03/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Star formation simulations
Stefanie Walch (University of Cologne)
25/03/19 (Monday)
10:45, Library (ESO HQ, Garching) | ESO Garching
KES: Knowledge Exchange Series
Talk — AGN feedback
Chris Harrison (ESO)
28/03/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Solar models, neutrinos
Aldo Serenelli (Institute of Space Sciences, Spain)

April 2019

04/04/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — AGN radio observations
Raffaella Morganti (ASTRON Netherlands Institute for Radio Astronomy)
09/04/19 (Tuesday)
12:00, Library (ESO HQ, Garching) | ESO Garching
Lunch Talk
Talk — (topic to be announced)
Oscar Morata (ASIAA)
11/04/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Obscured AGN and outflows
Nadia Zakamska (Johns Hopkins University)

May 2019

02/05/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — GAIA results and discoveries
Vasily Belokurov (University of Cambridge)
09/05/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Atmospheres of Exosolar Planets
Laura Kreidberg (Harvard Astronomy Department)
16/05/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Cosmic Magnetism
Sui Ann Mao (Max Planck Institute for Radioastronomy)
23/05/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Ly alfa haloes
Joël Vernet (ESO)

June 2019

06/06/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — (topic to be announced)
Mathilde Jauzac (Durham University)
13/06/19 (Thursday)
15:15, Auditorium Eridanus (ESO HQE, Garching) | ESO Garching
Munich Joint Astronomy Colloquium
Talk — Chemical evolution of the Milky Way
Else Starkenburg (Leibniz-Institut für Astrophysik Potsdam)
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)

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Past Talks

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