Ruprecht-Karls-Universität Heidelberg
Talks, Seminars, Events

Talks, Seminars, Events

A list of all Physics & Astronomy talks and seminars taking place in Heidelberg can be found at HePhySTO.


Upcoming events


2018-11-14
15:15
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Camilla Hansen (MPIA Heidelberg)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-11-14
16:00
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Michael Hanke (ARI/ZAH)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-11-15
11:15
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Diederik Kruijssen´s group (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2018-11-16
15:00
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Rowan Smith (University of Manchester)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-11-16
15:00
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Rowan Smith (University of Manchester)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-11-20
16:15
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What sets the stellar initial mass function? Why is it so universal?
Patrick Hennebelle (CEA Saclay (France))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal
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Abstract
Stars are building blocks of our Universe. They determine its chemical evolution through nuclear synthesis, they host planets and they determine the evolution of galaxies. The characteristics of stars is predominantly determined by their masses. As such the stellar mass spectrum, also called the initial mass function (IMF), is truly a fundamental quantity to understand how our Universe works. A large number of studies have been performed to infer the IMF and it appears strikingly universal. That is to say, even when measured in rather different environments, the IMF presents no or modest variations. This is an intriguing fact as naive expectations would naturally relate the mass spectrum of stars to quantities such as the Jeans mass which depends significantly on the gas density and gas temperature. During the talk I will review some of the ideas that have been proposed to explain the IMF and discuss their success and failure. I will then present a large sets of simulations in which the initial conditions, the thermodynamics and the numerical resolution are all systematically varied. These simulations reveal that the initial conditions determine the power-law part of the IMF while the gas effective equation of state (EOS), which describe the isothermal to adiabatic transition, sets the peak of the stellar distribution. Analytical models are developed and compared with the simulation results. It is argued that the power-law part of the mass spectrum is due to an interplay between gravity and turbulence that determine the mass spectrum of gas reservoirs from which stars built their masses. The peak on the other hand, occurs at a mass which is 5-10 times the mass of the first Larson hydrostatic cores determined by the effective EOS. We propose that the very reason of the IMF weak variability is that the first hydrostatic core and immediate surrounding collapsing envelope are small scale processes which are nearly independent of the large scale environment characteristics. I will finish the talk by discussing remaining issues and suggests a possible "unifying picture".

2018-11-22
11:15
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Jonas Klueter (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2018-11-23
15:00
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Bertram Bitsch (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-11-23
15:00
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Bertram Bitsch (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-11-27
11:15
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Stellar halos and low surface brightness features in the galaxy outskirts from deep VST surveys
Enrichetta Iodice (INAF-Osservatorio Astronomico di Capodimonte)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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Abstract
In the recent years, a big effort was made to develop deep photometric surveys aimed at studying galaxy structures down to the faintest levels of surface brightness. The VST Early-type GAlaxy Survey (VEGAS) has played a pivotal role in the field, by providing new insight on the faint regions of galaxies and on dwarf galaxies in all environments. About 30% of the VEGAS observing time was dedicated to the Fornax deep survey (FDS), the new multi-band deep survey of the Fornax cluster, covering the whole cluster out to the virial radius, with an area of 26 square degrees around the central galaxy NGC1399 and including the SW subgroup centred on the other bright member NGC 1316. With FDS we can map galaxy stellar halos down to μg ≃ 29−31 mag/arcsec2, detect new and faint (μg ≃ 28−30 mag/arcsec2) features in the intracluster space and trace the spatial distribution of candidate globular clusters inside ∼ 0.5 deg2 of the cluster core. Recently, the light and colour distribution of all the bright early-type galaxies inside the virial radius of FORNAX have been studied and a first comprehensive view of the galaxy structure and evolution as function of the cluster environment has been provided. In this talk I will review the main results obtained from VEGAS/FDS surveys.

2018-11-27
16:15
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Asteroid Vesta and Jupiter's formation: an astrochemical tale
Diego Turrini (INAF-IAPS Rom, Italy)
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2018-11-28
15:15
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Andrew Winter (University of Cambridge)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-11-28
16:00
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Renate Hubele (HdA & ARI/ZAH)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-11-29
11:15
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Rory Smith (KASI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2018-11-30
15:00
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Patzer Colloquium
TBA (TBA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2018-11-30
15:00
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Patzer Colloquium
TBA (TBA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2018-12-04
16:15
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Probing the early universe with neutral hydrogen
Anastasia Fialkov (Institute of Astronomy, Cambridge (UK))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2018-12-06
11:15
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Thorsten Lisker (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2018-12-07
15:00
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TBD
HHSF18
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-12-07
15:00
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HHSF18
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-12-10
11:15
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Katharina Wollenberg (ZAH/ITA)
ITA "blackboard" Colloquium ( Hephysto link )
Philosophenweg, 12, 106

2018-12-11
16:15
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Carbon-enhanced metal-poor stars: probes of first-star nucleosynthesis and galaxy assembly
Timothy C. Beers (University of Notre Dame (USA))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal
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Abstract
Over the course of the past few decades, it has become clear that the class of metal-poor stars known as carbon-enhanced metal-poor (CEMP) stars are powerful probes of a number of areas of interest to contemporary astrophysics. I review the multiple lines of evidence that demonstrate the association of CEMP-no stars (which do not exhibit neutron-capture element enhancements) with the nucleosynthesis products of the very first stars, their likely birth place in low-mass mini-halos, and (once accreted by the halo) their role as tracers of the outer-halo population of the Galaxy. The CEMP-s stars (which exhibit enhancements of the heavy s-process elements), by contrast, are likely to have been born in more massive mini-halos, and serve as tracers of the inner-halo population. The well-known increasing frequency of CEMP-no stars (and newly recognized relative constancy of CEMP-s stars) with declining metallicity, and the identification of the primary groups in the Yoon-Beers diagram of A(C) vs. [Fe/H], provide the means to explore these associations in more detail, and to constrain numerical models of the formation of the Milky Way.

2018-12-12
15:15
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Andreas Bauswein (GSI Helmholtzzentrum für Schwerionenforschung Darmstadt)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-12-12
16:00
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Update on 4MOST
Andreas Quirrenbach (LSW/ZAH)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2018-12-13
11:15
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Paula Jofre (Chile)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2018-12-14
15:00
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Karin Lind (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-12-14
15:00
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Karin Lind (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2018-12-18
16:15
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Star formation from kpc to hundreds of AU scales
Henrik Beuther (MPI for Astronomy (Heidelberg))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2019-01-08
16:15
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The IllustrisTNG Project
Lars Hernquist (Harvard-Smithsonian Center for Astrophysics, Cambridge (USA))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2019-01-10
11:15
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Camilla Hansen (MPIA)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2019-01-14
11:15
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Astrometry and more
Gabriele Rodighiero (MPIA)
ITA "blackboard" Colloquium ( Hephysto link )
Philosophenweg, 12, 106

2019-01-15
16:15
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How can nucleosynthesis constrain explosions? New perspectives using multi-D supernova models
Claudia Travaglio (INAF (Turino))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal
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Abstract
During this seminar I will describe my research program aiming at a better understanding of the physics of supernovae and of the origin of nuclei by increasing the quality and predictive power of numerical models as well as nucleosynthesis calculations. Supernovae play essential roles in the frameworks of many branches of astrophysics: star formation, galaxy dynamics, high-energy astrophysics, galactic chemical evolution, and cosmology. In spite of their ubiquitous presence in astrophysics, there are many uncertainties related to progenitor systems, treatment of the explosions, cross section determinations at such high temperatures, and comparisons with spectra. Most popular results in the field of nucleosynthesis during explosions are still mostly based on one-spatial dimension calculations. The pioneering and very innovative aspect today is the possibility of coupling nucleosynthesis to multidimensional simulations of different type of supernovae. I will show recent results and future perspectives in multi-dimensional calculations of thermonuclear as well as core-collapse supernovae, using tracer particle method for nucleosynthesis. I will illustrate detailed comparison of 1D and 3D supernova models with nucleosynthesis calculations and discussing the needs of multi-D (and where it is needed). Despite the huge investments in nuclear physics experiments, theoretical studies establishing priority lists of reactions to be measured and precision required for astrophysics are currently very limited. During this seminar I will also discuss a priority list for future experiments and improvements in predictions of key nuclear reactions for explosive nucleosynthesis. My expertise in Galactic Chemical Evolution modelling lead to the possibility to study a dependence of the SNe yields on metallicity and their contribution over the galactic age up to reproducing the Solar System composition. During my talk I will refer different times to result of chemical evolution studies with the need of a more clear understanding of the impact of supernovae at the earliest stages of the evolution of galaxies, and their contribution to the Solar System composition. The wealth of information from galactic surveys makes this the ideal time for a theorist to understand the formation and evolution of galaxies with a new generation of chemical evolution models. To this goal, at the end of my talk, I will describe a novel project to model chemo-dynamical evolution of the cosmos, based on a N-body SPH RAMSES code making use of the framework on a moving mesh, adjusting automatically spatial resolution but using a large number of isotopes.

2019-01-17
11:15
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Matteo Mazzarini (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2019-01-18
15:00
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Jeroen Bouwman (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-01-18
15:00
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Jeroen Bouwman (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-01-21
11:15
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How stellar feedback shapes nebular emission from star forming regions
Daniel Rahner (ZAH/ITA)
ITA "blackboard" Colloquium ( Hephysto link )
Philosophenweg, 12, 106

2019-01-22
16:15
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Hunting ghostly galaxies with the Dragonfly Telephoto Array
Pieter van Dokkum (Yale University)
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2019-01-23
15:15
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Hunting abundance spreads in globular clusters of the LMC
Andreas Koch (ARI/ZAH)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
ARI seminar room basement, video broadcast to HITS, LSW, MPIA

2019-01-24
11:15
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The universality of the physics governing massive cluster formation across cosmic time
Diderik Kruijssen (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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Abstract
Globular clusters are the relics of extreme star formation in high-redshift galaxies. Their enormous potential as tracers of high-redshift galaxy formation is broadly recognised, but concrete applications of this link have remained out of reach. The key missing ingredient has been to construct an end-to-end model for star cluster formation and evolution in a cosmological context. I will review recent efforts towards formulating models for globular cluster formation and evolution during galaxy formation, showcasing the variety of techniques used, as well as their strengths and weaknesses. I will then present results from the E-MOSAICS project, in which we carry out fully self-consistent, cosmological zoom-in hydrodynamics simulations of the co-formation and evolution of globular clusters and their host galaxies. This work has led to two crucial insights. The first is that the formation of young massive clusters and old globular clusters can be described by a single modelling framework, showing that globular clusters are the relics of regular star formation in high-redshift environments. The second is that the high-pressure formation environment of globular clusters has shaped a wide range of their present-day properties, enabling their direct use as tracers of high-redshift galaxy growth. We demonstrate how globular cluster metallicities, masses, ages, kinematics, and spatial distributions provide a new and exciting window for reconstructing the host galaxy merger history, distinguishing between in-situ and ex-situ galaxy growth, and probing the conditions of cloud-scale star formation and feedback at high redshift. Specifically, I will demonstrate the power of unifying cluster formation and destruction processes across cosmic time by using the E-MOSAICS simulations to derive the formation and assembly history of the Milky Way, culminating in the reconstruction of its merger tree.

2019-01-25
15:00
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Yuan Wang (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2019-01-25
15:00
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Yuan Wang (MPIA)
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)
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2019-01-28
11:15
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Observing Large Scale Structures in the Gamma-Ray Sky
Pooja Surajbali (MPIK)
ITA "blackboard" Colloquium ( Hephysto link )
Philosophenweg, 12, 106
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Abstract
The High Altitude Water Cherenkov (HAWC) observatory in Mexico (4100 m .a.s.l.) has just finished its first year of data taking and produced some interesting results. Because of its wide field of view it is currently a unique detector to study extended sources (>2 degree) at energies above a few TeV. One of the largest structures in the gamma-ray sky are the so-called Fermi bubbles, extending to the North and South from the milky way centre. At energies around 1TeV, and above, the HAWC observatory is in a unique position to make observations (or constrain the flux) of the bubbles. From the results of HAWC, modelling of the bubbles with a focus on the energy range above 500 GeV and improving the HAWC event reconstruction, both energy accuracy and flux sensitivity are expected to improve.

2019-01-29
16:15
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Formation and properties of galactic discs: The N-body view
Lia Athanassoula (Laboratoire d’Astrophysique de Marseille (France))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2019-01-31
11:15
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Christoph Engler (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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2019-02-04
11:15
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A numerical study on the distribution of the satellite galaxies debris in the Milky Way environment
Matteo Mazzarini (ARI)
ITA "blackboard" Colloquium ( Hephysto link )
Philosophenweg, 12, 106

2019-02-05
16:15
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Molecular tori, black hole fueling and feedback in nearby AGN
Francoise Combes (Observatoire de Paris (France))
Heidelberg Joint Astronomical Colloquium ( Home pageHephysto link )
Philosophenweg 12, Großer Hörsaal

2019-02-06
15:15
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A review of the simulated Milky Ways in the IllustrisTNG simulations and a comparison to the Auriga and NIHAO simulations
Martina Donnari (MPIA Heidelberg)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
MPIA Heidelberg (Seminarraum 306), video broadcast to ARI, HITS, LSW

2019-02-06
16:00
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Nadine Neumayer (MPIA Heidelberg)
SFB Seminar - The Milky Way System ( Home pageHephysto link )
MPIA Heidelberg (Seminarraum 306), video broadcast to ARI, HITS, LSW

2019-02-07
11:15
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Lensing of '69 -- free gravitational lensing from its models
Jenny Wagner (ARI)
ARI Institute Kolloquium ( Hephysto link )
ARI Moenchhofstrasse 12-14, Seminarraum 1
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Abstract
Strong gravitational lenses can map an extended background source to several highly distorted and magnified images. Analysing the properties of those images yields important information about the distribution of the deflecting mass and the background source. Common approaches to reconstruct the source or the deflecting mass distribution model the global properties of the source and the lens. They obtain a consistent description of the entire configuration by refining the model until it matches the observation to a predefined precision. We develop a new approach to infer local properties of the gravitational lens and to reconstruct the source only using the properties of the multiple images without assuming a lens or a source model. In the talk, I will introduce the method and its applications in comparison to standard lens modelling methods. Since our leading principle to separate data-based information from model assumptions can also be applied to a broader range of research questions, I will conclude with an outlook how this ansatz can be transferred to other topics, based on my former experience searching for open star clusters in the HSOY catalogue.

2019-03-22
15:00
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Paola Di Matteo (GEPI/Obs. de Paris)
: Signature Speaker
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

2019-03-22
15:00
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Paola Di Matteo (GEPI/Obs. de Paris)
: Signature Speaker
Königstuhl Kolloquium ( Home pageHephysto link )
Max-Planck-Institut für Astronomie, Level 3 Lecture Hall (301)

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