Seminars and Colloquia at ESO/Santiago

For ESO and ESO-related Conferences and Workshops in Europe and Chile please check the main Conferences and Workshops page.


Broadcast of the ESO talks is available upon request.  If anyone is interested, kindly contact us via email
at least 60 min prior  to the beginning of the talk.


August 2015

4.08.15 (Tuesday)
14:00
"Insights to galaxy assembly from nuclear and globular clusters"
Iskren GEORGIEV (Max-Plank Institut für Astronomie, Germany)
Abstract
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"Insights to galaxy assembly from nuclear and globular clusters"

Iskren GEORGIEV (Max-Plank Institut für Astronomie, Germany)

Abstract

The formation of a star cluster (globular, nuclear) is typically associated with a rapid burst of star formation out of material with similar chemical composition. For this reason they are considered as time capsules for the most violent events during galaxy assembly. Finding more than one stellar population in these systems with a half-mass surface density of >1e3 M_sol/pc^2 (within typically 3pc or so), where stellar feedback is expected to be very efficient, suggests for an even more unexpected evolutionary path for them and their host galaxies. I will present observational evidences from various observing campaigns that allows us to trace back their formation and the assembly history of their host galaxy by using the sheer number of clusters, their structure, integrated age and metallicity distributions. The properties of one of the oddest compact stellar systems in a galaxy: the nuclear star clusters (some containing a massive black whole), are used to probe in situ and merging events in their and their host galaxy formation. Lastly, I will also outline our most recent ongoing observing projects that look into the most peculiar nuclear clusters with indications for the presence of a massive black hole.

12.08.15 (Wednesday)
12:00
"Probing the nearby universe with Massive Stars"
Miguel A. URBANEJA (Institute for Astro- and Particle Physics, University of Innsbruck)
Abstract
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"Probing the nearby universe with Massive Stars"

Miguel A. URBANEJA (Institute for Astro- and Particle Physics, University of Innsbruck)

Abstract

The quantitative spectroscopy of individual massive stars in galaxies provides, among other things, stellar chemical abundances, representing a more accurate constraint of the present-day metallicity of star forming galaxies than the widely used HII regions, which are significantly affected by systematic uncertainties not well understood. The combination of efficient multi-object spectrographs, sophisticated model atmosphere codes, and advanced analysis methods made individual massive stars in a significant volume of the local universe accessible to quantitative spectroscopy, including objects in galaxies well beyond the Local Group. In this talk, I will review how the field of “Extragalactic Stellar Astrophysics” has matured over the last 10 years, as well as present my particular view on the challenges and prospects for the future.


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