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.


March 2015

17.03.15 (Tuesday)
12:00
"The Nature of Star Formation Quenching in Unlikely Sources"
Katherine ALATALO (IPAC)
Abstract
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"The Nature of Star Formation Quenching in Unlikely Sources"

Katherine ALATALO (IPAC)

Abstract

Feedback on the interstellar medium of galaxies by outflows driven by Active Galactic Nuclei is an essential component of many models of galaxy formation, but an example of an AGN outflow directly affecting the star formation (SF) efficiency in the resident molecular gas has not been observed. Here we present millimeter-wave observations from ALMA and CARMA of the gas and dust continuum of NGC 1266, which hosts an AGN-driven outflow, finding that SF is very suppressed in the nuclear region. The ratio of the SF rate surface density (ΣSFR) to the gas surface density (ΣH2) reveals that SF is suppressed by a factor of ≈ 70 in the molecular gas compared to normal star-forming galaxies. The AGN-driven outflow can account for this extreme suppression by injecting turbulence into the molecular gas, regulating SF while simultaneously hindering black hole growth, providing an example of regulation that can the M-σ relation at intermediate scales. Finding galaxies like NGC1266 has the potential to shed light on the nature of galaxy transformation, and I discuss the Shocked Poststarburst Galaxy (SPOGS) survey, designed to find these "needles in the haystack", which has discovered both some expected, as well as unexpected results.

18.03.15 (Wednesday)
15:30
"Environmental effects on galaxy properties"
Anna PASQUALI (Astronomisches Rechen-Institut, Zentrum fuer Astronomie der Universitaet Heidelberg & ESO Visiting Scientist)
Abstract
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"Environmental effects on galaxy properties"

Anna PASQUALI (Astronomisches Rechen-Institut, Zentrum fuer Astronomie der Universitaet Heidelberg & ESO Visiting Scientist)

Abstract

It is by now well established that galaxy evolution is driven by intrinsic and environmental processes, both contributing to shape the observed properties of galaxies. A number of early studies have shown that the star formation activity of galaxies depends on their local density, and, on the theoretical side, models of galaxy evolution have indicated that galaxies residing in the same environment do not evolve similarly. Contrary to their central (most massive) galaxy of a group/cluster, satellite galaxies are stripped off their gas and stars, and have their star formation quenched by their environment. Large galaxy surveys like SDSS now allow us to investigate in detail environment-driven transformation processes by comparing centrals and satellites. In this talk I will outline what we have so far learnt about environmental effects by analysing the observed properties of local central and satellite galaxies in SDSS, as a function of their stellar mass and the dark matter mass of their host group/cluster.

19.03.15 (Thursday)
12:00
"Studying young stellar clusters using the VVV survey"
Gustavo BAUME (FCAG (UNLP) - IALP (Conicet-UNLP) & ESO Visiting Scientist)
Abstract
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"Environmental effects on galaxy properties"

Gustavo BAUME (FCAG (UNLP) - IALP (Conicet-UNLP) & ESO Visiting Scientist)

Abstract

VVV is one of the near IR surveys operating on the VISTA telescope scanning the Milky Way bulge and an adjacent section of the disk, where star formation activity is high. We present some results concerning the search of new embedded clusters and the particular studies performed over several young clusters combining deep JHK VVV observations with infrared spectroscopy of selected stars, optical photometry and ISM radio data. The spectra and the deep wide–field VVV photometry enabled us to precisely and independently determine the characteristics of the clusters, On the other hand, ISM information allowed us to understand the connection between the clusters and their surrounding environment. Our study revealed the strength of the methodology employed to obtain reliable parameters for poorly characterized and/or newly discovered clusters. We also discuss the spiral structure of the Galaxy using optical and infrared clusters together with other typical arm tracers and a classical model.


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