Seminars and Colloquia at ESO Garching

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

July 2014

15.07.14 (Tuesday)
10:00, ESO room Tucana, Star and Planet Formation Seminar
"The dependence of star formation efficiency on gas density"
Andreas Burkert (LMU)
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"The dependence of star formation efficiency on gas density"

Andreas Burkert (LMU)

Abstract
Observations indicate that the efficiency of star formation is a strong function of gas density or gas surface density with the star formation efficiency approaching unity on the scales of molecular cloud cores. I will argue that these observations are very puzzling. They require that dense gas has to be replenished on timescales that are similar to local gravitational collapse and star formation timescale. Numerical simulations cannot reproduce these observations, indicating that some fundamental processes that regulate star formation are still very poorly understood.
15.07.14 (Tuesday)
12:30, ESO room 231/232, Lunch Talk
"X-shooter and SINFONI reveal powerful outflows in X-ray luminous obscured QSOs"
Marcella Brusa (University of Bologna)
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"X-shooter and SINFONI reveal powerful outflows in X-ray luminous obscured QSOs"

Marcella Brusa (University of Bologna)

Abstract
Quasar feedback on host galaxies in the form of powerful outflows is invoked as a key mechanism to quench star formation in massive galaxies, but direct observational evidences are still scarce and the debate on the physical origin of the observed outflows is still open. After reviewing the observational constraints we have so far on the existence and origin of this mechanism, I will present new X-shooter@VLT observations of a representative sample of 10 luminous, X-ray obscured QSOs at z~1.5 from the XMM-COSMOS survey, expected to be caught in the transitioning phase from starburst to AGN dominated systems. From the rest-frame optical spectra we could infer the presence of outflows in 6 out of 8 sources. This may be considered as a compelling indication that the color selection applied to our X-ray sample is effective in picking up objects in the outflowing phase. A comparison of the outflow energetic with the AGN luminosity and the kinetic energy associated to stellar processes, suggest that the AGN rather than the on-going star-formation may be the major driver for the presence of the observed broad and shifted components. In the two brightest sources we were also able to probe, via slit resolved spectroscopy, that the outflows extend up to 10 kpc scales. Most important, thanks to SINFONI data available for one of these 2 targets (XID2028) we were able to probe the presence of both negative and positive outflow-induced feedback in the host galaxy of the powerful QSO.
22.07.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"(topic t.b.a.)"
Nicola Da Rio (University of Florida)
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"(topic t.b.a.)"

Nicola Da Rio (University of Florida)

Abstract
(available soon)
29.07.14 (Tuesday)
12:30, ESO auditorium "Telescopium", Lunch Talk
"The dust budget crisis in high-redshift submillimetre galaxies"
Kate Rowlands (University of St. Andrews)
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"The dust budget crisis in high-redshift submillimetre galaxies"

Kate Rowlands (University of St. Andrews)

Abstract
(available soon)

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