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

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
Dust emission is a sensitive probe of the ISM in galaxies. Previous surveys have found galaxies were significantly dustier at earlier times, but the cause of this evolution, and the origin of the dust, are hotly debated topics in astrophysics. Using panchromatic data from the UV to the submillimetre, I will explore the physical properties and SEDs of a sample of ~250μm rest-frame selected submillimetre galaxies (SMGs). I then compare the SMGs to dusty galaxies at low redshift selected from one of the largest extragalactic Herschel surveys, H-ATLAS. From SED analysis it is found that a large fraction of the dust luminosity in SMGs originates from star-forming regions, whereas at lower redshifts the dust luminosity is dominated by the diffuse ISM. At the same dust mass the SMGs are offset towards a higher star-formation rate compared to the low redshift H-ATLAS galaxies. This is not only due to the higher gas fraction in SMGs but also because they are undergoing a more efficient mode of star formation. I will also present the results of chemical evolution modelling to understand the origin of dust in SMGs. Even after accounting for dust produced by low mass stars and supernovae the deficit in the dust mass budget provides support to the hypothesis that higher supernova yields, and/or substantial grain growth in the interstellar medium are required in order for the predicted dust mass to match observations of SMGs.

August 2014

26.08.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"(topic t.b.a.)"
Mark McCaughrean (ESA)
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"(topic t.b.a.)"

Mark McCaughrean (ESA)

Abstract
(available soon)

September 2014

09.09.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"(topic t.b.a.)"
Johanna Malinen (University of Helsinki)
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"(topic t.b.a.)"

Johanna Malinen (University of Helsinki)

Abstract
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16.09.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"(topic t.b.a.)"
Miwa Goto (USM)
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"(topic t.b.a.)"

Miwa Goto (USM)

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23.09.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"(topic t.b.a.)"
Yasuo Doi (University of Tokyo)
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"(topic t.b.a.)"

Yasuo Doi (University of Tokyo)

Abstract
(available soon)
30.09.14 (Tuesday)
12:30, ESO auditorium "Telescopium", Lunch Talk
"Modelling Galaxies within state-of-the-art Cosmological Simulations"
Violeta Gonzalez-Perez (University of Durham)
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"Modelling Galaxies within state-of-the-art Cosmological Simulations"

Violeta Gonzalez-Perez (University of Durham)

Abstract
Galaxies are thought to form within haloes of dark matter, whose gravity allows the galaxies to exist. The formation and evolution of galaxies is affected by a multitude of other processes besides gravity and computational modelling is the only way we can attempt to understand all these processes. In this work we present a new development of the GALFORM semi-analytical model of galaxy formation and evolution, which exploits a Millennium Simulation-class N-body run performed with the Wilkinson Microwave Anisotropy Probe 7 cosmology. We use this new model to study the impact of the choice of stellar population synthesis (SPS) model on the predicted evolution of the galaxy luminosity function. Besides this model, we have generated a new GALFORM flavour constructed from merger trees derived from EAGLE, a hydrodynamical simulation. We compare results from both GALFORM and EAGLE.

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