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.

September 2014

23.09.14 (Tuesday)
10:00, ESO room "Fornax", Star and Planet Formation seminar
"Galactic Cold Interstellar Filaments"
Ke Wang (ESO)
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"Galactic Cold Interstellar Filaments"

Ke Wang (ESO)

Abstract
The molecular ISM is known to be highly hierarchical and filamentary. Studies in recent years have demonstrated the importance of filaments in star formation, at scales of <10 pc and >100 pc, and suggest a new paradigm for star formation. However, extremely filamentary giant molecular clouds (GMCs) at scales between 10 and 100 pc have not been studied systematically. A compelling sample does not exist at the first place, due to a historical limitation in the identifying methodology (i.e., extinction).
We recently launched a dedicated project to bypass this limitation, using the full Hi-GAL images to directly search for large filaments in the entire Galactic plane. As a pilot study of the project, we select a sample of 9 most prominent filaments with a length of 30-103 pc and mass (2.4-19)x10^4 Msun. These filaments are cold compared to surroundings and show no significant internal heating. This makes our project unique in probing the early evolutionary phases to study the connection of filamentary GMCs to the onset of star formation. I will present preliminary analysis of the pilot sample.
23.09.14 (Tuesday)
12:30, ESO room "Fornax", Lunch Talk
"AKARI FIR All-Sky Maps"
Yasuo Doi (University of Tokyo)
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"AKARI FIR All-Sky Maps"

Yasuo Doi (University of Tokyo)

Abstract
We present the AKARI far-infred (FIR) all-sky maps and describe its characteristics, calibration accuracy and scientific capabilities. The AKARI FIR survey has covered 97% of the whole sky in four photometric bands, which cover continuously 50--180 micron with band central wavelengths of 65, 90, 140, and 160 microns. The spatial resolution of the maps is ~60--90 arcsecs and the detection limit is ~1--12 [MJy/sr] with an absolute accuracy of ~20%.

The data for the first time reveal the whole sky distribution of interstellar matter with arcminute-scale spatial resolutions at the peak of dust continuum emission, enabling us to investigate large-scale distribution of interstellar medium in great detail. The filamentary structure covering the whole sky is well traced by the all-sky maps.

The data are currently under assessment by the AKARI science team members and to be publicly released later this year. The release schedule is also described in this presentation.
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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