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 30 min prior  to the beginning of the talk.


August 2014

1.8.14 (Friday)
12:00
"Evolution of Science Operations at ESAC"
Bruno ALTIERI (ESO)
Abstract
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"Evolution of Science Operations at ESAC"

Bruno ALTIERI (ESO)

Abstract

Science operations of ESA astronomy missions started at ESAC in 1978 with the International Ultraviolet Explorer (IUE) . Planetary and solar system missions science operations are also run since more than a decade. From mission planning to Science Data archiving, 25 missions are involved. However the nature and the scope science operations is evolving, and I will show this more particularly with two key ESA mission: the Herschel Space Observatory (2009-2013) which explored the far-infrared and Euclid - to be launched in 2020 - with the aim of constraining the properties of dark matter and dark energy, by surveying 15000 square degrees of the extragalactic sky. ESA-provided elements are usually “embedded” in a larger cooperation with multiple Member State entities on Science Ground Segment. I will address the approaches used to design the structure of the ground segments and the responsibilities of the different sub-entities.
8.8.14 (Friday)
12:00
"The B fields in OB stars (BOB) survey"
Swetlana HUBRIG (AIP, Germany)
Abstract
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"The B fields in OB stars (BOB) survey"

Swetlana HUBRIG (AIP, Germany)

Abstract

Within the B fields in OB stars (BOB) survey, we search for magnetic fields in a sample of OB stars, making use of FORS2 and HARPS. We investigate the frequency of magnetic fields and the distribution of their strengths, ultimately to determine their origin. So far, about 100 objects were observed. Compared to previous surveys, our sample contains mostly slow rotators, providing important clues about the origin of magnetic fields in massive stars.
12.8.14 (Tuesday)
12:00
"The intergalactic medium in the cosmic web"
Nicolas TEJOS (University of California,Santa Cruz)
Abstract
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"The intergalactic medium in the cosmic web"

Nicolas TEJOS (University of California,Santa Cruz)

Abstract

I will present observational results on the properties of the intergalactic medium (IGM) in different environments of the cosmic web. I use proprietary and public data from HST/COS UV spectroscopy of background QSOs to observe the IGM in absorption at z<0.5. By cross-matching the position of individual HI absorption line systems to those of different large scale structures (LSS) traced by galaxy distributions (e.g. voids, filaments, clusters), I characterize the IGM in different cosmic environments. I will present results on the properties of the IGM within and around galaxy voids at z<0.1, that trace low- and mean-density environments respectively. I will also present results on high-density environments, using HST/COS data for a carefully selected QSO sightline that intersects multiple cosmological filaments, traced by galaxy cluster pairs, at z<0.5. With these datasets, we can directly test the modern paradigm for the cosmic web developed from cosmological simulations of structure formation.
26.8.14 (Tuesday)
12:00
"Atomic Data Calculations at Queen's University Belfast"
Kanti M. AGGARWAL (Queen's University Belfast)
Abstract
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"Atomic Data Calculations at Queen's University Belfast"

Kanti M. AGGARWAL (Queen's University Belfast)

Abstract

In this seminar atomic data (namely energy levels, radiative rates, life-times, electron impact excitation collision strengths, and rate coefficients) will be discussed for a variety of ions, which have applications in modelling and diagnostics of solar and other astrophysical plasmas. These results are theoretical from the fully relativistic GRASP (General purpose Relativistic Atomic Structure Package) and DARC (Dirac Atomic R-matrix Code) programs. The difficulties of performing large calculations, and importance of including relativistic effects and resonances in the determination of excitation rates will be highlighted. Comparisons will be shown and discrepancies with other available data will be discussed. Results will specifically be presented from our recent calculations on Al X, Si II and Fe XIV. The difficulties of assessing the accuracy of atomic data will also be emphasized.

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