Wissenschaftliche Jahrestagung und Jahresversammlung der ÖGA2
Institut für Astrophysik,
Türkenschanzstr. 17, Wien
Freitag 13. April 2012
||Festakt anlässlich der Jubiläen von ESO (50 Jahre) und ÖGAA (10 Jahre):
- Begrüßung, Manuel Güdel (Präsident ÖGAA)
- Ansprache, Daniel Weselka (Bundesministerium für Wissenschaft und Forschung)
- "ESO - past and future", Bruno Leibundgut (ESO Director for Science)
- "ESO in Austria", Joao Alves (Vorstandsmitglied ÖGAA)
- anschließend Aperitif und Diskussion
||Gernot Grömer (Institut für Astro- und Teilchenphysik, Universität Innsbruck; Österreichisches Weltraum Forum):
PolAres - Simulating Planetary Exploration Activities
The Austrian Space Forum is leading an interdisciplinary research programme preparing exploration strategies for a human-robotic Mars expedition with a focus on astrobiology. A spacesuit simulator and a rover are embedded in an operational setting including a Mission Support Center monitoring operations. After a series of field tests, we report on major milestones include a desert field mission in the Rio Tinto Mars analog site in Spain, subsurface field tests and a planned expedition simulation in the Northern Sahara in February 2013.
The research focus is on engineering developments and operational aspects of planetary exploration, as well as studying the contamination vectors w.r.t. the search for extinct or extanct molecular life tracers on Mars, such as biologically precipitated minerals, non-stochastic homochiralities in organic molecules or other molecular biomarkers.
||Ute Möstl (IGAM, Institut für Physik, Universität Graz):
2.5D Numerical Simulations of the Kelvin-Helmholtz Instability - a Look at Venus (and the Sun)
The Kelvin-Helmholtz instability arises when layers of a stratified fluid or plasma have relative tangential velocities to each other. Such configurations occur at boundary layers in a variety of space plasmas - Earth's magnetopause, planetary and cometary boundaries, solar corona, astrophysical jets, etc.
Observations at Venus by the spacecraft Pioneer Venus Orbiter gave rise to speculations that the instability contributes to the loss of planetary ions through the formation of plasma clouds. We present 2.5D magnetohydrodynamic simulations of the Kelvin-Helmholtz instability at the boundary layer around Venus and discuss the resulting implications for the loss of planetary ions.
Just recently, the Solar Dynamic Observatory observed for the first time Kelvin-Helmholtz vortices at the boundary of a coronal mass ejection. We will give a brief overview of the occurrence of the instability at the Sun and of preliminary simulations.
||Thomas Posch (Institut für Astrophysik, Universität Wien):
Monitoring night sky brightness at Vienna, Mt. Mitterschöpfl and Berlin-Babelsberg
We present results of an ongoing campaign monitoring the night sky brightness at the observatories of Vienna, Mount Mitterschöpfl and Berlin-Babelsberg (AIP Potsdam). The photometric information obtained during the past months is complemented by spectroscopy of the night sky in the optical range, using an 80cm telescope.
||Yang Su (IGAM, Institut für Physik, Universität Graz):
Recent Results of Our Flare Studies
We will report recent progress in our studies of solar flares. Based on RHESSI, SDO/AIA and STEREO observations, we found evidence for magnetic reconnection. A method was developed to use RHESSI X-ray data to derive physical parameters (density and ionization distribution) of hot plasma in flaring loop. We will also report the discovery of solar magnetized tornadoes briefly.
||Helmut Dannerbauer (Institut für Astrophysik, Universität Wien):
Revealing Dusty Starbursts around Large Scale Structures at z=2
The Search for massive, dusty starbursts offers the great opportunity to trace galaxy overdensities and thus the cosmic web in the distant universe. We observed with APEX-LABOCA at 870 micron the fields of two large scale structures at z=2: the proto-cluster around the well-studied High-z Radio Galaxy MRC1138-262 at z=2.16 and the most distant X-ray luminous galaxy cluster CL J1449+0856 at z=2.07 known to date. In both fields we have discovered a large number of submm galaxies. Our LABOCA observations are complemented by exquisite multi-wavelength coverage of these structures (including VLA, Herschel, Spitzer, HST, VLT) thus allowing us the secure identification of a large fraction of the counterparts of the LABOCA sources and the proper description of their nature and properties. Our analysis suggests that indeed we are tracing the cosmic web in both fields. Finally, we will discuss prospects for ALMA studies of dusty starbursts in fields of galaxy (proto-)clusters at z=2.
||Robert Greimel (IGAM, Institut für Physik, Universität Graz):
The VPHAS ESO public survey
VPHAS, the VST Photometric Halpha Survey, is an ESO public survey of the southern Milky Way and the galactic bulge Observations for the survey started in January 2012. The survey goals, VST data reduction challenges and the current survey status are presented.
Arnold Hanslmeier (IGAM, Institut für Physik, Universität Graz)
Kosmische Katastrophen - Weltuntergänge aus der Sicht der Wissenschaft
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