Monday Seminar 2012
The IMPRS weekly seminar takes place every Monday at 13:00 in the seminar room 0.01. The feedback sheet can be downloaded here. For technical support call: Sabrina Taze at (tel: 0228 525 - 115). For the vcs system ask: Michael Marks (Tel: 0228 733653) or Jiannis Antoniadis (tel: 0228 525 - 314). The IP address to reach Koeln is: 134.95.46.173 The schedules for other years are found here: 2010, 2011, 2012, 2013
2-Jan-2012
9-Jan-2012	Zahra Sheikbahaee (2) Three dimensional Weak Gravitational Lensing Study from COMBO17 Survey Chair: E. Angelakis Abstract:   I will present the preliminary results of our weak lensing analysis of a field of two super clusters from the Wide Field Imager at the MPG/ESO 2.2-m telescope at La Silla, Chile. Our goal is to acquire information regarding the underlying matter distribution along the line of sight extending up to redshifts $z\sim0.3$. One important requirement of the analysis is an accurate determination of the photometric redshifts for the galaxy samples. Decreasing the redshift uncertainty improves the pinning the structures down in the radial direction. We exploit the photometry information from seventeen bands to obtain a more adequate measurement of the photometric redshift. The spurious effects of noise in the weak lensing data is reduced in our analysis by making presumption in our analysis about the structures along the line of sight. We apply a three dimensional discrete halo model which postulates all masses were encapsulated inside a set of haloes. This method computes the Bayesian evidence of the number of haloes needed to describe the three dimensional matter density field.
16-Jan-2012	Sameera Salim (2) SED Fitting analysis of (sub)millimeter galaxies in the COSMOS-LABOCA survey data Chair: Zahra Sheikbahaee Abstract: Submillimeter galaxies are dust obscured starburst gaaxies at high redshift and are thought to be the main contributors to the cosmic star formation rate density at these redshifts. Since the available single dish telescopes have a poor resolution,its comparatively difficult to identify counterparts precisely at other wavelengths and to take up subsequent analysis of their physics. In my talk I will concentrate on the various methods to pinpoint counterparts especially the new method we are testing-SED fitting technique, of our recently finished LABOCA 0.87mm COSMOS field survey data.
23-Jan-2012	Fujun Du (3) Production of interstellar hydrogen peroxide (H2O2) by grain chemistry Chair: Sameera Salim Abstract: I will first give a short introduction to astrochemistry, and then describe my work on modeling the formation of hydrogen peroxide (H2O2) in grain chemistry, which was recently first detected in the interstellar medium towards rho Ophiuchus A.
30-Jan-2012	Monthly Discussion +
6-Feb-2012	Guang-Xing Li (2) Molecular Outflow as an Entrainment Phenomenon Chair: Fujun Du Abstract: We propose a wind-driven turbulent model for outflow from protostars. We consider the interaction between the wind from the central protostar and the turbulent envelope, and the outflow is the turbulent entrainment layer that is developed between the wind and the envelope. The turbulence of the interstellar medium plays important role in our model by shaping the outflow cavity and by aiding the mass-growth of the outflow. Our model show promising morphology and kinematic structure. It can explain the de-collimation of outflow with time and is physically consistent in the sense that the dynamical effect of supersonic turbulence, which have been neglected in the wind-driven shell model, is taken into account. Further observational tests are discussed.
13-Feb-2012	Fangchun Liu (3) Title is Water deuterium fractionation in the high-mass hot core G34.26+0.15 Chair: Guang-Xing Li Abstract: Water is the main component of the ice mantles of dust grains and thus becomes a unique probe of the warm gas in star-forming cores, where ices evaporate. However, it is almost impossible to observe it from the ground. By measuring the distribution of the deuterium fractionation of water (HDO/H2O), we could trace the distribution and distinguish between the different pathways: grain surface chemistry or high temperature gas chemistry (HDO/H2O is expected to be low for hot chemistry). In this talk, I will present our HDO study towards the high-mass hot core G34.26+0.15. We used the 1-D radiative transfer code RATRAN with two different physical profiles to analyzed five HDO transitions observed with the APEX and SMA.
20-Feb-2012	Rosenmontag
27-Feb-2012	Monthly Disussion + Maryam Habibi (1)
5-Mar-2012	Natasa Tsitali (2)
12-Mar-2012	Lisa Zimmermann (2)
19-Mar-2012	Sandra Burkutean (2)
26-Mar-2012	Monthly Disussion + Rebekka Schmidt (2)
2-Apr-2012	Ewan Barr (3)
9-Apr-2012	Ostermontag
16-Apr-2012	Zeinab Shafiee (2)
23-Apr-2012	Nicolas Caballero (1)
30-Apr-2012	Monthly Disussion + Patrick Lazarus (1)
7-May-2012	Lijing Shao(1) - Guest-
14-May-2012	Banafsheh Shahzamanian (1)
21-May-2012	Monthly Disussion + Christian Fromm (3)
28-May-2012	Pfingsmontag
4-Jun-2012	Cherry Ng (2)
11-Jun-2012
18-Jun-2012
25-Jun-2012	Monthly Disussion +
2-Jul-2012	Florent Mertens (1)
9-Jul-2012	Aarti Nagarajan (3)
16-Jul-2012	L. Flöer (2)
23-Jul-2012	M. Broockamp (2)
30-Jul-2012	Monthly Disussion +
6-Aug-2012
13-Aug-2012
20-Aug-2012
27-Aug-2012	Monthly Disussion +
3-Sep-2012	I. Antoniadis (3)
10-Sep-2012
17-Sep-2012	M. Tomassetti (2)
24-Sep-2012	Monthly Disussion + M. Vitale (2)
1-Oct-2012
8-Oct-2012
15-Oct-2012	Jan Wagner (2)
22-Oct-2012
29-Oct-2012	Monthly Disussion + H. Saghiha (2)
5-Nov-2012	Sandra Burkutean (3)
12-Nov-2012
19-Nov-2012
26-Nov-2012	Monthly Disussion + Silvia Spezzano (3)
3-Dec-2012	Zahra Sheikbahaee (3)
10-Dec-2012	Jana Koehler (2)
17-Dec-2012
24-Dec-2012	Heiligabend
31-Dec-2012