4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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FROM CLOUDS TO DENSE CORES (II)

Place

Location: Hans Harnack Haus
Address: Ihnestr. 16-20, 14195 Berlin, http://www.harnackhaus-berlin.mpg.de/
Date: 5 Oct 14:00 - 17:45

Description

molecular cloud chemistry; laboratory experiments I. Ions, radicals

Timetable | Contribution List

Displaying 10 contributions out of 10
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
The W33 complex is an ideal object to study high-mass star formation since it contains molecular clouds in different evolutionary stages within a small area on the sky. The molecular clouds in W33 are located at similar distances (~2.4 kpc) and probably contained the same birth material. Thus, a comparative chemical study of these clouds along an evolutionary sequence (from quiescent dark clouds ... More
Presented by Dr. Katharina IMMER on 5/10/2015 at 15:15
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
The simplest amino acid glycine (NH$_2$CH$_2$COOH: d$_0$-Gly) is an achiral amino acid. However, if one of the carbon-bound hydrogen is replaced with a deuterium atom, it becomes a chiral molecule (NH$_2$CHDCOOH: d$_1$-Gly). Although there have been no reports on the detection of chiral species in space, chiral glycine has a potential to be one of the primordial chiral molecules in space. We then ... More
Presented by Dr. Yasuhiro OBA on 5/10/2015 at 14:45
Type: Review talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
A large fraction of molecules have been observed in cold dark sources. These astronomical objects represent the starting point for the formation of molecules that will participate in the chemistry of the birth of stars and planets. They are also supposed to be the most simple objects in term of physical conditions and history. In this review talk, we will present a summary of the recent model deve ... More
Presented by Dr. Valentine WAKELAM on 5/10/2015 at 12:00
Type: Invited Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
Relatively complex organic molecules (COMs), such as formamide or cyanomethanimine, have been detected in the gas-phase of various regions of the interstellar medium. Some difficulties in assessing their formation routes under the harsh conditions of interstellar objects have progressively brought the current astrochemical models to privilege grain-surface over gas-phase chemistry to explain their ... More
Presented by Prof. Nadia BALUCANI on 5/10/2015 at 14:20
Type: Invited Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
Molecular ions are important constituents of the interstellar medium. They are major drivers of the chemistry particularly in cold and dense molecular clouds, which are sites of star formation, and are tracers of the physical and chemical conditions in these environments. Their identification in space relies on accurately known transition frequencies provided by laboratory spectroscopy. Convention ... More
Presented by Dr. Sandra BRÜNKEN on 5/10/2015 at 12:25
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
The SILCC project (SImulating the Life-Cycle of molecular Clouds, Walch et al. arXiv:1412.2749; http://hera.ph1.uni-koeln.de/~silcc/) aims at a more self-consistent understanding of the interstellar medium on small scales and its link to galaxy evolution. We simulate the evolution of the multi-phase ISM in a 500 pc x 500 pc x 10 kpc region of a galactic disc, with a gas surface density of $\Sigma_ ... More
Presented by Dr. Thomas PETERS on 5/10/2015 at 15:30
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
We report on a new gas-grain chemistry model (Sipilä et al. 2015b) that contains multiply deuterated species and separates out the different nuclear spin isomers of molecules with several H and/or D nuclei. The nuclear spin branching ratios are calculated using symmetry rules under the assumption of complete scrambling. The method has been previously used for systems consisting of five H and/or D ... More
Presented by Dr. Olli SIPILÄ on 5/10/2015 at 12:50
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
Observations of star-forming sites rely heavily on the use of molecular tracers. However, the abundance of these tracers is not constant: it is a result of a complex network of chemical reactions, and it depends on the age, density, and dynamical history of the star-forming site. This chemical lens can introduce distortions in our observational understanding of star formation. In this talk, I w ... More
Presented by Prof. Konstantinos TASSIS on 5/10/2015 at 15:00
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
Initial conditions are crucial to understanding the formation of massive stars, which is still a mystery. One of the most debated points is whether massive star formation is a fast or slow process. Tan et al. (2013, ApJ, 779, 96, hereafter T13) discovered two massive starless cores C1-N and C1-S with ALMA. Their study suggests $\sim$mG magnetic field be present if the cores are virialized. ... More
Presented by Shuo KONG on 5/10/2015 at 13:05
Type: Contributed Talk Session: FROM CLOUDS TO DENSE CORES (II)
Track: FROM CLOUDS TO DENSE CORES 2
Dense gas in galactic nuclei is known to feed central starbursts and AGN, but the properties of this gas are poorly known due to the high obscuration by dust. Water and H2O+ are useful to trace the oxygen chemistry of interstellar gas, and its ionization rate. We present Herschel/HIFI spectra of the H2O 1113 GHz and H2O+ 1115 GHz lines toward 5 nearby prototypical starburst/AGN systems. The beam ... More
Presented by Prof. Floris VAN DER TAK
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