Description
Interstellar medium properties and high-energy processes
Dr
Katia Ferrière
(IRAP Toulouse)
28/06/2011 16:25
I will review the observational properties of interstellar magnetic fields
in the disk and halo of our Galaxy. These properties are inferred from
a variety of observational methods, primarily based on polarization
of starlight, polarization of dust infrared emission, Zeeman splitting,
Faraday rotation, and synchrotron emission. I will discuss each of these
methods in some detail and...
Dr
Philipp Mertsch
(Rudolf Peierls Centre for Theoretical Physics Oxford)
28/06/2011 17:00
Gamma-ray data from Fermi-LAT reveal a bi-lobular structure extending up to 50 degrees above and below the galactic centre, which presumably originated in some form of energy release there less than a few million years ago. It has been argued that the gamma-rays arise from hadronic interactions of high energy cosmic rays which are advected out by a strong wind, or from inverse-Compton...
Dr
Jérome Péty
(IRAM & Observatoire de Paris)
28/06/2011 17:20
Summarizing 20 years of efforts, we will quantify the CO luminosity and CO-H2 conversion factor applicable to diffuse but partially molecular ISM when H2 and CO are present but C+ is the dominant form of gas-phase carbon. To do this, we will discuss galactic lines of sight observed in HI, HCO+ and CO where CO emission is present but the intervening clouds are diffuse (locally Av ~ 1 mag) with...
115.
Non-thermal emission from molecular clouds in the Galactic centre: Illumination vs cosmic rays.
Dr
Régis Terrier
(APC Paris)
28/06/2011 18:15
The molecular clouds at the Galactic centre (GC), Sgr B2 among others,
emit strong Fe Kalpha photons as well as hard X-rays up to 100 keV. The
origin of this emission has been the subject of a controversy.
Irradiation by subrelativistic cosmic rays, electrons or protons, might
account for the observed spectra, but it can also be the result of the
illumination of the clouds by a past high...
