Physical processes in the ISM

Session

The ISM in the extreme environment of galactic centers

24 Oct 2013, 16:45

MPE

Conveners

The ISM in the extreme environment of galactic centers

• Avishai Dekel

130. The ISM in the extreme environment of galactic centers

Steven Longmore (Liverpool John Moores University)

24/10/2013, 16:45

review talk

37. The ISM in the extreme environment of early-type galaxies

Timothy Davis (ESO)

24/10/2013, 17:25

contributed talk

The centres of early-type galaxies are extreme environments, with strong radiation fields from old stars, high metallicities, alpha-enhancements, deep potential wells, and a high incidence of AGN. It has been shown in recent years that despite these extreme conditions a sizeable proportion of these galaxies have a cold ISM, with atomic/molecular gas and dust reservoirs. We have carried out a...

137. Physical processes of gas ionization in the Galactic Center and the origin of 6.4 keV and absorption H_3^+ lines from there

Vladimir Dogiel (P.N.Lebedev Institute of Physics)

24/10/2013, 17:40

contributed talk

We investigate the origin of the diffuse 6.4~keV line emission and the source of H$_2$ ionization in the diffuse molecular gas of the Galactic center (GC) region. We showed that Fe atoms are most likely ionized by X-ray photons emitted by Sgr~A$^\ast$ during a previous period of flaring activity of the supermassive black hole.  The H$_2$ molecules of the diffuse gas can not be ionized by...