gaseous galactic halos and the interstellar disk-halo connection ralf-jürgen dettmar astronomical...
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Gaseous galactic halos and the interstellar disk-halo connection
Ralf-Jürgen Dettmar
Astronomical Institute
Ruhr-University Bochum
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Gaseous galactic halos
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collaborators in this field are:
J. Rossa / STScI
R. Tüllmann & V. Heesen/ RUB
T. Elwert / Kentucky
M. Urbanik & M. Soida/ Krakov
A. Ferguson/ROE
D. Breitschwerdt/ Vienna
W. Pietsch/MPE
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Waddenmeer
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(Tüllmann, Bomans, Elwert, Dettmar, Ferguson A&A 2003)
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extraplanar HII regions in NGC55 (Tüllmann et al. 2003)
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metal abundances of extraplanar HII regions are similar to theenvironment
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today‘s paradigm…
Reynolds Sci. American
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„The“ Galactic chimney (DRAO)
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Ferrara & McLow
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Starburst M82(Subaru Teleskop)
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M82 by
Chandra
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gaseous galactic halos of diffuse ionized gas (DIG) are easily observable in H
NGC4700 (Rossa&Dettmar 2000)
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Larger sample of edge-on galaxies including objects with lower FIR luminosity
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Rossa & Dettmar (2003)
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XMM
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Lisenfeld, Dahlem, Ehle
Astro-ph/0310458
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NGC 5775 VLA C + D 6cm PI + B - vectors
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NGC 5775rotation drops tosystemic
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Line ratios require additional heating in excess of photoionization
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WHAM Milky Way Nearby Galaxy NGC55
Reynolds et al
Bomans, Tüllmann, Dettmar, Ferguson
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Wisconsin H Mapper WHAM (Reynolds, Haffner, Tuffte, ...)
T is raising with z :
additional heating!
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Elwert & RJD, ApJ in press
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Summary:
the presence of gas in halos is correlated with the star formation in the underlying disk
halo DIG is a good tracer and correlates with X-ray gas, radio-synchrotron emission, and the presence of dust at high latitudes
there is low level star formation in halos
emission line ratios of the DIG are explained by photoionization + a 10% contribution of extra heating
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The End
Supported by DFG and DLR