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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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Presentation on theme: "Gaseous galactic halos and the interstellar disk-halo connection Ralf-Jürgen Dettmar Astronomical Institute Ruhr-University Bochum."— Presentation transcript:

1 Gaseous galactic halos and the interstellar disk-halo connection Ralf-Jürgen Dettmar Astronomical Institute Ruhr-University Bochum

2 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 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

3 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Waddenmeer

4 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, (Tüllmann, Bomans, Elwert, Dettmar, Ferguson A&A 2003)

5 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, extraplanar HII regions in NGC55 (Tüllmann et al. 2003)

6 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, metal abundances of extraplanar HII regions are similar to the environment

7 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, today‘s paradigm… Reynolds Sci. American

8 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, „The“ Galactic chimney (DRAO)

9 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

10 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

11 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Ferrara & McLow

12 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Starburst M82 (Subaru Teleskop)

13 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, M82 by Chandra

14 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, gaseous galactic halos of diffuse ionized gas (DIG) are easily observable in H  NGC4700 (Rossa&Dettmar 2000)

15 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Larger sample of edge-on galaxies including objects with lower FIR luminosity

16 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Rossa & Dettmar (2003)

17 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, XMM

18 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

19 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

20 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

21 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

22 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Lisenfeld, Dahlem, Ehle Astro-ph/

23 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, NGC 5775 VLA C + D 6cm PI + B - vectors

24 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

25 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, DIG halo of NGC 5775 VLT / FORS1 slit positions

26 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, NGC 5775 rotation drops to systemic

27 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, balancing the gas motion at high galactic latitudes: Benjamin 1999

28 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, differential velocities in z important for dynamo models: B   z dv/dz

29 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

30 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Line ratios require additional heating in excess of photoionization

31 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, WHAM Milky Way Nearby Galaxy NGC55 Reynolds et al Bomans, Tüllmann, Dettmar, Ferguson

32 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Wisconsin H  Mapper WHAM (Reynolds, Haffner, Tuffte,...) T is raising with z : additional heating!

33 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6,

34 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, Elwert & RJD, ApJ in press

35 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 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

36 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, The End Supported by DFG and DLR


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