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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, 2005 2 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, 2005 3 Waddenmeer

4 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 4 (Tüllmann, Bomans, Elwert, Dettmar, Ferguson A&A 2003)

5 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 5 extraplanar HII regions in NGC55 (Tüllmann et al. 2003)

6 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 6 metal abundances of extraplanar HII regions are similar to the environment

7 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 7 today‘s paradigm… Reynolds Sci. American

8 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 8 „The“ Galactic chimney (DRAO)

9 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 9

10 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 10

11 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 11 Ferrara & McLow

12 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 12 Starburst M82 (Subaru Teleskop)

13 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 13 M82 by Chandra

14 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 14 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, 2005 15 Larger sample of edge-on galaxies including objects with lower FIR luminosity

16 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 16 Rossa & Dettmar (2003)

17 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 17 XMM

18 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 18

19 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 19

20 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 20

21 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 21

22 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 22 Lisenfeld, Dahlem, Ehle Astro-ph/0310458

23 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 23 NGC 5775 VLA C + D 6cm PI + B - vectors

24 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 24

25 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 25 DIG halo of NGC 5775 VLT / FORS1 slit positions

26 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 26 NGC 5775 rotation drops to systemic

27 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 27 balancing the gas motion at high galactic latitudes: Benjamin 1999

28 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 28 differential velocities in z important for dynamo models: B   z dv/dz

29 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 29

30 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 30 Line ratios require additional heating in excess of photoionization

31 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 31 WHAM Milky Way Nearby Galaxy NGC55 Reynolds et al Bomans, Tüllmann, Dettmar, Ferguson

32 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 32 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, 2005 33

34 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 34 Elwert & RJD, ApJ in press

35 Gaseous galactic halos Ralf-Jürgen Dettmar Island Universes July 6, 2005 35 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, 2005 36 The End Supported by DFG and DLR

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