Gaseous galactic halos and the interstellar disk-halo connection

Ralf-Jürgen Dettmar

Astronomical Institute

Ruhr-University Bochum

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

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

3

Waddenmeer

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

4

(Tüllmann, Bomans, Elwert, Dettmar, Ferguson A&A 2003)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

5

extraplanar HII regions in NGC55 (Tüllmann et al. 2003)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

6

metal abundances of extraplanar HII regions are similar to theenvironment

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

7

today‘s paradigm…

Reynolds Sci. American

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

8

„The“ Galactic chimney (DRAO)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

9

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

10

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

11

Ferrara & McLow

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

12

Starburst M82(Subaru Teleskop)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

13

M82 by

Chandra

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)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

15

Larger sample of edge-on galaxies including objects with lower FIR luminosity

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

16

Rossa & Dettmar (2003)

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

17

XMM

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

18

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

19

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

20

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

21

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

22

Lisenfeld, Dahlem, Ehle

Astro-ph/0310458

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

23

NGC 5775 VLA C + D 6cm PI + B - vectors

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

24

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

26

NGC 5775rotation drops tosystemic

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

30

Line ratios require additional heating in excess of photoionization

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

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!

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

33

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

34

Elwert & RJD, ApJ in press

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

Gaseous galactic halos

Ralf-Jürgen Dettmar Island Universes July 6, 2005

36

The End

Supported by DFG and DLR