The multi-phase gaseous halos of late-type spirals

Autor(en)

Ralph Tüllmann, Wolfgang Pietsch, Jörn Rossa, Dieter Breitschwerdt, Ralf Juergen Dettmar

Abstrakt

First results from an X-ray mini-survey carried out with XMM-Newton are presented in order to investigate the diffuse Hot Ionized Medium in the halos of nine starforming edge-on galaxies. Diffuse X-ray halos were detected in eight of our targets, covering a wide range of star formation rates from quiescent to starburst cases. EPIC X-ray contour maps overlaid onto Ha imaging data revealed that the presence of X-ray halos is correlated with Diffuse Ionized Gas. Moreover, these halos are associated with non-thermal cosmic ray halos, as evidenced by radio continuum observations. UV-data obtained with the OM-telescope reveal that Diffuse Ionized Gas is well associated with UV emission originating in the disk. We found very strong indications that spatially correlated multi-phase gaseous halos are associated with star forming processes in the disk. By including multi-wavelength data of other star forming spirals, we obtained a sample of 23 galaxies which allow us to test key parameters which trigger the formation of multi-phase halos. We found that diffuse soft (0.3-2.0 keV) X-ray luminosities correlate well with Ha, B-band, FIR, UV, and radio continuum luminosities, with SFRs and with the energy input rate by SNe. X-ray luminosities are found to not correlate with HI mass and baryonic mass. All this implies that gaseous halos are indeed created by star forming processes. Moreover, there seems to exist a critical SFR threshold above which these halos form.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Max-Planck-Institut für extraterrestrische Physik, Space Telescope Science Institute, Ruhr-Universität Bochum (RUB)

Band

2 vols.

Seiten

415-420

Anzahl der Seiten

6

Publikationsdatum

2006

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f76724b3-a37e-42af-8602-d7be8108cf0d