1. High-Resolution Observations of the Magellanic Stream Deanna Matthews Dr Lister Staveley-Smith Professor Peter Dyson La Trobe University ATNF, CSIRO La Trobe University

2. The Magellanic System The Magellanic Stream (MS) The origin of the Magellanic Stream ATCA Pilot Survey of the MS Preliminary Results Future Work

3. Putman et al. 2003, ApJ, 586 The Magellanic System Leading Arm LMC SMC Magellanic Stream Magellanic Bridge

4. The ATCA Pilot Survey of the Magellanic Stream The H75 array of the ATCA was used to observe a 250 deg 2 region at the head of the Magellanic Stream July & August 2005 100 hours observing time

5. The Magellanic Stream Peak intensity map Total 2618 pointings Integration time- 2 min/pointing Velocity resolution- 1.649 km s -1 Angular Resolution- 7.4 x 6.2 arcmin 2 RMS sensitivity 0.1 K Fully image spatial scales from 0.1 to 2 kpc

7. Peak temperature maps of a filament from combined GASS+Brüns data (left) and ATCA+GASS+Brüns data (right)

8. The Magellanic Stream SMC, Interface Region and initial bifurcation of the Stream Velocity range 82-254 km s -1 Column density- Min- 4.23 x 10 19 cm -2 Max- 5.05 x 10 20 cm -2 Total HI Mass our region- M(HI) = 1.17 x 10 8 M sun [d/60 kpc] 2

11. Velocity Maps of the Observed Stream

12. Velocity Dispersion in the Interface Region

14. Future Work Much to be done! Results thus far are very promising! Spatial Power Spectrum (SPS) Extend velocity analysis, including velocity dispersion Search for HI shells and holes Statistically compare the cool and warm gas Investigate data from other wavelengths, particularly H , IR and UV