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

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

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

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 hours observing time

The Magellanic Stream Peak intensity map Total 2618 pointings Integration time- 2 min/pointing Velocity resolution 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

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

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

Velocity Maps of the Observed Stream

Velocity Dispersion in the Interface Region

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