A Search for Emission from Ionized Gas on the Outskirts of M31, M33, and the Milky Way Greg Madsen, Joss Bland-Hawthorn (AAO), Matt Haffner, Ron Reynolds.

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Presentation transcript:

A Search for Emission from Ionized Gas on the Outskirts of M31, M33, and the Milky Way Greg Madsen, Joss Bland-Hawthorn (AAO), Matt Haffner, Ron Reynolds (UW) faint, diffuse Ha emission from HVCs; probe of UV radiation requires high sensitivity + spectral resolution Ha Map of Complex A: distribution, kinematics, ionizing flux

Davies’ Cloud (Davies 1975, de Heij et al 2002) ≈ 2º away from M31, may be tidal moving at ≈ -200 km/s wrt M31 Wright’s Cloud (Wright 1979) few degrees from M33, offset by ≈ -150 km/s large size, velocity gradients M31/M33 ‘bridge’ (Braun & Thilker 2004) filament at ≈ 3 x 1017 cm-2