ASKAP Continuum Surveys of Local Galaxies Michael Brown ARC Future Fellow Monash University

Where are we now? NVSS / FIRST / SUMMS 0.5 mJy RMS per beam 15”-1’ beam ~30 uJy RMS per beam in 12 hours Future ASKAP 12

K<9 Spiral Galaxies Catalogued sources Flux density per beam from NVSS images

K<9 Early-type Galaxies Brown et al. 2011

K<10.5 Spiral Galaxies & AGNs Floyd et al. (submitted)

Radio continuum Continuum detects “hot mode” AGNS. Continuum can be a good SFR indicator – Have we been misled by optical colours? – Are SFR indicators properly calibrated? ASKAP ADE-12 is great for low z science! – It will detect all* local galaxies (duty cycles, env). – One galaxy per beam and with known locations. – Spectroscopy, morphology, optical, mid-IR Done better with completed ASKAP but…

Galaxy Colour Bimodality

Galaxy Evolution

Bonne et al. (in prep.) K-band Absolute Magnitude Red Spiral / Total Spiral

Kennicutt et al Corrected L H  L 1.4 L 1.4 & L H  SFR Indicator

Rescaling Spectra Spectra and H- alpha measurements from Moustakas et al. (2006, 2010) need to be increased by 10%.

UGCA 219 NVSS 4.5 mJy Optical g=14.78

UGCA 166 g~16 NVSS 2.0 mJy Optical g=16.05

Dolley et al. (in prep.) High star-formation Low star-formation Galaxy Clustering Strength Projected spatial Scale

Are Red Spirals Forming Stars? K AB <10.5 spiral galaxies – Bonne et al. (in prep) and Floyd et al. (sub.) NVSS 1.4 GHz as a star formation proxy – 1.4 GHz is not impacted by dust obscuration WISE mid-IR to search for warm dust – Dust is heated by star formation 21-cm to search for neutral hydrogen – Could star formation resume?

Sample Selection K AB <10.5 T-type > -1 NVSS 1.4 GHz coverage 228 galaxies Select galaxies with f 1.4 < 2.5 mJy 42 galaxies

SDSS Optical Colours K AB <10.5 f 1.4 <2.5 mJy All other spiral galaxies

UV-optical similar to passive E H-alpha lost in the noise Spiral arms are blue in UV-optical IR excess Red and no NVSS, but Star Forming

Radio continuum Continuum detects “hot mode” AGNS. Continuum can be a good SFR indicator – Have we been misled by optical colours? – Are SFR indicators properly calibrated? ASKAP ADE-12 is great for low z science! – It will detect all* local galaxies (duty cycles, env). – One galaxy per beam and with known locations. – Spectroscopy, morphology, optical, mid-IR Done better with completed ASKAP but…

NGC 2811 f 1.4 < 2.5 mJy X

Summary Have we been misled by colour bimodality? Red spirals are not faded blue spirals. – Red spirals are brighter than blue spirals (Bonne). High and low SFR spirals live in similar halos – The large-scale clustering is similar (Dolley). Low SFR spirals are not passive spirals – Infrared excess and PAH emission Red spirals generally have HI

NVSS WISE 11 microns Spitzer 24 microns SDSS Optical

Infrared SEDs IR excess relative to passive elliptical galaxies NGC 4725 spectrum shows PAH and dust emission

21-cm Catalogued HI in red Uncatalogued HI in black 228 spirals with K AB < spirals in HI catalogues 42 spirals f 1.4 < 2.5 mJy 31 spirals in HI catalogues

NGC 5188 f 1.4 =95 mJy X

NGC 7727 f 1.4 <2.5 mJy X