Millimetre Astronomy with the Australia Telescope

Max Voronkov

Software Scientist – ASKAP

12th June 2009

Australia Telescope at mm: ATCA and Mopra

• Good set of receivers: 12mm, 7mm and 3mm

• Mopra up to 117 GHz

• Broadband backends available!• Application for time via

http://opal.atnf.csiro.au• Proposal deadlines

• June 15 (summer time)

• December 15 (mm)

CABB - Present mm capabilities

More channels (16384) over each 2 GHz sub-band are technically feasible, but the timescale of implementation is uncertain at present

CABB - Zoom modes (example: 1 MHz zoom)

CABB - Zoom modes

• The width of a filter bank channel is the width of each zoom window• Coarse resolution of the wide sub-band = bandwidth of 1 zoom window

• Stitching is possible (seamless, if interleaved windows are used)

• Initially up to 4 zoom windows per each 2 GHz sub-band• Eventually up to 16 zooms per sub-band will be available

• Each 2 GHz sub-band (and all its zooms) can have different resolution

Resolution Velocity Resolution Velocity coverage

Wide Zoom 3mm 7mm 12mm 3mm 7mm 12mm

MHz kHz m/s km/s

1 0.5 1.6 3.8 7.1 3.1 7.5 14.3

4 2 6.3 15 29 12.6 30 57

16 8 25 60 114 51 120 229

64 32 101 240 457 202 480 914

NH3 (4,4) in G351.77-0.54 (pre-CABB)

• Work by Beuther, Walsh and Longmore

• Zero-order (contours) and first-order (colour scale) moment maps

• Clear indication of rotation, but no signs of flattening

• Rotating surrounding envelope, rather than a disc

• The major axis is roughly 10000 AU

Search for CH3CH2OCH3 (ethyl methyl ether)

• 7mm pre-CABB work by Jones, Cunningham et al.• Lines detected, but no correct brightness pattern with other transitions has been found. So identification may be incorrect.

Sgr B2-M

Sgr B2-N

Masers in G343.12-0.06 (MNRAS, 2006, 373, 411)

• Work by Voronkov, Brooks, Sobolev, Ellingsen, Ostrovskii, Caswell

CABB observations of NGC6334I at 3mm

Work by Brooks, Titmarsh, Voronkov, Urquhart done as part of the CABB science commissioning

3mm continuum (contours) and C34S (2-1) (grayscale)

Recombination lines in G19.61-0.23 at 7mm

H53

42951.47 MHz

CABB withoutzooms

Mopra - a complementary single dish

See Tui Britton’s poster on BHR71 for a science example

• Similar set of receivers (but can go up to 117 GHz)• Wide-band spectrometer (UNSW-MOPS) available

(for a few years by now) Available modes:• Broad-band mode continuous coverage of 8.3 GHz (0.25 MHz resolution = 0.8 km/s at 3mm) • Zoom mode16 windows, 137.5 MHz each (0.03 MHz resolution = 0.1 km/s at 3mm)

or

Summary

• ATCA and Mopra are very powerful Southern hemisphere instruments thanks to the new broadband capabilities

• CABB: two 2 GHz sub-bands within 8 GHz, optional zoom modes

• MOPS: either 8 GHz broad band or 16 zooms, 137.5 MHz each

• Tuning ranges are 16-27 GHz, 30-50 GHz and 83.5-106 GHz (76-117 GHz for Mopra)

• A number of large surveys are already under way or planned• There is a potential for collaboration, contact the relevant PI if

you’re interested.

• Mopra HOPS, all Galactic plane at 12mm (Andrew Walsh)

• Mopra MALT-90 at 3mm (Jim Jackson)

• Mopra MALT-7mm (Gary Fuller), ATCA-7mm (Andrew Walsh)

• ATCA follow-up of the MMB survey detections at 7mm (myself)

• Proposal deadline is only a few days away (June 15)!• This deadline is for the next Oz summer, but night time is usually

fine for 12mm and 7mm observations.

Contact UsPhone: 1300 363 400 or +61 3 9545 2176

Email: enquiries@csiro.au Web: www.csiro.au

Thank you

Australia Telescope National FacilityMax VoronkovSoftware Scientist (ASKAP)

Phone: 02 9372 4427Email: maxim.voronkov@csiro.auWeb: http://www.narrabri.atnf.csiro.au/~vor010

Thanks to the following people for their contribution to the content of this presentation:P.Edwards, K.Brooks, S.Longmore, P.Jones, A.Walsh, M.Cunningham, T.Britton, S.Ellingsen, J.Caswell, A.Titmarsh, D.Ferris, D.McConnell, W.Wilson, J.Chapman