Millimetre Astronomy with the Australia Telescope

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Millimetre Astronomy with the Australia Telescope

• Max Voronkov
• Software Scientist ASKAP
• 12th June 2009

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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)

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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
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CABB - Zoom modes (example 1 MHz zoom)
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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

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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

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Search for CH3CH2OCH3 (ethyl methyl ether)
Sgr B2-M
Sgr B2-N

• 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.

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

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

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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)
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Recombination lines in G19.61-0.23 at 7mm
H53?
42951.47 MHz
CABB without zooms
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Mopra - a complementary single dish

• 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 mode
• 16 windows, 137.5 MHz each (0.03 MHz resolution
  0.1 km/s at 3mm)

or
See Tui Brittons poster on BHR71 for a science
example
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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 youre 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.

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Thank you
Australia Telescope National Facility Max
Voronkov Software Scientist (ASKAP) Phone 02
9372 4427 Email maxim.voronkov_at_csiro.au Web
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