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ATCA 12mm System and SNRs
12mm systems currently installed on CA02, CA03 and CA04 Available frequency ranges 16.1- 18.9 GHz and 20.1- 22.5 GHz
(Requires module swap to change bands)

At conclusion of MNRF I :
· 12mm on all six CA antennas · Maximum baseline 6 km · 16.0 ­ 26.0 GHz

(May term 2003)


Measured System Temperature
Polarisations A and B on CA03 at zenith


Atmospheric antenna temperature and opacity
(for good conditions at Narrabri: clear, humidity 20%)

MIRIAD: opplt


Calibration
Phase:
· Potential calibration sources being investigated by Bob Sault et al.. · ~1800 sources with S
20

> 400 mJy .

· Most vary in flux density, some resolved on long baselines.

Amplitude:
· Few if any unresolved sources known · Most reliable calibration from planets, especially Mars and Uranus ­ MIRIAD tasks PLPLOT and PLBOOT


H20 Maser in VX Sgr
4 MHz bandwidth ­ 2.5 minutes integration


First 12mm Image
N157B SNR in LMC 22.6 GHz Arrays: 210m & 375m arrays Baselines (m): 31, 46, 107, 153, 245, 275 Synthesised beam: 7.6" в 5.6" Peak brightness: 51 mJy /beam

(Ravi Subrahmanyan, Dave McConnell & Jim Caswell - February 2000)


SNR 1987A: 3cm imaging at ATCA

(Manchester et al., PASA , 2001, in press)


ATCA 3cm image (2000.8) overlaid on HST [OIII] image


ATCA 12 mm Observations of SNR 1987A
October 26, 2001 - 12h observation 1.5D array ­ baselines 474m, 643m, 1117m Two frequencies ­ 16.960 GHz, 18.880 GHz

Bad phases after 8:30am. (Sunrise at 6am, thick fog till 8:30am)


Phases for 0541- 7332 (0.95 Jy) at 19 GHz on a 1.1km baseline

26 October, 2001


12mm visibilities ­ 0541 -7332

Baselines: 475, 643, 1117 m

Rms phase ~ 23 deg


SNR 1987A at 12 mm ­ First Detection

Slightly extended: 2.8 x 1.8 arcsec. Flux density: 17 GHz: 20 +/ - 1 mJy 19 GHz: 18 +/ - 1 mJy 6D observation 24 November, 2001 Max baseline 2.1 km - Weather bad! IAU Circular 7757, Nov 20, 2001


SNR 1987A Spectrum : 1.4 ­ 19 GHz

ATCA 1.4 ­ 8.6 GHz spectrum extrapolated to October 26, 2001