Results with the ATCA 3mm Prototype System (July 2001)

HCO⁺ emission in the starburst galaxy NGC 253

The HCO⁺ (1-0) spectra displayed below have been obtained on July 11, 2001, with the one baseline (CA03-CA04: 30m) 3mm prototype system of the Australia Telescope Compact Array. Weather conditions were ok (patchy clouds) with system temperatures around 340-380 K for CA03 and 320-360 K for CA04.
The HCO⁺ (1-0) rest frequency is 89.188518 GHz.

• Calibrated HCO⁺ emission spectra of the starburst galaxy NGC253. The centre frequencies of the two IFs are 89.162 GHz and 89.072 GHz, each with a bandwidth of 128 MHz, divided into 64 channels (config ant234ac_128_64_2p-2f). The displayed spectra are Hanning smoothed (hann=3). Please note the overlap region in the velocity range 250-300 km/s. The systemic velocity of NGC253 is 240 km/s. Bandpass and flux calibration was obtained by observing Uranus (7.3/7.2 Jy).
• Full HCO⁺ emission spectrum of the starburst galaxy NGC253, obtained with the miriad program "uvglue". The integration time on-source is 140 minutes.

See also