Spectral-line Observations Using a Phased Array Feed on the Parkes Telescope

Abstract

We present first results from pilot observations using a phased array feed (PAF) mounted on the Parkes 64-m radio telescope. The observations presented here cover a frequency range from 1150 to 1480 MHz and are used to show the ability of PAFs to suppress standing wave problems by a factor of $\sim 10$ which afflict normal feeds. We also compare our results with previous HIPASS observations and with previous HI images of the Large Magellanic Cloud. Drift scan observations of the GAMA G23 field resulted in direct HI detections at $z=0.0043$ and $z=0.0055$ of HIPASS galaxies J2242-30 and J2309-30. Our new measurements generally agree with archival data in spectral shape and flux density, with small differences being due to differing beam patterns. We also detect signal in the stacked HI data of 1094 individually undetected galaxies in the GAMA G23 field in the redshift range $0.05\le z\le 0.075$. Finally, we use the low standing wave ripple and wide bandwidth of the PAF to set a $3\sigma$ upper limit to any positronium recombination line emission from the Galactic Centre of $<0.09$ K, corresponding to a recombination rate of $<3.0\times 10^{45}{\mathrm{s}}^{-1}$.

14 pages, 13 figures, accepted for publication by PASA

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Cited by in corpus (8)

• Australian Square Kilometre Array Pathfinder: I. System Description
• WALLABY -- An SKA Pathfinder HI Survey
• An ultra-wide bandwidth (704 to 4032 MHz) receiver for the Parkes radio telescope
• An HI intensity mapping survey with a Phased Array Feed
• Commissioning the HI Observing Mode of the Beamformer for the Cryogenically Cooled Focal L-band Array for the GBT (FLAG)
• HiFAST: An HI Data Calibration and Imaging Pipeline for FAST III. Standing Wave Removal
• Astrophysical signatures of leptonium
• Characterising the Apertif primary beam response