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

T. N. Reynolds, L. Staveley-Smith, J. Rhee, T. Westmeier, A. P. Chippendale, X. Deng, R. D. Ekers, M. Kramer

Research output: Contribution to journalArticle

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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 1 150 to 1 480 MHz and are used to show the ability of PAFs to suppress standing wave problems by a factor of ~10, which afflict normal feeds. We also compare our results with previous HIPASS observations and with previous H i images of the Large Magellanic Cloud. Drift scan observations of the GAMA G23 field resulted in direct H i 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 H i data of 1 094 individually undetected galaxies in the GAMA G23 field in the redshift range 0.05 ⩽ z ⩽ 0.075. Finally, we use the low standing wave ripple and wide bandwidth of the PAF to set a 3σ upper limit to any positronium recombination line emission from the Galactic Centre of <0.09 K, corresponding to a recombination rate of <3.0 × 1045 s−1.

LanguageEnglish
Article numbere051
JournalPublications of the Astronomical Society of Australia
Volume34
DOIs
StatePublished - 7 Nov 2017

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standing wave
phased arrays
recombination
line spectra
telescopes
ripple
standing waves
radio
galaxies
radio telescopes
positronium
Magellanic clouds
ripples
flux density
frequency ranges
bandwidth
detection
rate

Cite this

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title = "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 1 150 to 1 480 MHz and are used to show the ability of PAFs to suppress standing wave problems by a factor of ~10, which afflict normal feeds. We also compare our results with previous HIPASS observations and with previous H i images of the Large Magellanic Cloud. Drift scan observations of the GAMA G23 field resulted in direct H i 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 H i data of 1 094 individually undetected galaxies in the GAMA G23 field in the redshift range 0.05 ⩽ z ⩽ 0.075. Finally, we use the low standing wave ripple and wide bandwidth of the PAF to set a 3σ upper limit to any positronium recombination line emission from the Galactic Centre of <0.09 K, corresponding to a recombination rate of <3.0 × 1045 s−1.",
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author = "Reynolds, {T. N.} and L. Staveley-Smith and J. Rhee and T. Westmeier and Chippendale, {A. P.} and X. Deng and Ekers, {R. D.} and M. Kramer",
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Spectral-Line Observations Using a Phased Array Feed on the Parkes Telescope. / Reynolds, T. N.; Staveley-Smith, L.; Rhee, J.; Westmeier, T.; Chippendale, A. P.; Deng, X.; Ekers, R. D.; Kramer, M.

In: Publications of the Astronomical Society of Australia, Vol. 34, e051, 07.11.2017.

Research output: Contribution to journalArticle

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T1 - Spectral-Line Observations Using a Phased Array Feed on the Parkes Telescope

AU - Reynolds,T. N.

AU - Staveley-Smith,L.

AU - Rhee,J.

AU - Westmeier,T.

AU - Chippendale,A. P.

AU - Deng,X.

AU - Ekers,R. D.

AU - Kramer,M.

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