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J/MNRAS/457/4160    BETA pilot multi-epoch continuum survey  (Heywood+, 2016)

Wide-field broad-band radio imaging with phased array feeds: a pilot multi-epoch continuum survey with ASKAP-BETA. Heywood I., Bannister K.W., Marvil J., Allison J.R., Ball L., Bell M.E., Bock D.-J., Brothers M., Bunton J.D., Chippendale A.P., Cooray F., Cornwell T.J., De Boer D., Edwards P., Gough R., Gupta N., Harvey-Smith L., Hay S., Hotan A.W., Indermuehle B., Jacka C., Jackson C.A., Johnston S., Kimball A.E., Koribalski B.S., Lenc E., Macleod A., McClure-Griffiths N., Mcconnell D., Mirtschin P., Murphy T., Neuhold S., Norris R.P., Pearce S., Popping A., Qiao R.Y., Reynolds J.E., Sadler E.M., Sault R.J., Schinckel A.E.T., Serra P., Shimwell T.W., Stevens J., Tuthill J., Tzioumis A., Voronkov M.A., Westmeier T., Whiting M.T. <Mon. Not. R. Astron. Soc., 457, 4160-4178 (2016)> =2016MNRAS.457.4160H (SIMBAD/NED BibCode)
ADC_Keywords: Interferometry ; Galaxies, radio ; Morphology Keywords: instrumentation: interferometers - techniques: interferometric - galaxies: general - radio continuum: galaxies Abstract: The Boolardy Engineering Test Array is a 6x12m dish interferometer and the prototype of the Australian Square Kilometre Array Pathfinder (ASKAP), equipped with the first generation of ASKAP's phased array feed (PAF) receivers. These facilitate rapid wide-area imaging via the deployment of simultaneous multiple beams within an ∼30deg2 field of view. By cycling the array through 12 interleaved pointing positions and using nine digitally formed beams, we effectively mimic a traditional 1hx108 pointing survey, covering ∼150deg2 over 711-1015MHz in 12h of observing time. Three such observations were executed over the course of a week. We verify the full bandwidth continuum imaging performance and stability of the system via self-consistency checks and comparisons to existing radio data. The combined three epoch image has arcminute resolution and a 1σ thermal noise level of 375µJy/beam, although the effective noise is a factor of ∼3 higher due to residual sidelobe confusion. From this we derive a catalogue of 3722 discrete radio components, using the 35 per cent fractional bandwidth to measure in-band spectral indices for 1037 of them. A search for transient events reveals one significantly variable source within the survey area. The survey covers approximately two-thirds of the Spitzer South Pole Telescope Deep Field. This pilot project demonstrates the viability and potential of using PAFs to rapidly and accurately survey the sky at radio wavelengths. Description: The target field was observed with BETA on three separate occasions as part of the commissioning and verification of the instrument. The telescope delivers 304MHz of instantaneous bandwidth and for these observations the sky frequency range was 711-1015MHz, corresponding to a fractional bandwidth of 35 per cent. The data are captured with a frequency resolution of 18.5kHz, using 16 416 frequency channels across the band. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 150 3722 Source catalog
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 20 A20 --- Name Name ( 22- 29 F8.4 deg RAdeg Right ascension (J2000) 31- 38 F8.4 deg DEdeg Declination (J2000) 40- 46 F7.4 arcsec e_RAdeg Right Ascension error (1 σ) 48- 54 F7.4 arcsec e_DEdeg Declination error (1 σ) 56- 62 F7.2 mJy Sint Integrated flux density of the component at 863MHz 64- 68 F5.2 mJy e_Sint Integrated flux density error 70- 76 F7.2 mJy/beam Speak Peak flux density of the component at 863MHz 78- 81 F4.2 mJy/beam e_Speak Peak flux density error 83- 86 F4.2 uJy/beam rms RMS local noise at the position of the component 88- 92 F5.2 --- alpha ?=- Spectral index (S∝να) 94 A1 --- l_maj Limit flag on maj for unresolved 95-100 F6.2 arcsec maj Deconvolved major axis 102-106 F5.2 arcsec e_maj ? Deconvolved major axis error 108 A1 --- l_min Limit flag on min for unresolved 109-114 F6.2 arcsec min Deconvolved minor axis 116-120 F5.2 arcsec e_min ? Deconvolved minor axis error 122 A1 --- l_PA Limit flag on PA for unresolved 123-128 F6.2 deg PA Deconvolved position angle 130-135 F6.2 deg e_PA ? Deconvolved position angle error 137-140 I4 --- IDg Zero-indexed unique identifier for the component (Gaussian component ID) 142-145 I4 --- IDs Zero-indexed unique identifier for the source (Source ID) 147-150 I4 --- IDi Zero-indexed unique identifier for the island (Island ID)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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