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J/ApJ/755/47 110-200MHz interferometer observations (Williams+, 2012)
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Beginning of ReadMe :J/ApJ/755/47 Murchison Widefield Array 110-200MHz observations (Williams+ 2012)
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Low-frequency imaging of fields at high Galactic latitude with the Murchison
Widefield Array 32 element prototype.
Williams C.L., Hewitt J.N., Levine A.M., de Oliveira-Costa A., Bowman J.D.,
Briggs F.H., Gaensler B.M., Hernquist L.L., Mitchell D.A., Morales M.F.,
Sethi S.K., Subrahmanyan R., Sadler E.M., Arcus W., Barnes D.G.,
Bernardi G., Bunton J.D., Cappallo R.C., Crosse B.W., Corey B.E.,
Deshpande A., deSouza L., Emrich D., Goeke R.F., Greenhill L.J.,
Hazelton B.J., Herne D., Kaplan D.L., Kasper J.C., Kincaid B.B., Koenig R.,
Kratzenberg E., Lonsdale C.J., Lynch M.J., McWhirter S.R., Morgan E.H.,
Oberoi D., Ord S.M., Pathikulangara J., Prabu T., Remillard R.A.,
Rogers A.E.E., Roshi D.A., Salah J.E., Sault R.J., Udaya Shankar N.,
Srivani K.S., Stevens J.B., Tingay S.J., Wayth R.B., Waterson M.,
Webster R.L., Whitney A.R., Williams A.J., Wyithe J.S.B.
<Astrophys. J., 755, 47 (2012)>
=2012ApJ...755...47W
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ADC_Keywords: Radio sources ; Interferometry ; Radio continuum ; Surveys
Keywords: dark ages, reionization, first stars;
instrumentation: interferometers; methods: data analysis; surveys
Abstract:
The Murchison Widefield Array (MWA) is a new low-frequency, wide
field-of-view radio interferometer under development at the Murchison
Radio-astronomy Observatory in Western Australia. We have used a 32
element MWA prototype interferometer (MWA-32T) to observe two 50deg
diameter fields in the southern sky, covering a total of 2700deg^2^,
in order to evaluate the performance of the MWA-32T, to develop
techniques for epoch of reionization experiments, and to make
measurements of astronomical foregrounds. We developed a calibration
and imaging pipeline for the MWA-32T, and used it to produce 15'
angular resolution maps of the two fields in the 110-200MHz band.
We perform a blind source extraction using these confusion-limited
images, and detect 655 sources at high significance with an additional
871 lower significance source candidates. We compare these sources
with existing low-frequency radio surveys in order to assess the
MWA-32T system performance, wide-field analysis algorithms, and
catalog quality. Our source catalog is found to agree well with
existing low-frequency surveys in these regions of the sky and with
statistical distributions of point sources derived from Northern
Hemisphere surveys; it represents one of the deepest surveys to date
of this sky field in the 110-200MHz band.
Description:
The MWA-32T was designed to cover a frequency range from 80MHz to
300MHz, with an instantaneous bandwidth of 30.72MHz at a spectral
resolution of 40kHz. Observations were conducted with the MWA-32T in
2010 March during a two-week campaign. Data were taken in three
30.72MHz sub-bands centered at 123.52MHz, 154.24MHz, and 184.96MHz in
order to give (nearly) continuous frequency coverage between 110MHz
and 200MHz. The observing time was divided between two fields. One
field was centered on the bright extragalactic source Hydra A at
(J2000)09:18:06-12:5:45 to facilitate calibration. The other covered
the EoR2 field, centered at (J2000)10:20:00-10:00:00.