@article{87be8d62a4544a07b600cbebfb1acb5f,
title = "Low-frequency imaging of fields at high galactic latitude with the murchison widefield Array 32 element prototype",
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 50° diameter fields in the southern sky, covering a total of 2700 deg2, 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.",
keywords = "dark ages, first stars, instrumentation: interferometers, methods: data analysis, reionization, surveys",
author = "Williams, {Christopher L.} and Hewitt, {Jacqueline N.} and Levine, {Alan M.} and {De Oliveira-Costa}, Angelica and Bowman, {Judd D.} and Briggs, {Frank H.} and Gaensler, {B. M.} and Hernquist, {Lars L.} and Mitchell, {Daniel A.} and Morales, {Miguel F.} and Sethi, {Shiv K.} and Ravi Subrahmanyan and Sadler, {Elaine M.} and Wayne Arcus and Barnes, {David G.} and Gianni Bernardi and Bunton, {John D.} and Cappallo, {Roger C.} and Crosse, {Brian W.} and Corey, {Brian E.} and Avinash Deshpande and Ludi Desouza and David Emrich and Goeke, {Robert F.} and Greenhill, {Lincoln J.} and Hazelton, {Bryna J.} and David Herne and Kaplan, {David L.} and Kasper, {Justin C.} and Kincaid, {Barton B.} and Ronald Koenig and Eric Kratzenberg and Lonsdale, {Colin J.} and Lynch, {Mervyn J.} and McWhirter, {S. Russell} and Morgan, {Edward H.} and Divya Oberoi and Ord, {Stephen M.} and Joseph Pathikulangara and Thiagaraj Prabu and Remillard, {Ronald A.} and Rogers, {Alan E.E.} and Roshi, {D. Anish} and Salah, {Joseph E.} and Sault, {Robert J.} and Shankar, {N. Udaya} and Srivani, {K. S.} and Stevens, {Jamie B.} and Tingay, {Steven J.} and Wayth, {Randall B.} and Mark Waterson and Webster, {Rachel L.} and Whitney, {Alan R.} and Williams, {Andrew J.} and Wyithe, {J. Stuart B.}",
year = "2012",
month = aug,
day = "10",
doi = "10.1088/0004-637X/755/1/47",
language = "English",
volume = "755",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1",
}