Williams, Christopher L. ; Hewitt, Jacqueline N. ; Levine, Alan M. ; de Oliveira-Costa, Angelica ; Bowman, Judd D. ; Briggs, Frank H. ; Gaensler, B. M. ; Hernquist, Lars L. ; Mitchell, Daniel A. ; Morales, Miguel F. ; Sethi, Shiv K. ; Subrahmanyan, Ravi ; Sadler, Elaine M. ; Arcus, Wayne ; Barnes, David G. ; Bernardi, Gianni ; Bunton, John D. ; Cappallo, Roger C. ; Crosse, Brian W. ; Corey, Brian E. ; Deshpande, Avinash ; deSouza, Ludi ; Emrich, David ; Goeke, Robert F. ; Greenhill, Lincoln J. ; Hazelton, Bryna J. ; Herne, David ; Kaplan, David L. ; Kasper, Justin C. ; Kincaid, Barton B. ; Koenig, Ronald ; Kratzenberg, Eric ; Lonsdale, Colin J. ; Lynch, Mervyn J. ; McWhirter, S. Russell ; Morgan, Edward H. ; Oberoi, Divya ; Ord, Stephen M. ; Pathikulangara, Joseph ; Prabu, Thiagaraj ; Remillard, Ronald A. ; Rogers, Alan E. E. ; Roshi, D. Anish ; Salah, Joseph E. ; Sault, Robert J. ; Shankar, N. Udaya ; Srivani, K. S. ; Stevens, Jamie B. ; Tingay, Steven J. ; Wayth, Randall B. ; Waterson, Mark ; Webster, Rachel L. ; Whitney, Alan R. ; Williams, Andrew J. ; Wyithe, J. Stuart B. (2012) Low-frequency imaging of fields at high galactic latitude with the Murchison Widefield Array 32 element prototype The Astrophysical Journal, 755 (1). Article ID 47-19 pages. ISSN 0004-637X
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Official URL: http://iopscience.iop.org/article/10.1088/0004-637...
Related URL: http://dx.doi.org/10.1088/0004-637X/755/1/47
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 110-200 MHz 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 110-200 MHz band.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Astronomical Society. |
| Keywords: | Dark Ages; Reionization; First Stars; Instrumentation: Interferometers; Methods: Data Analysis; Surveys |
| ID Code: | 114301 |
| Deposited On: | 21 May 2018 05:15 |
| Last Modified: | 21 May 2018 05:15 |
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