LOW-FREQUENCY IMAGING OF FIELDS AT HIGH GALACTIC LATITUDE WITH THE MURCHISON WIDEFIELD ARRAY 32 ELEMENT PROTOTYPE

被引：24

作者：

Williams, Christopher L. ^{[1
]}

Hewitt, Jacqueline N. ^{[1
]}

Levine, Alan M. ^{[1
]}

de Oliveira-Costa, Angelica ^{[2
]}

Bowman, Judd D. ^{[3
]}

Briggs, Frank H. ^{[4
,5
]}

Gaensler, B. M. ^{[5
,6
]}

Hernquist, Lars L. ^{[2
]}

Mitchell, Daniel A. ^{[5
,7
]}

Morales, Miguel F. ^{[8
]}

Sethi, Shiv K. ^{[9
]}

Subrahmanyan, Ravi ^{[5
,9
]}

Sadler, Elaine M. ^{[5
,6
]}

Arcus, Wayne ^{[10
]}

Barnes, David G. ^{[11
]}

Bernardi, Gianni ^{[2
]}

Bunton, John D. ^{[12
]}

Cappallo, Roger C. ^{[13
]}

Crosse, Brian W. ^{[10
]}

Corey, Brian E. ^{[13
]}

Deshpande, Avinash ^{[9
]}

deSouza, Ludi ^{[6
,12
]}

Emrich, David ^{[10
]}

Goeke, Robert F. ^{[1
]}

Greenhill, Lincoln J. ^{[2
]}

Hazelton, Bryna J. ^{[8
]}

Herne, David ^{[10
]}

Kaplan, David L. ^{[14
]}

Kasper, Justin C. ^{[2
]}

Kincaid, Barton B. ^{[13
]}

Koenig, Ronald ^{[12
]}

Kratzenberg, Eric ^{[13
]}

Lonsdale, Colin J. ^{[13
]}

Lynch, Mervyn J. ^{[10
]}

McWhirter, S. Russell ^{[13
]}

Morgan, Edward H. ^{[1
]}

Oberoi, Divya ^{[13
]}

Ord, Stephen M. ^{[10
]}

Pathikulangara, Joseph ^{[12
]}

Prabu, Thiagaraj ^{[9
]}

Remillard, Ronald A. ^{[1
]}

Rogers, Alan E. E. ^{[13
]}

Roshi, D. Anish ^{[15
]}

Salah, Joseph E. ^{[13
]}

Sault, Robert J. ^{[7
]}

Shankar, N. Udaya ^{[9
]}

Srivani, K. S. ^{[9
]}

Stevens, Jamie B. ^{[12
,16
]}

Tingay, Steven J. ^{[5
,10
]}

Wayth, Randall B. ^{[5
,10
]}

机构：

[1] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA

[4] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia

[5] Univ Sydney, ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW 2006, Australia

[6] Univ Sydney, Sydney Inst Astron, Sydney, NSW 2006, Australia

[7] Univ Melbourne, Sch Phys, Melbourne, Vic, Australia

[8] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[9] Raman Res Inst, Bangalore 560080, Karnataka, India

[10] Curtin Univ Technol, Int Ctr Radio Astron Res, Perth, WA, Australia

[11] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Melbourne, Vic, Australia

[12] CSIRO Astron & Space Sci, Epping, NSW, Australia

[13] MIT, Haystack Observ, Westford, MA 01886 USA

[14] Univ Wisconsin Milwaukee, Dept Phys, Milwaukee, WI USA

[15] NRAO, Charlottesville, VA USA

[16] Univ Tasmania, Sch Math & Phys, Hobart, Tas, Australia

[17] Perth Observ, Perth, WA, Australia

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 755卷 / 01期

基金：

澳大利亚研究理事会; 美国国家科学基金会;

关键词：

dark ages; reionization; first stars; instrumentation: interferometers; methods: data analysis; surveys; NRAO PMN SURVEYS; SPECTRUM RADIO-SOURCES; 21 CENTIMETER TOMOGRAPHY; HIGH-REDSHIFT UNIVERSE; VLA SKY SURVEY; 6C SURVEY; SOURCE CATALOG; REIONIZATION EPOCH; ZONE; 30-DEGREES-LESS-THAN-DELTA-LESS-THAN-51-DEGREES; INTERGALACTIC MEDIUM;

D O I：

10.1088/0004-637X/755/1/47

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 degrees diameter fields in the southern sky, covering a total of similar to 2700 deg(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 similar to 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.

引用

页数：19

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