A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field

被引：28

作者：

Carroll, P. A. ^{[1
]}

Line, J. ^{[2
,3
]}

Morales, M. F. ^{[1
]}

Barry, N. ^{[1
]}

Beardsley, A. P. ^{[1
,4
]}

Hazelton, B. J. ^{[1
,5
]}

Jacobs, D. C. ^{[4
]}

Pober, J. C. ^{[1
,6
]}

Sullivan, I. S. ^{[1
]}

Webster, R. L. ^{[2
,3
]}

Bernardi, G. ^{[7
,8
]}

Bowman, J. D. ^{[4
]}

Briggs, F. ^{[3
,9
]}

Cappallo, R. J. ^{[10
]}

Corey, B. E. ^{[10
]}

de Oliveira-Costa, A. ^{[11
]}

Dillon, J. S. ^{[11
,12
]}

Emrich, D. ^{[13
]}

Ewall-Wice, A. ^{[11
]}

Feng, L. ^{[11
]}

Gaensler, B. M. ^{[3
,14
,15
]}

Goeke, R. ^{[11
]}

Greenhill, L. J. ^{[16
]}

Hewitt, J. N. ^{[11
]}

Hurley-Walker, N. ^{[13
]}

Johnston-Hollitt, M. ^{[17
]}

Kaplan, D. L. ^{[18
]}

Kasper, J. C. ^{[16
,19
]}

Kim, H. S. ^{[2
,3
]}

Kratzenberg, E. ^{[10
]}

Lenc, E. ^{[3
,15
]}

Loeb, A. ^{[16
]}

Lonsdale, C. J. ^{[10
]}

Lynch, M. J. ^{[13
]}

McKinley, B. ^{[2
,3
]}

McWhirter, S. R. ^{[10
]}

Mitchell, D. A. ^{[3
,20
]}

Morgan, E. ^{[11
]}

Neben, A. R. ^{[11
]}

Oberoi, D. ^{[21
]}

Offringa, A. R. ^{[3
,22
]}

Ord, S. M. ^{[3
,13
]}

Paul, S. ^{[23
]}

Pindor, B. ^{[2
,3
]}

Prabu, T. ^{[23
]}

Procopio, P. ^{[2
,3
]}

Riding, J. ^{[2
,3
]}

Rogers, A. E. E. ^{[10
]}

Roshi, A. ^{[24
]}

Shankar, N. Udaya ^{[23
]}

机构：

[1] Univ Washington, Seattle, WA 98195 USA

[2] Univ Melbourne, Parkville, Vic 3010, Australia

[3] ARC Ctr Excellence All Sky Astrophys CAASTRO, Redfern, NSW 2016, Australia

[4] Univ Washington, ESci Inst, Seattle, WA 98195 USA

[5] Arizona State Univ, Tempe, AZ 85287 USA

[6] Brown Univ, Providence, RI 02912 USA

[7] SKA SA, ZA-7405 Cape Town, South Africa

[8] Rhodes Univ, Dept Phys & Elect, ZA-6139 Grahamstown, South Africa

[9] Australian Natl Univ, Canberra, ACT 0200, Australia

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

[11] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[12] Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia

[13] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[14] Univ Sydney, Sydney, NSW 2006, Australia

[15] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[16] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand

[17] Univ Wisconsin, Milwaukee, WI 53211 USA

[18] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA

[19] CSIRO Astron & Space Sci CASS, Marsfield, NSW 2122, Australia

[20] Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[21] Netherlands Inst Radio Astron ASTRON, NL-7991 PD Dwingeloo, Netherlands

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

[23] Natl Radio Astron Observ, Edgemont Rd, Charlottesville, VA 22903 USA

[24] Univ Western Australia, Int Ctr Radio Astron Res, Perth, WA 6009, Australia

[25] Univ Calif Berkeley, Berkeley, CA 94720 USA

[26] Jodrell Bank, SKA Org Headquarters, Macclesfield SK11 9DL, Cheshire, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 461卷 / 04期

基金：

美国国家科学基金会;

关键词：

catalogues; RADIO; SKY; DECONVOLUTION; SPECTRUM;

D O I：

10.1093/mnras/stw1599

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detection of the epoch of reionization HI signal requires a precise understanding of the intervening galaxies and AGN, both for instrumental calibration and foreground removal. We present a catalogue of 7394 extragalactic sources at 182 MHz detected in the RA = 0 field of the Murchison Widefield Array Epoch of Reionization observation programme. Motivated by unprecedented requirements for precision and reliability we develop new methods for source finding and selection. We apply machine learning methods to self-consistently classify the relative reliability of 9490 source candidates. A subset of 7466 are selected based on reliability class and signal-to-noise ratio criteria. These are statistically cross-matched to four other radio surveys using both position and flux density information. We find 7369 sources to have confident matches, including 90 partially resolved sources that split into a total of 192 sub-components. An additional 25 unmatched sources are included as new radio detections. The catalogue sources have a median spectral index of -0.85. Spectral flattening is seen towards lower frequencies with a median of -0.71 predicted at 182 MHz. The astrometric error is 7 arcsec compared to a 2.3 arcmin beam FWHM. The resulting catalogue covers similar to 1400 deg(2) and is complete to approximately 80 mJy within half beam power. This provides the most reliable discrete source sky model available to date in the MWA EoR0 field for precision foreground subtraction.

引用

页码：4151 / 4175

页数：25

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