A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field
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 Arr...
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| Format: | Journal Article |
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Oxford University Press
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/24973 |
| _version_ | 1848751577330876416 |
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| author | Carroll, P. Line, J. Morales, M. Barry, N. Beardsley, A. Hazelton, B. Jacobs, D. Pober, J. Sullivan, I. Webster, R. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. de Oliveira-Costa, A. Dillon, J. Emrich, D. Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hewitt, N. Hurley-Walker, N. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kim, H. Kratzenberg, E. Lenc, E. Loeb, A. Lonsdale, C. Lynch, M. McKinley, B. McWhirter, S. Mitchell, D. Morgan, E. Neben, A. Oberoi, D. Offringa, A. Ord, S. Paul, S. Pindor, B. Prabu, T. Procopio, P. Riding, J. Rogers, A. Roshi, A. Shankar, N. Sethi, S. Srivani, K. Subrahmanyan, R. Tegmark, M. Thyagarajan, N. Tingay, Steven Trott, C. Waterson, M. Wayth, Randall Whitney, A. Williams, A. Williams, C. Wu, C. Wyithe, J. |
| author_facet | Carroll, P. Line, J. Morales, M. Barry, N. Beardsley, A. Hazelton, B. Jacobs, D. Pober, J. Sullivan, I. Webster, R. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. de Oliveira-Costa, A. Dillon, J. Emrich, D. Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hewitt, N. Hurley-Walker, N. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kim, H. Kratzenberg, E. Lenc, E. Loeb, A. Lonsdale, C. Lynch, M. McKinley, B. McWhirter, S. Mitchell, D. Morgan, E. Neben, A. Oberoi, D. Offringa, A. Ord, S. Paul, S. Pindor, B. Prabu, T. Procopio, P. Riding, J. Rogers, A. Roshi, A. Shankar, N. Sethi, S. Srivani, K. Subrahmanyan, R. Tegmark, M. Thyagarajan, N. Tingay, Steven Trott, C. Waterson, M. Wayth, Randall Whitney, A. Williams, A. Williams, C. Wu, C. Wyithe, J. |
| author_sort | Carroll, P. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 ~1400 deg2 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. |
| first_indexed | 2025-11-14T07:54:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-24973 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:54:56Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-249732017-09-13T15:20:29Z A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field Carroll, P. Line, J. Morales, M. Barry, N. Beardsley, A. Hazelton, B. Jacobs, D. Pober, J. Sullivan, I. Webster, R. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. de Oliveira-Costa, A. Dillon, J. Emrich, D. Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hewitt, N. Hurley-Walker, N. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kim, H. Kratzenberg, E. Lenc, E. Loeb, A. Lonsdale, C. Lynch, M. McKinley, B. McWhirter, S. Mitchell, D. Morgan, E. Neben, A. Oberoi, D. Offringa, A. Ord, S. Paul, S. Pindor, B. Prabu, T. Procopio, P. Riding, J. Rogers, A. Roshi, A. Shankar, N. Sethi, S. Srivani, K. Subrahmanyan, R. Tegmark, M. Thyagarajan, N. Tingay, Steven Trott, C. Waterson, M. Wayth, Randall Whitney, A. Williams, A. Williams, C. Wu, C. Wyithe, J. 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 ~1400 deg2 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. 2016 Journal Article http://hdl.handle.net/20.500.11937/24973 10.1093/mnras/stw1599 Oxford University Press fulltext |
| spellingShingle | Carroll, P. Line, J. Morales, M. Barry, N. Beardsley, A. Hazelton, B. Jacobs, D. Pober, J. Sullivan, I. Webster, R. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. de Oliveira-Costa, A. Dillon, J. Emrich, D. Ewall-Wice, A. Feng, L. Gaensler, B. Goeke, R. Greenhill, L. Hewitt, N. Hurley-Walker, N. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kim, H. Kratzenberg, E. Lenc, E. Loeb, A. Lonsdale, C. Lynch, M. McKinley, B. McWhirter, S. Mitchell, D. Morgan, E. Neben, A. Oberoi, D. Offringa, A. Ord, S. Paul, S. Pindor, B. Prabu, T. Procopio, P. Riding, J. Rogers, A. Roshi, A. Shankar, N. Sethi, S. Srivani, K. Subrahmanyan, R. Tegmark, M. Thyagarajan, N. Tingay, Steven Trott, C. Waterson, M. Wayth, Randall Whitney, A. Williams, A. Williams, C. Wu, C. Wyithe, J. A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title | A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title_full | A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title_fullStr | A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title_full_unstemmed | A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title_short | A high reliability survey of discrete Epoch of Reionization foreground sources in the MWA EoR0 field |
| title_sort | high reliability survey of discrete epoch of reionization foreground sources in the mwa eor0 field |
| url | http://hdl.handle.net/20.500.11937/24973 |