Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array
We present a survey for transient and variable sources, on time-scales from 28 s to ~1 yr, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified, making this the most constraining low-frequency survey to date and plac...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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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/20.500.11937/3622 |
| _version_ | 1848744281582338048 |
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| author | Rowlinson, A. Bell, M. Murphy, T. Trott, C. Hurley-Walker, N. Johnston, S. Tingay, Steven Kaplan, D. Carbone, D. Hancock, P. Feng, L. Offringa, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Gaensler, B. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. |
| author_facet | Rowlinson, A. Bell, M. Murphy, T. Trott, C. Hurley-Walker, N. Johnston, S. Tingay, Steven Kaplan, D. Carbone, D. Hancock, P. Feng, L. Offringa, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Gaensler, B. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. |
| author_sort | Rowlinson, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present a survey for transient and variable sources, on time-scales from 28 s to ~1 yr, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified, making this the most constraining low-frequency survey to date and placing a limit on the surface density of transients of <4.1 × 10-7 deg-2 for the shortest time-scale considered. At these frequencies, emission from Fast Radio Bursts (FRBs) is expected to be detectable in the shortest time-scale images without any corrections for interstellar or intergalactic dispersion. At an FRB limiting flux density of 7980 Jy, we find a rate of <82 FRBs per sky per day for dispersion measures <700 pc cm-3. Assuming a cosmological population of standard candles, our rate limits are consistent with the FRB rates obtained by Thornton et al. if they have a flat spectral slope. Finally, we conduct an initial variability survey of sources in the field with flux densities = 0.5 Jy and identify no sources with significant variability in their light curves. However, we note that substantial further work is required to fully characterize both the short-term and low-level variability within this field. |
| first_indexed | 2025-11-14T05:58:58Z |
| format | Journal Article |
| id | curtin-20.500.11937-3622 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T05:58:58Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-36222017-09-13T14:44:02Z Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array Rowlinson, A. Bell, M. Murphy, T. Trott, C. Hurley-Walker, N. Johnston, S. Tingay, Steven Kaplan, D. Carbone, D. Hancock, P. Feng, L. Offringa, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Gaensler, B. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. We present a survey for transient and variable sources, on time-scales from 28 s to ~1 yr, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified, making this the most constraining low-frequency survey to date and placing a limit on the surface density of transients of <4.1 × 10-7 deg-2 for the shortest time-scale considered. At these frequencies, emission from Fast Radio Bursts (FRBs) is expected to be detectable in the shortest time-scale images without any corrections for interstellar or intergalactic dispersion. At an FRB limiting flux density of 7980 Jy, we find a rate of <82 FRBs per sky per day for dispersion measures <700 pc cm-3. Assuming a cosmological population of standard candles, our rate limits are consistent with the FRB rates obtained by Thornton et al. if they have a flat spectral slope. Finally, we conduct an initial variability survey of sources in the field with flux densities = 0.5 Jy and identify no sources with significant variability in their light curves. However, we note that substantial further work is required to fully characterize both the short-term and low-level variability within this field. 2016 Journal Article http://hdl.handle.net/20.500.11937/3622 10.1093/mnras/stw451 Oxford University Press fulltext |
| spellingShingle | Rowlinson, A. Bell, M. Murphy, T. Trott, C. Hurley-Walker, N. Johnston, S. Tingay, Steven Kaplan, D. Carbone, D. Hancock, P. Feng, L. Offringa, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Gaensler, B. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Udaya Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title_full | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title_fullStr | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title_full_unstemmed | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title_short | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array |
| title_sort | limits on fast radio bursts and other transient sources at 182 mhz using the murchison widefield array |
| url | http://hdl.handle.net/20.500.11937/3622 |