Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism
We report on observations of giant pulses from the Crab pulsar performed simultaneously with the Parkes radio telescope and the incoherent combination of the Murchison Widefield Array (MWA) antenna tiles. The observations were performed over a duration of approximately one hour at a center frequency...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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IOP PUBLISHING LTD
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/43493 |
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| author | Oronsaye, S. Ord, Stephen Bhat, Ramesh Tremblay, Steven McSweeney, Sam Tingay, Steven Van Straten, W. Jameson, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. |
| author_facet | Oronsaye, S. Ord, Stephen Bhat, Ramesh Tremblay, Steven McSweeney, Sam Tingay, Steven Van Straten, W. Jameson, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. |
| author_sort | Oronsaye, S. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We report on observations of giant pulses from the Crab pulsar performed simultaneously with the Parkes radio telescope and the incoherent combination of the Murchison Widefield Array (MWA) antenna tiles. The observations were performed over a duration of approximately one hour at a center frequency of 1382 MHz with 340 MHz bandwidth at Parkes, and at a center frequency of 193 MHz with 15 MHz bandwidth at the MWA. Our analysis has led to the detection of 55 giant pulses at the MWA and 2075 at Parkes above a threshold of 3.5σ and 6.5σ, respectively. We detected 51% of the MWA giant pulses at the Parkes radio telescope, with spectral indices in the range of-3.6 > α > -4.9 (Sv μ ∝ Va). We present a Monte Carlo analysis supporting the conjecture that the giant pulse emission in the Crab is intrinsically broadband, the less than 100% correlation being due to the relative sensitivities of the two instruments and the width of the spectral index distribution. Our observations are consistent with the hypothesis that the spectral index of giant pulses is drawn from normal distribution of standard deviation 0.6, but with a mean that displays an evolution with frequency from −3.00 at 1382 MHz, to −2.85 at 192 MHz. |
| first_indexed | 2025-11-14T09:16:30Z |
| format | Journal Article |
| id | curtin-20.500.11937-43493 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:16:30Z |
| publishDate | 2015 |
| publisher | IOP PUBLISHING LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-434932017-09-13T14:01:05Z Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism Oronsaye, S. Ord, Stephen Bhat, Ramesh Tremblay, Steven McSweeney, Sam Tingay, Steven Van Straten, W. Jameson, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. We report on observations of giant pulses from the Crab pulsar performed simultaneously with the Parkes radio telescope and the incoherent combination of the Murchison Widefield Array (MWA) antenna tiles. The observations were performed over a duration of approximately one hour at a center frequency of 1382 MHz with 340 MHz bandwidth at Parkes, and at a center frequency of 193 MHz with 15 MHz bandwidth at the MWA. Our analysis has led to the detection of 55 giant pulses at the MWA and 2075 at Parkes above a threshold of 3.5σ and 6.5σ, respectively. We detected 51% of the MWA giant pulses at the Parkes radio telescope, with spectral indices in the range of-3.6 > α > -4.9 (Sv μ ∝ Va). We present a Monte Carlo analysis supporting the conjecture that the giant pulse emission in the Crab is intrinsically broadband, the less than 100% correlation being due to the relative sensitivities of the two instruments and the width of the spectral index distribution. Our observations are consistent with the hypothesis that the spectral index of giant pulses is drawn from normal distribution of standard deviation 0.6, but with a mean that displays an evolution with frequency from −3.00 at 1382 MHz, to −2.85 at 192 MHz. 2015 Journal Article http://hdl.handle.net/20.500.11937/43493 10.1088/0004-637X/809/1/51 IOP PUBLISHING LTD fulltext |
| spellingShingle | Oronsaye, S. Ord, Stephen Bhat, Ramesh Tremblay, Steven McSweeney, Sam Tingay, Steven Van Straten, W. Jameson, A. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Deshpande, A. Greenhill, L. Hazelton, B. Johnston-Hollitt, M. Kaplan, D. Lonsdale, C. McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Shankar, N. Srivani, K. Subrahmanyan, R. Wayth, Randall Webster, R. Williams, A. Williams, C. Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title | Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title_full | Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title_fullStr | Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title_full_unstemmed | Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title_short | Simultaneous observations of giant pulses from the Crab pulsar, with the Murchison Widefield Array and Parkes radio telescope: implications for the giant pulse emission mechanism |
| title_sort | simultaneous observations of giant pulses from the crab pulsar, with the murchison widefield array and parkes radio telescope: implications for the giant pulse emission mechanism |
| url | http://hdl.handle.net/20.500.11937/43493 |