Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies
Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal low-frequency (?300 MHz) coverage. We present the first low-frequency detection of the intermittent pulsar J1107-5907 with the Murchison Widefield Ar...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Institute of Physics Publishing
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/74533 |
| _version_ | 1848763301641584640 |
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| author | Meyers, B. Tremblay, S. Bhat, Ramesh Flynn, C. Gupta, V. Shannon, Ryan Murray, Steven Sobey, Charlotte Ord, S. Oslowski, S. Crosse, B. Williams, Andrew Jankowski, F. Farah, W. Krishnan, V. Bateman, T. Bailes, M. Beardsley, A. Emrich, David Franzen, Thomas Gaensler, B. Horsley, L. Johnston-Hollitt, M. Kaplan, D. Kenney, David Morales, M. Pallot, D. Steele, K. Tingay, Steven Trott, Cathryn Walker, M. Wayth, Randall Wu, C. |
| author_facet | Meyers, B. Tremblay, S. Bhat, Ramesh Flynn, C. Gupta, V. Shannon, Ryan Murray, Steven Sobey, Charlotte Ord, S. Oslowski, S. Crosse, B. Williams, Andrew Jankowski, F. Farah, W. Krishnan, V. Bateman, T. Bailes, M. Beardsley, A. Emrich, David Franzen, Thomas Gaensler, B. Horsley, L. Johnston-Hollitt, M. Kaplan, D. Kenney, David Morales, M. Pallot, D. Steele, K. Tingay, Steven Trott, Cathryn Walker, M. Wayth, Randall Wu, C. |
| author_sort | Meyers, B. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal low-frequency (?300 MHz) coverage. We present the first low-frequency detection of the intermittent pulsar J1107-5907 with the Murchison Widefield Array (MWA) at 154 MHz and the simultaneous detection from the recently upgraded Molonglo Observatory Synthesis Telescope (UTMOST) at 835 MHz, as part of an ongoing observing campaign. During a 30 minute simultaneous observation, we detected the pulsar in its bright emission state for approximately 15 minutes, where 86 and 283 pulses were detected above a signal-to-noise threshold of 6 with the MWA and UTMOST, respectively. Of the detected pulses, 51 had counterparts at both frequencies and exhibited steep spectral indices for both the bright main pulse component and the precursor component. We find that the bright state pulse energy distribution is best parameterized by a log-normal distribution at both frequencies, contrary to previous results that suggested a power law distribution. Further low-frequency observations are required in order to explore in detail aspects such as pulse-to-pulse variability and intensity modulations, as well as to better constrain the signal propagation effects due to the interstellar medium and intermittency characteristics at these frequencies. The spectral index, extended profile emission covering a large fraction of pulse longitude, and the broadband intermittency of PSR J1107-5907 suggest that future low-frequency pulsar searches - for instance, those planned with SKA-Low - will be in an excellent position to find and investigate new pulsars of this type. |
| first_indexed | 2025-11-14T11:01:17Z |
| format | Journal Article |
| id | curtin-20.500.11937-74533 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:01:17Z |
| publishDate | 2018 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-745332019-08-07T03:52:20Z Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies Meyers, B. Tremblay, S. Bhat, Ramesh Flynn, C. Gupta, V. Shannon, Ryan Murray, Steven Sobey, Charlotte Ord, S. Oslowski, S. Crosse, B. Williams, Andrew Jankowski, F. Farah, W. Krishnan, V. Bateman, T. Bailes, M. Beardsley, A. Emrich, David Franzen, Thomas Gaensler, B. Horsley, L. Johnston-Hollitt, M. Kaplan, D. Kenney, David Morales, M. Pallot, D. Steele, K. Tingay, Steven Trott, Cathryn Walker, M. Wayth, Randall Wu, C. Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal low-frequency (?300 MHz) coverage. We present the first low-frequency detection of the intermittent pulsar J1107-5907 with the Murchison Widefield Array (MWA) at 154 MHz and the simultaneous detection from the recently upgraded Molonglo Observatory Synthesis Telescope (UTMOST) at 835 MHz, as part of an ongoing observing campaign. During a 30 minute simultaneous observation, we detected the pulsar in its bright emission state for approximately 15 minutes, where 86 and 283 pulses were detected above a signal-to-noise threshold of 6 with the MWA and UTMOST, respectively. Of the detected pulses, 51 had counterparts at both frequencies and exhibited steep spectral indices for both the bright main pulse component and the precursor component. We find that the bright state pulse energy distribution is best parameterized by a log-normal distribution at both frequencies, contrary to previous results that suggested a power law distribution. Further low-frequency observations are required in order to explore in detail aspects such as pulse-to-pulse variability and intensity modulations, as well as to better constrain the signal propagation effects due to the interstellar medium and intermittency characteristics at these frequencies. The spectral index, extended profile emission covering a large fraction of pulse longitude, and the broadband intermittency of PSR J1107-5907 suggest that future low-frequency pulsar searches - for instance, those planned with SKA-Low - will be in an excellent position to find and investigate new pulsars of this type. 2018 Journal Article http://hdl.handle.net/20.500.11937/74533 10.3847/1538-4357/aaee7b Institute of Physics Publishing restricted |
| spellingShingle | Meyers, B. Tremblay, S. Bhat, Ramesh Flynn, C. Gupta, V. Shannon, Ryan Murray, Steven Sobey, Charlotte Ord, S. Oslowski, S. Crosse, B. Williams, Andrew Jankowski, F. Farah, W. Krishnan, V. Bateman, T. Bailes, M. Beardsley, A. Emrich, David Franzen, Thomas Gaensler, B. Horsley, L. Johnston-Hollitt, M. Kaplan, D. Kenney, David Morales, M. Pallot, D. Steele, K. Tingay, Steven Trott, Cathryn Walker, M. Wayth, Randall Wu, C. Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title | Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title_full | Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title_fullStr | Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title_full_unstemmed | Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title_short | Hunting for Radio Emission from the Intermittent Pulsar J1107-5907 at Low Frequencies |
| title_sort | hunting for radio emission from the intermittent pulsar j1107-5907 at low frequencies |
| url | http://hdl.handle.net/20.500.11937/74533 |