8 results on '"D. Temby"'
Search Results
2. Five new real-time detections of fast radio bursts with UTMOST
- Author
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W Farah, C Flynn, M Bailes, A Jameson, T Bateman, D Campbell-Wilson, C K Day, A T Deller, A J Green, V Gupta, R Hunstead, M E Lower, S Osłowski, A Parthasarathy, D C Price, V Ravi, R M Shannon, A Sutherland, D Temby, V Venkatraman Krishnan, M Caleb, S-W Chang, M Cruces, J Roy, V Morello, C A Onken, B W Stappers, S Webb, and C Wolf
- Published
- 2019
- Full Text
- View/download PDF
3. Five new real-time detections of Fast Radio Bursts with UTMOST
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V. Gupta, C. A. Onken, A. J. Green, Jayashree Roy, Richard W. Hunstead, V. Venkatraman Krishnan, Stefan Oslowski, A. Jameson, M. Caleb, Benjamin Stappers, Chris Flynn, Danny C. Price, Marcus E. Lower, M. Cruces, D. Campbell-Wilson, A. Deller, Christian Wolf, Cherie K. Day, Aditya Parthasarathy, Sara Webb, D. Temby, Ryan Shannon, T. Bateman, Vincent Morello, Matthew Bailes, V. Ravi, Seo-Won Chang, A. Sutherland, and Wael Farah
- Subjects
High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,Spectral index ,Scattering ,Fast radio burst ,FOS: Physical sciences ,Astronomy and Astrophysics ,Ranging ,Time resolution ,Astrophysics ,01 natural sciences ,Spectral line ,Radio telescope ,Space and Planetary Science ,0103 physical sciences ,Intergalactic travel ,Astrophysics - High Energy Astrophysical Phenomena ,010306 general physics ,010303 astronomy & astrophysics - Abstract
We detail a new fast radio burst (FRB) survey with the Molonglo Radio Telescope, in which six FRBs were detected between June 2017 and December 2018. By using a real-time FRB detection system, we captured raw voltages for five of the six events, which allowed for coherent dedispersion and very high time resolution (10.24 $\mu$s) studies of the bursts. Five of the FRBs show temporal broadening consistent with interstellar and/or intergalactic scattering, with scattering timescales ranging from 0.16 to 29.1 ms. One burst, FRB181017, shows remarkable temporal structure, with 3 peaks each separated by 1 ms. We searched for phase-coherence between the leading and trailing peaks and found none, ruling out lensing scenarios. Based on this survey, we calculate an all-sky rate at 843 MHz of $98^{+59}_{-39}$ events sky$^{-1}$ day$^{-1}$ to a fluence limit of 8 Jy-ms: a factor of 7 below the rates estimated from the Parkes and ASKAP telescopes at 1.4 GHz assuming the ASKAP-derived spectral index $\alpha=-1.6$ ($F_{\nu}\propto\nu^{\alpha}$). Our results suggest that FRB spectra may turn over below 1 GHz. Optical, radio and X-ray followup has been made for most of the reported bursts, with no associated transients found. No repeat bursts were found in the survey., Comment: 13 pages, 11 figures, submitted to MNRAS
- Published
- 2019
4. The UTMOST Survey for Magnetars, Intermittent pulsars, RRATs and FRBs I: System description and overview
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Matthew Bailes, Fabian Jankowski, D. Temby, Danny C. Price, K. Plant, Evan Keane, Chris Flynn, Andrew Jameson, Aditya Parthasarathy, T. Bateman, D. Campbell-Wilson, Cherie K. Day, V. Gupta, W. van Straten, Marcus E. Lower, A. J. Green, Richard W. Hunstead, V. Venkatraman Krishnan, Shivani Bhandari, M. Caleb, Adam Deller, Stefan Oslowski, Ewan Barr, Pablo Rosado, and Wael Farah
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Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Magnetar ,01 natural sciences ,Electromagnetic interference ,law.invention ,Telescope ,Pulsar ,law ,0103 physical sciences ,010303 astronomy & astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Astrophysics::Galaxy Astrophysics ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,010308 nuclear & particles physics ,Single pulse ,Astronomy ,Astronomy and Astrophysics ,Galactic plane ,Interferometry ,Space and Planetary Science ,Data analysis ,Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We describe the ongoing `Survey for Magnetars, Intermittent pulsars, Rotating radio transients and Fast radio bursts' (SMIRF), performed using the newly refurbished UTMOST telescope. SMIRF repeatedly sweeps the southern Galactic plane performing real-time periodicity and single-pulse searches, and is the first survey of its kind carried out with an interferometer. SMIRF is facilitated by a robotic scheduler which is capable of fully autonomous commensal operations. We report on the SMIRF observational parameters, the data analysis methods, the survey's sensitivities to pulsars, techniques to mitigate radio frequency interference and present some early survey results. UTMOST's wide field of view permits a full sweep of the Galactic plane to be performed every fortnight, two orders of magnitude faster than previous surveys. In the six months of operations from January to June 2018, we have performed $\sim 10$ sweeps of the Galactic plane with SMIRF. Notable blind re-detections include the magnetar PSR J1622$-$4950, the RRAT PSR J0941$-$3942 and the eclipsing pulsar PSR J1748$-$2446A. We also report the discovery of a new pulsar, PSR J1705$-$54. Our follow-up of this pulsar with the UTMOST and Parkes telescopes at an average flux limit of $\leq 20$ mJy and $\leq 0.16$ mJy respectively, categorizes this as an intermittent pulsar with a high nulling fraction of $< 0.002$, Submitted to MNRAS, comments welcome
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- 2019
5. Detection of a Glitch in PSR J0908$-$4913 by UTMOST
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Stefan Oslowski, Marcus E. Lower, A. Sutherland, Simon Johnston, Wael Farah, Duncan Campbell-Wilson, V. Gupta, D. Temby, Ryan Shannon, G. Urquhart, A. Mandlik, T. Bateman, Matthew Bailes, Anne J. Green, Cherie K. Day, V. Venkatraman Krishnan, Chris Flynn, Richard W. Hunstead, Aditya Parthasarathy, Danny C. Price, G. Torr, Andrew Jameson, and Adam T. Deller
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Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Pulsar ,Astronomy ,FOS: Physical sciences ,General Medicine ,Glitch (astronomy) ,Astrophysics - High Energy Astrophysical Phenomena ,Molonglo Observatory Synthesis Telescope - Abstract
We report the first detection of a glitch in the radio pulsar PSR J0908$-$4913 (PSR B0906$-$49) during regular timing observations by the Molonglo Observatory Synthesis Telescope (MOST) as part of the UTMOST project., Comment: 2 pages, 1 table
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- 2019
- Full Text
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6. Detection of a glitch in the pulsar J1709-4429
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Shivani Bhandari, G. Torr, Evan Keane, Richard W. Hunstead, V. Gupta, Stefan Oslowski, Marcus E. Lower, G. Urquhart, Wael Farah, K. Plant, Aditya Parthasarathy, Cherie K. Day, Matthew Bailes, D. Temby, Vikram Ravi, Ewan Barr, Ryan Shannon, T. Bateman, Fabian Jankowski, Chris Flynn, A. J. Green, Adam T. Deller, Duncan Campbell-Wilson, V. Venkatraman Krishnan, Manisha Caleb, Andrew Jameson, and Danny C. Price
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High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,010308 nuclear & particles physics ,Aperture synthesis ,media_common.quotation_subject ,Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Astronomy ,General Medicine ,01 natural sciences ,Glitch ,Radio telescope ,Neutron star ,Pulsar ,Sky ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Molonglo Observatory Synthesis Telescope ,Astrophysics - High Energy Astrophysical Phenomena ,010303 astronomy & astrophysics ,Event (particle physics) ,media_common - Abstract
We report the detection of a glitch event in the pulsar J1709$-$4429 (also known as B1706$-$44) during regular monitoring observations with the Molonglo Observatory Synthesis Telescope (UTMOST). The glitch was found during timing operations, in which we regularly observe over 400 pulsars with up to daily cadence, while commensally searching for Rotating Radio Transients, pulsars, and FRBs. With a fractional size of $\Delta\nu/\nu \approx 52.4 \times10^{-9}$, the glitch reported here is by far the smallest known for this pulsar, attesting to the efficacy of glitch searches with high cadence using UTMOST., Comment: 3 pages, 1 figure
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- 2018
7. The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope
- Author
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M. O'Neill, A. J. Green, Pablo Rosado, D. Campbell-Wilson, Matthew Bailes, Chris Flynn, Richard W. Hunstead, V. Venkatraman Krishnan, Andrew Jameson, F. Jankowski, Tara Murphy, John D. Bunton, Vikram Ravi, Aditya Parthasarathy, Bryan Gaensler, M. Caleb, Ewan Barr, D. Temby, Wael Farah, Evan Keane, Stefan Oslowski, T. Bateman, and Shivani Bhandari
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Physics ,Digital signal processor ,010308 nuclear & particles physics ,business.industry ,Astrophysics::High Energy Astrophysical Phenomena ,Bandwidth (signal processing) ,Astrophysics::Instrumentation and Methods for Astrophysics ,Electrical engineering ,Astronomy and Astrophysics ,01 natural sciences ,law.invention ,Telescope ,Radio telescope ,Pulsar ,Space and Planetary Science ,law ,0103 physical sciences ,Radio frequency ,Molonglo Observatory Synthesis Telescope ,business ,010303 astronomy & astrophysics ,Radio astronomy - Abstract
The Molonglo Observatory Synthesis Telescope (MOST) is an 18000 m2 radio telescope located 40 km from Canberra, Australia. Its operating band (820–851 MHz) is partly allocated to telecommunications, making radio astronomy challenging. We describe how the deployment of new digital receivers, Field Programmable Gate Array-based filterbanks, and server-class computers equipped with 43 Graphics Processing Units, has transformed the telescope into a versatile new instrument (UTMOST) for studying the radio sky on millisecond timescales. UTMOST has 10 times the bandwidth and double the field of view compared to the MOST, and voltage record and playback capability has facilitated rapid implementaton of many new observing modes, most of which operate commensally. UTMOST can simultaneously excise interference, make maps, coherently dedisperse pulsars, and perform real-time searches of coherent fan-beams for dispersed single pulses. UTMOST operates as a robotic facility, deciding how to efficiently target pulsars and how long to stay on source via real-time pulsar folding, while searching for single pulse events. Regular timing of over 300 pulsars has yielded seven pulsar glitches and three Fast Radio Bursts during commissioning. UTMOST demonstrates that if sufficient signal processing is applied to voltage streams, innovative science remains possible even in hostile radio frequency environments.
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- 2017
- Full Text
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8. The pain of redundancy: an exploration of the impact of redundancy for nurse managers in Victoria in the 1990s.
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Richardson M and Temby D
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- Empathy, Fear, Female, Grief, Humans, Interprofessional Relations, Nurse Administrators education, Nurse Administrators supply & distribution, Nursing Methodology Research, Organizational Culture, Pilot Projects, Stress, Psychological etiology, Stress, Psychological prevention & control, Surveys and Questionnaires, Victoria, Adaptation, Psychological, Attitude of Health Personnel, Nurse Administrators psychology, Personnel Downsizing psychology, Stress, Psychological psychology
- Abstract
This article reports on research conducted in 1995 in Victoria, Australia with 12 nurse managers who were displaced through redundancy. This was a pilot study that employed a phenomenological approach to explore the personal impact of redundancy. Participants experienced three differing approaches to the redundancy processes undertaken. Data was managed by a thematic analysis. Powerful themes of being isolated in their agony and fear, of consent under duress, and trauma, emerged from the data. This paper tells the story graphically and emotionally, it is the people's story, an eloquent example of what is missed in current literature.
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- 2000
- Full Text
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