The High Time Resolution Universe Pulsar Survey - III. Single-pulse searches and preliminary analysis
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We present the search methods and initial results for transient radio signals in the High Time Resolution Universe (HTRU) survey. The HTRU survey's single-pulse search, the software designed to perform the search and a determination of the HTRU survey's sensitivity to single pulses are described. Initial processing of a small fraction of the survey has produced 11 discoveries, all of which are sparsely emitting neutron stars, as well as provided confirmation of two previously unconfirmed neutron stars. Most of the newly discovered objects lie in regions surveyed previously, indicating both the improved sensitivity of the HTRU survey observing system and the dynamic nature of the radio sky. The cycles of active and null states in nulling pulsars, rotating radio transients (RRATs) and long-term intermittent pulsars are explored in the context of determining the relationship between these populations and of the sensitivity of a search to the various radio-intermittent neutron star populations. This analysis supports the case that many RRATs are in fact high-null-fraction pulsars (i.e. with a null fraction of ?0.95) and indicates that intermittent pulsars appear distinct from nulling pulsars in their activity cycle time-scales. We find that in the measured population, there is a deficit of pulsars with typical emission time-scales greater than ~300s that is not readily explained by selection effects. The HTRU low-latitude survey will be capable of addressing whether this deficit is physical. We predict that the HTRU survey will explore pulsars with a broad range of nulling fractions (up to and beyond 0.999), and at its completion is likely to increase the currently known RRATs by a factor of more than 2. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
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Coenen, T.; Van Leeuwen, J.; Hessels, J.; Stappers, B.; Kondratiev, V.; Alexov, A.; Breton, R.; Bilous, A.; Cooper, S.; Falcke, H.; Fallows, R.; Gajjar, V.; Grießmeier, J.; Hassall, T.; Karastergiou, A.; Keane, E.; Kramer, M.; Kuniyoshi, M.; Noutsos, A.; Oslowski, S.; Pilia, M.; Serylak, M.; Schrijvers, C.; Sobey, Charlotte; Ter Veen, S.; Verbiest, J.; Weltevrede, P.; Wijnholds, S.; Zagkouris, K.; Van Amesfoort, A.; Anderson, J.; Asgekar, A.; Avruch, I.; Bell, M.; Bentum, M.; Bernardi, G.; Best, P.; Bonafede, A.; Breitling, F.; Broderick, J.; Brüggen, M.; Butcher, H.; Ciardi, B.; Corstanje, A.; Deller, A.; Duscha, S.; Eislöffel, J.; Fender, R.; Ferrari, C.; Frieswijk, W.; Garrett, M.; De Gasperin, F.; De Geus, E.; Gunst, A.; Hamaker, J.; Heald, G.; Hoeft, M.; Van Der Horst, A.; Juette, E.; Kuper, G.; Law, C.; Mann, G.; McFadden, R.; McKay-Bukowski, D.; McKean, J.; Munk, H.; Orru, E.; Paas, H.; Pandey-Pommier, M.; Polatidis, A.; Reich, W.; Renting, A.; Röttgering, H.; Rowlinson, A.; Scaife, A.; Schwarz, D.; Sluman, J.; Smirnov, O.; Swinbank, J. (2014)© 2014 ESO .We have conducted two pilot surveys for radio pulsars and fast transients with the Low-Frequency Array (LOFAR) around 140 MHz and here report on the first low-frequency fast-radio burst limit and the discovery ...
The High Time Resolution Universe pulsar survey – X. Discovery of four millisecond pulsars and updated timing solutions of a further 12Ng, C.; Bailes, M.; Bates, S.; Bhat, Ramesh; Burgay, M.; Burke-Spolaor, S.; Champion, D.; Coster, P.; Johnston, S.; Keith, M.; Kramer, M.; Levin, L.; Petroff, E.; Possenti, A.; Stappers, B.; van Straten, W.; Thornton, D.; Tiburzi, C.; Bassa, C.; Freire, P.; Guillemot, L.; Lyne, A.; Tauris, T.; Shannon, R.; Wex, N. (2014)We report on the discovery of four millisecond pulsars (MSPs) in the High Time Resolution Universe (HTRU) pulsar survey being conducted at the Parkes 64 m radio telescope. All four MSPs are in binary systems and are likely ...
Tiburzi, C.; Johnston, S.; Bailes, M.; Bates, S.; Bhat, Ramesh; Burgay, M.; Burke-Spolaor, S.; Champion, D.; Coster, P.; D'Amico, N.; Keith, M.; Kramer, M.; Levin, L.; Milia, S.; Ng, C.; Possenti, A.; Stappers, B.; Thornton, D.; van Straten, W. (2013)We present a polarimetric analysis of 49 long-period pulsars discovered as part of the High Time Resolution Universe (HTRU) southern survey. The sources exhibit the typical characteristics of 'old' pulsars, with low ...