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Home List of Titles Enhanced pulsar and single pulse detection via automated radio frequency interference detection in multipixel feeds
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/211753
- Enhanced pulsar and single pulse detection via automated radio frequency interference detection in multipixel feeds
- Kocz, J.; Bailes, M.; Barnes, D.; Burke-Spolaor, S.; Levin, L.
- Single pixel feeds on large aperture radio telescopes have the ability to detect weak (∼10 mJy) impulsive bursts of radio emission and sub-mJy radio pulsars. Unfortunately, in large-scale blind surveys, radio frequency interference (RFI) mimics both radio bursts and radio pulsars, greatly reducing the sensitivity to new discoveries as real signals of astronomical origin get lost among the millions of false candidates. In this paper a technique that takes advantage of multipixel feeds to use eigenvector decomposition of common signals is used to greatly facilitate radio burst and pulsar discovery. Since the majority of RFI occurs with zero dispersion, the method was tested on the total power present in the 13 beams of the Parkes multibeam receiver using data from archival intermediate-latitude surveys. The implementation of this method greatly reduced the number of false candidates and led to the discovery of one new rotating radio transient or RRAT, six new pulsars and five new pulses that shared the swept-frequency characteristics similar in nature to the `Lorimer burst'. These five new signals occurred within minutes of 11 previous detections of a similar type. When viewed together, they display temporal characteristics related to integer seconds, with non-random distributions and characteristic ‘gaps’ between them, suggesting they are not from a naturally occurring source. Despite the success in removing RFI, false candidates present in the data that are only visible after integrating in time or at non-zero dispersion remained. It is demonstrated that with some computational penalty, the method can be applied iteratively at all trial dispersions and time resolutions to remove the vast majority of spurious candidates.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 420, no. 1 (Feb 2012), pp. 271-278
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Instrumentation; Pulsars; Radio frequency interference
- Wiley-Blackwell Publishing
- Publisher URL
- Copyright © 2011 The Authors. Monthly Notices of the Royal Astronomical Society copyright © 2011 RAS.
- Research Projects
- Peer reviewed