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Parkes observations for project P986 semester 2018OCTS_02
Pulsar survey is one of the top priorities of the Square Kilometer Arrays (SKA). The discovery of pulsars in relativistic binaries, pulsars in binary with black holes and pulsars in the Galactic Center (GC) will improve our understanding of gravity theories, physics of black holes and stellar population and environment in the GC region. However, co... morenventional periodic searches for pulsars are only sensitive to strictly periodic signals with low duty cycles. Although various methods have been developed to search for pulsars in these extreme systems, it is still very challenging and computationally expensive.
One of the solutions is to find pulsar candidates in radio continuum surveys and then carry out targeted searches (e.g. Frail et al 2017). This technique allows a search over the full field of view while avoiding the need for expensive pixel-by-pixel high time resolution searches. We propose to observe 32 compact, steep spectrum candidates selected from NVSS and TGSS surveys using the Ultra-Wideband Low (UWL) receiver. The frequency coverage (as low as 700MHz) and low system temperature (~20K) of UWL will enable us to carry out a sensitive search of steep spectrum sources. less
Astronomical and Space Sciences not elsewhere classified
01 Oct 2018
01 Apr 2019
Creative Commons Attribution 4.0 International Licence
Kumamoto, Hiroki; Hobbs, George; Dai, Shi; Takahashi, Keitaro (2018): Parkes observations for project P986 semester 2018OCTS_02. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2018.
The metadata and files (if any) are available to the public.
Australia Telescope National Facility
P986 - Targeted search of steep spectrum sources with the Ultra-Wideband receiver
Pulsars are neutron stars with strong magnetic fields. Radio emissions coming out from their magnetosphere form a beam and produce a pulse every time pointing towards us. Pulsars are extremely compact and dense, with diameters of about 10km and mass of about one solar mass. Studies of pulsars enable us to understand physics of dense matter and natu... morere of gravitational fields. However, pulsars are not easy to find, and the fact that some of them are in binary systems makes it even harder to find the periodic signals.
We propose to search for pulsars in radio images, where pulsars look like point sources. Two large radio surveys at different observing frequencies have been used to select pulsar candidates. Sources that are compact (point-like) and have flux densities larger at lower frequencies have been chosen, and we found that we can successfully identify known pulsars. Besides known pulsars, 32 sources with unknown nature have been selected and they are very likely to be pulsars. Therefore, we propose to use the Parkes telescope to observe these 32 candidates and search for their periodic signals. less
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