Title:	Scintillation-based Search for Off-pulse Radio Emission from Pulsars
Authors:	Ravi, Kumar Deshpande, A.A.
Keywords:	ISM: general – methods observational – pulsars general – radio continuum general – scattering – techniques high angular resolution
Issue Date:	20-May-2018
Publisher:	IOP Sciences for The American Astronomical Society
Citation:	Astrophysical Journal, 2018, Vol. 859, p22
Abstract:	We propose a new method to detect off-pulse (unpulsed and/or continuous) emission from pulsars using the intensity modulations associated with interstellar scintillation. Our technique involves obtaining the dynamic spectra, separately for on-pulse window and off-pulse region, with time and frequency resolutions to properly sample the intensity variations due to diffractive scintillation and then estimating their mutual correlation as a measure of off-pulse emission, if any. We describe and illustrate the essential details of this technique with the help of simulations, as well as real data. We also discuss the advantages of this method over earlier approaches to detect off-pulse emission. In particular, we point out how certain nonidealities inherent to measurement setups could potentially affect estimations in earlier approaches and argue that the present technique is immune to such nonidealities. We verify both of the above situations with relevant simulations. We apply this method to the observation of PSR B0329+54 at frequencies of 730 and 810 MHz made with the Green Bank Telescope and present upper limits for the off-pulse intensity at the two frequencies. We expect this technique to pave the way for extensive investigations of off-pulse emission with the help of existing dynamic spectral data on pulsars and, of course, with more sensitive long-duration data from new observations.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6907
ISSN:	0004-637X 1538-4357-(Online)
Alternative Location:	https://arxiv.org/abs/1706.08896?context=astro-ph http://inspirehep.net/record/1607777/plots https://doi.org/10.3847/1538-4357/aab60d
Copyright:	2018 The American Astronomical Society
Appears in Collections:	Research Papers (A&A)

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