A LOFAR census of non-recycled pulsars: Average profiles, dispersion measures, flux densities, and spectra

Bilous, AV; Kondratiev, VI; Kramer, M; Keane, EF; Hessels, JWT; Stappers, BW; Malofeev, VM; Sobey, C; Breton, RP; Cooper, S; Falcke, H; Karastergiou, A; Michilli, D; Osłowski, S; Sanidas, S; Ter Veen, S; Van Leeuwen, J; Verbiest, JPW; Weltevrede, P; Zarka, P; Grießmeier, JM; Serylak, M; Bell, ME; Broderick, JW; Eislöffel, J; Markoff, S; Rowlinson, A

A LOFAR census of non-recycled pulsars: Average profiles, dispersion measures, flux densities, and spectra

Bilous, AV Kondratiev, VI Kramer, M Keane, EF Hessels, JWT Stappers, BW Malofeev, VM Sobey, C Breton, RP Cooper, S Falcke, H Karastergiou, A Michilli, D Osłowski, S Sanidas, S Ter Veen, S Van Leeuwen, J Verbiest, JPW Weltevrede, P Zarka, P Grießmeier, JM Serylak, M Bell, ME

Broderick, JW Eislöffel, J Markoff, S Rowlinson, A

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Publication Type:: Journal Article
Citation:: Astronomy and Astrophysics, 2016, 591
Issue Date:: 2016-07-01

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Field	Value	Language
dc.contributor.author	Bilous, AV	en_US
dc.contributor.author	Kondratiev, VI	en_US
dc.contributor.author	Kramer, M	en_US
dc.contributor.author	Keane, EF	en_US
dc.contributor.author	Hessels, JWT	en_US
dc.contributor.author	Stappers, BW	en_US
dc.contributor.author	Malofeev, VM	en_US
dc.contributor.author	Sobey, C	en_US
dc.contributor.author	Breton, RP	en_US
dc.contributor.author	Cooper, S	en_US
dc.contributor.author	Falcke, H	en_US
dc.contributor.author	Karastergiou, A	en_US
dc.contributor.author	Michilli, D	en_US
dc.contributor.author	Osłowski, S	en_US
dc.contributor.author	Sanidas, S	en_US
dc.contributor.author	Ter Veen, S	en_US
dc.contributor.author	Van Leeuwen, J	en_US
dc.contributor.author	Verbiest, JPW	en_US
dc.contributor.author	Weltevrede, P	en_US
dc.contributor.author	Zarka, P	en_US
dc.contributor.author	Grießmeier, JM	en_US
dc.contributor.author	Serylak, M	en_US
dc.contributor.author	Bell, ME https://orcid.org/0000-0003-1767-5277	en_US
dc.contributor.author	Broderick, JW	en_US
dc.contributor.author	Eislöffel, J	en_US
dc.contributor.author	Markoff, S	en_US
dc.contributor.author	Rowlinson, A	en_US
dc.date.issued	2016-07-01	en_US
dc.identifier.citation	Astronomy and Astrophysics, 2016, 591	en_US
dc.identifier.issn	0004-6361	en_US
dc.identifier.uri	http://hdl.handle.net/10453/113568
dc.description.abstract	© ESO 2016. We present first results from a LOFAR census of non-recycled pulsars. The census includes almost all such pulsars known (194 sources) at declinations Dec > 8 and Galactic latitudes jGbj > 3, regardless of their expected flux densities and scattering times. Each pulsar was observed for 20 min in the contiguous frequency range of 110-188 MHz. Full-Stokes data were recorded. We present the dispersion measures, flux densities, and calibrated total intensity profiles for the 158 pulsars detected in the sample. The median uncertainty in census dispersion measures (1:5 × 10-3 pc cm-3) is ten times smaller, on average, than in the ATNF pulsar catalogue. We combined census flux densities with those in the literature and fitted the resulting broadband spectra with single or broken power-law functions. For 48 census pulsars such fits are being published for the first time. Typically, the choice between single and broken power-laws, as well as the location of the spectral break, were highly influenced by the spectral coverage of the available flux density measurements. In particular, the inclusion of measurements below 100MHz appears essential for investigating the lowfrequency turnover in the spectra for most of the census pulsars. For several pulsars, we compared the spectral indices from different works and found the typical spread of values to be within 0.5-1.5, suggesting a prevailing underestimation of spectral index errors in the literature. The census observations yielded some unexpected individual source results, as we describe in the paper. Lastly, we will provide this unique sample of wide-band, low-frequency pulse profiles via the European Pulsar Network Database.	en_US
dc.relation.ispartof	Astronomy and Astrophysics	en_US
dc.relation.isbasedon	10.1051/0004-6361/201527702	en_US
dc.subject.classification	Astronomy & Astrophysics	en_US
dc.title	A LOFAR census of non-recycled pulsars: Average profiles, dispersion measures, flux densities, and spectra	en_US
dc.type	Journal Article
utslib.citation.volume	591	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	591	en_US

Abstract:

© ESO 2016. We present first results from a LOFAR census of non-recycled pulsars. The census includes almost all such pulsars known (194 sources) at declinations Dec > 8 and Galactic latitudes jGbj > 3, regardless of their expected flux densities and scattering times. Each pulsar was observed for 20 min in the contiguous frequency range of 110-188 MHz. Full-Stokes data were recorded. We present the dispersion measures, flux densities, and calibrated total intensity profiles for the 158 pulsars detected in the sample. The median uncertainty in census dispersion measures (1:5 × 10-3 pc cm-3) is ten times smaller, on average, than in the ATNF pulsar catalogue. We combined census flux densities with those in the literature and fitted the resulting broadband spectra with single or broken power-law functions. For 48 census pulsars such fits are being published for the first time. Typically, the choice between single and broken power-laws, as well as the location of the spectral break, were highly influenced by the spectral coverage of the available flux density measurements. In particular, the inclusion of measurements below 100MHz appears essential for investigating the lowfrequency turnover in the spectra for most of the census pulsars. For several pulsars, we compared the spectral indices from different works and found the typical spread of values to be within 0.5-1.5, suggesting a prevailing underestimation of spectral index errors in the literature. The census observations yielded some unexpected individual source results, as we describe in the paper. Lastly, we will provide this unique sample of wide-band, low-frequency pulse profiles via the European Pulsar Network Database.

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http://hdl.handle.net/10453/113568