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Radio spectra of millisecond pulsars

Published online by Cambridge University Press:  04 June 2018

Vladislav Kondratiev ,
Anna Bilous  and
LOFAR PWG
Vladislav Kondratiev
Affiliation:
ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands email: [email protected]
Anna Bilous
Affiliation:
Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Abstract

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Both the physics of the pulsar emission mechanism and free-free absorption in the intervening interstellar medium can be tested with the pulsar radio spectra. We have built on our previous work on describing LOFAR population of millisecond pulsars (MSPs; Kondratiev et al. 2016) and HBA census of slow pulsars (Bilous et al. 2016) and present the study of radio spectra of the MSPs with a special attention on the low-frequency turnover. Using LOFAR timing data allowed us to measure flux densities of many MSPs over time span of up to three years in the frequency range 110–188 MHz. This provided more reliable estimates of mean flux densities and spectra reducing the influence of refractive scintillation, ionosphere and other factors on a single flux measurement. Together with published data at other radio frequencies we constructed pulsars’ spectra and fitted them with single or broken power-laws. We discuss the obtained spectra and their fits, paying special attention to the low-frequency turnover, and compare broadband radio spectra of MSPs to those of normal pulsars.

Keywords

pulsars: generalpulsars: individual (J0034–0534J1640+2224B1937+21J2145–0750)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 358 - 359
Copyright
Copyright © International Astronomical Union 2018 

References

Bilous, A. V., Kondratiev, V. I., Kramer, M., et al. 2016, A&A, 591, A134Google Scholar
Kondratiev, V. I., Verbiest, J. P. W., Hessels, J. W. T., et al. 2016, A&A, 585, A128Google Scholar
Kuniyoshi, M., Verbiest, J. P. W., Lee, K. J., et al. 2015, MNRAS, 453, 828Google Scholar