A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known

Agar CH, Weltevrede P, Bondonneau L, Grießmeier J-M, Hessels JWT, Huang WJ, Karastergiou A, Keith MJ, Kondratiev VI, Künsemöller J, Li D, et al. (2021)
Monthly Notices of the Royal Astronomical Society 508(1): 1102-1114.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Agar, C H; Weltevrede, P; Bondonneau, L; Grießmeier, J-M; Hessels, J W T; Huang, W J; Karastergiou, A; Keith, M J; Kondratiev, V I; Künsemöller, JörnUniBi; Li, D; Peng, B
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Abstract / Bemerkung
**ABSTRACT**
We present radio observations of the most slowly rotating known radio pulsar PSR J0250+5854. With a 23.5-s period, it is close, or even beyond, the P-$\dot{P}$ diagram region thought to be occupied by active pulsars. The simultaneous observations with the Five-hundred-metre Aperture Spherical radio Telescope (FAST), the Chilbolton and Effelsberg Low Frequency Array (LOFAR) international stations, and New Extension in Nançay Upgrading loFAR (NenuFAR) represent a five-fold increase in the spectral coverage of this object, with the detections at 1250 (FAST) and 57 MHz (NenuFAR) being the highest and lowest frequency published, respectively, to date. We measure a flux density of 4 ± 2 $\mu$Jy at 1250 MHz and an exceptionally steep spectral index of $-3.5^{+0.2}_{-1.5}$, with a turnover below ∼95 MHz. In conjunction with observations of this pulsar with the Green Bank Telescope and the LOFAR Core, we show that the intrinsic profile width increases drastically towards higher frequencies, contrary to the predictions of conventional radius-to-frequency mapping. We examine polarimetric data from FAST and the LOFAR Core and conclude that its polar cap radio emission is produced at an absolute height of several hundreds of kilometres around 1.5 GHz, similar to other rotation-powered pulsars across the population. Its beam is significantly underfilled at lower frequencies, or it narrows because of the disappearance of conal outriders. Finally, the results for PSR J0250+5854 and other slowly spinning rotation-powered pulsars are contrasted with the radio-detected magnetars. We conclude that magnetars have intrinsically wider radio beams than the slow rotation-powered pulsars, and that consequently the latter’s lower beaming fraction is what makes objects such as PSR J0250+5854 so scarce.
Erscheinungsjahr
2021
Zeitschriftentitel
Monthly Notices of the Royal Astronomical Society
Band
508
Ausgabe
1
Seite(n)
1102-1114
ISSN
0035-8711
eISSN
1365-2966
Page URI
https://pub.uni-bielefeld.de/record/2958514

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Agar CH, Weltevrede P, Bondonneau L, et al. A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known. Monthly Notices of the Royal Astronomical Society. 2021;508(1):1102-1114.
Agar, C. H., Weltevrede, P., Bondonneau, L., Grießmeier, J. - M., Hessels, J. W. T., Huang, W. J., Karastergiou, A., et al. (2021). A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known. Monthly Notices of the Royal Astronomical Society, 508(1), 1102-1114. https://doi.org/10.1093/mnras/stab2496
Agar, C. H., Weltevrede, P., Bondonneau, L., Grießmeier, J. - M., Hessels, J. W. T., Huang, W. J., Karastergiou, A., Keith, M. J., Kondratiev, V. I., Künsemöller, J., et al. (2021). A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known. Monthly Notices of the Royal Astronomical Society 508, 1102-1114.
Agar, C.H., et al., 2021. A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known. Monthly Notices of the Royal Astronomical Society, 508(1), p 1102-1114.
C.H. Agar, et al., “A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known”, Monthly Notices of the Royal Astronomical Society, vol. 508, 2021, pp. 1102-1114.
Agar, C.H., Weltevrede, P., Bondonneau, L., Grießmeier, J.-M., Hessels, J.W.T., Huang, W.J., Karastergiou, A., Keith, M.J., Kondratiev, V.I., Künsemöller, J., Li, D., Peng, B., Sobey, C., Stappers, B.W., Tan, C.M., Theureau, G., Wang, H.G., Zhang, C.M., Cecconi, B., Girard, J.N., Loh, A., Zarka, P.: A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known. Monthly Notices of the Royal Astronomical Society. 508, 1102-1114 (2021).
Agar, C H, Weltevrede, P, Bondonneau, L, Grießmeier, J-M, Hessels, J W T, Huang, W J, Karastergiou, A, Keith, M J, Kondratiev, V I, Künsemöller, Jörn, Li, D, Peng, B, Sobey, C, Stappers, B W, Tan, C M, Theureau, G, Wang, H G, Zhang, C M, Cecconi, B, Girard, J N, Loh, A, and Zarka, P. “A broad-band radio study of PSR J0250+5854: the slowest spinning radio pulsar known”. Monthly Notices of the Royal Astronomical Society 508.1 (2021): 1102-1114.

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