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J/MNRAS/473/4436    Spectral properties of 441 radio pulsars (Jankowski+, 2018)

Spectral properties of 441 radio pulsars. Jankowski F., Van Straten W., Keane E.F., Bailes M., Barr E.D., Johnston S., Kerr M. <Mon. Not. R. Astron. Soc., 473, 4436-4458 (2018)> =2018MNRAS.473.4436J (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Pulsars ; Radio continuum ; Radio sources ; Spectral types Keywords: radiation mechanisms: non-thermal - methods: data analysis - pulsars: general - radio continuum: stars Abstract: We present a study of the spectral properties of 441 pulsars observed with the Parkes radio telescope near the centre frequencies of 728, 1382 and 3100MHz. The observations at 728 and 3100MHz were conducted simultaneously using the dual-band 10-50cm receiver. These high-sensitivity, multifrequency observations provide a systematic and uniform sample of pulsar flux densities. We combine our measurements with spectral data from the literature in order to derive the spectral properties of these pulsars. Using techniques from robust regression and information theory, we classify the observed spectra in an objective, robust and unbiased way into five morphological classes: simple or broken power law, power law with either low- or high-frequency cut-off and log-parabolic spectrum. While about 79 per cent of the pulsars that could be classified have simple power-law spectra, we find significant deviations in 73 pulsars, 35 of which have curved spectra, 25 with a spectral break and 10 with a low-frequency turn-over. We identify 11 gigahertz-peaked spectrum (GPS) pulsars, with 3 newly identified in this work and 8 confirmations of known GPS pulsars; 3 others show tentative evidence of GPS, but require further low-frequency measurements to support this classification. The weighted mean spectral index of all pulsars with simple power-law spectra is -1.60±0.03. The observed spectral indices are well described by a shifted log-normal distribution. The strongest correlations of spectral index are with spin-down luminosity, magnetic field at the light-cylinder and spin-down rate. We also investigate the physical origin of the observed spectral features and determine emission altitudes for three pulsars. Description: We present spectral parameters for 441 radio pulsars. These were obtained from observations centred at 728, 1382 and 3100MHz using the 10-50cm and the 20cm multibeam receiver at the Parkes radio telescope. In particular, we list the pulsar names (J2000), the calibrated, band-integrated flux densities at 728, 1382 and 3100MHz, the spectral classifications, the frequency ranges the spectral classifications were performed over, the spectral indices for pulsars with simple power-law spectra and the robust modulation indices at all three centre frequencies for pulsars of which we have at least six measurement epochs. The flux density uncertainties include scintillation and a systematic contribution, in addition to the statistical uncertainty. Upper limits are reported at the 3σ level and all other uncertainties at the 1σ level. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablec1.dat 146 441 Spectral parameters for 441 radio pulsars
Byte-by-byte Description of file: tablec1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- PSRJ Pulsar name (J2000) (JHHMM+DDMMA) 13 A1 --- l_S728 ? Limit flag on S728 14- 20 F7.2 mJy S728 ? Flux density at 728MHz 22- 27 F6.2 mJy e_S728 ? Uncertainty of flux density at 728MHz 29 A1 --- l_S1382 ? Limit flag on S1382 30- 37 F8.3 mJy S1382 ? Flux density at 1382MHz 39- 44 F6.3 mJy e_S1382 ? Uncertainty of flux density at 1382MHz 46 A1 --- l_S3100 ? Limit flag on S3100 47- 53 F7.3 mJy S3100 ? Flux density at 3100MHz 55- 60 F6.3 mJy e_S3100 ? Uncertainty of flux density at 3100MHz 62- 74 A13 --- Class ? Spectral classification of pulsar 76- 79 F4.2 GHz nu-start Frequency range start for classification 81- 84 F4.1 GHz nu-end Frequency range end for classification 86- 90 F5.2 --- alpha ? Spectral index for simple pl spectra 92- 95 F4.2 --- e_alpha ? Uncertainty of spectral index 97-100 F4.2 --- m728 ? Robust modulation index at 728MHz 102-105 F4.2 --- e_m728 ? Low uncertainty on m728 107-110 F4.2 --- E_m728 ? High uncertainty on m728 112-116 F5.3 --- m1382 ? Robust modulation index at 1382MHz 118-122 F5.3 --- e_m1382 ? Low uncertainty on m1382 124-128 F5.3 --- E_m1382 ? High uncertainty on m1382 130-134 F5.3 --- m3100 ? Robust modulation index at 3100MHz 136-140 F5.3 --- e_m3100 ? Low uncertainty on m3100 142-146 F5.3 --- E_m3100 ? High uncertainty on m3100
Acknowledgements: Fabian Jankowski, fjankowsk at
(End) F. Jankowski [Manchester Univ., UK], P. Vannier [CDS] 29-Mar-2018
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