LOFAR census of pulsars at low frequencies

DOI

To date, only 69 pulsars have been identified with a detected pulsed radio emission below 100MHz. A LOFAR-core LBA census and a dedicated campaign with the Nancay LOFAR station in stand-alone mode were carried out in the years 2014-2017 in order to extend the known population in this frequency range. In this paper, we aim to extend the sample of known radio pulsars at low frequencies and to produce a catalogue in the frequency range of 25-80 MHz. This will allow future studies to probe the local Galactic pulsar population, in addition to helping explain their emission mechanism, better characterising the low-frequency turnover in their spectra, and obtaining new information about the interstellar medium through the study of dispersion, scattering, and scintillation. We observed 102 pulsars that are known to emit radio pulses below 200MHz and with declination above -30{deg}. We used the the Low Band Antennas (LBA) of the LOw Frequency ARray (LOFAR) international station FR606 at the Nancay Radio Observatory in stand-alone mode, recording data between 25-80MHz. Out of our sample of 102 pulsars, we detected 64. We confirmed the existence of ten pulsars detected below 100 MHz by the LOFAR LBA census for the first time (Bilous et al., 2019, submitted) and we added two more pulsars that had never before been detected in this frequency range. We provided average pulse profiles, DM values, and mean flux densities (or upper limits in the case of non-detections). The comparison with previously published results allows us to identify a hitherto unknown spectral turnover for five pulsars, confirming the expectation that spectral turnovers are a widespread phenomenon.

Cone search capability for table J/A+A/635/A76/table1 (Pulsars detected in this census)

Cone search capability for table J/A+A/635/A76/tablea1 (Pulsars that were not detected in this census.)

Identifier
DOI http://doi.org/10.26093/cds/vizier.36350076
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/635/A76
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/635/A76
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/635/A76
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/A+A/635/A76
Provenance
Creator Bondonneau L.; Griessmeier J.-M.; Theureau G.; Bilous A.V.,Kondratiev V.I.; Serylak M.; Keith M.J.; Lyne A.G.
Publisher CDS
Publication Year 2020
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysical Processes; Astrophysics and Astronomy; Cosmology; Natural Sciences; Physics; Stellar Astronomy