Follow-up of 27 radio-quiet gamma-ray pulsars at 110–190 MHz using the international LOFAR station FR606
| hal.structure.identifier | Laboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E] | |
| hal.structure.identifier | Unité Scientifique de la Station de Nançay [USN] | |
| dc.contributor.author | GRIESSMEIER, Jean-Mathias | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | SMITH, D.A. | |
| hal.structure.identifier | Laboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E] | |
| hal.structure.identifier | Unité Scientifique de la Station de Nançay [USN] | |
| hal.structure.identifier | Laboratoire Univers et Théories [LUTH (UMR_8102)] | |
| dc.contributor.author | THEUREAU, Gilles | |
| dc.contributor.author | JOHNSON, T.J. | |
| dc.contributor.author | KERR, M. | |
| hal.structure.identifier | Laboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E] | |
| hal.structure.identifier | Laboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA (UMR_8109)] | |
| dc.contributor.author | BONDONNEAU, L. | |
| hal.structure.identifier | Laboratoire de Physique et Chimie de l'Environnement et de l'Espace [LPC2E] | |
| hal.structure.identifier | Unité Scientifique de la Station de Nançay [USN] | |
| dc.contributor.author | COGNARD, Ismaël | |
| dc.contributor.author | SERYLAK, M. | |
| dc.date.issued | 2021 | |
| dc.description.abstractEn | Context. The Fermi Large Area Telescope has detected over 260 gamma-ray pulsars. About one quarter of these are labeled as radio-quiet, that is they either have radio flux densities < 30 μJy at 1400 MHz, or they are not detected at all in the radio domain. In the population of nonrecycled gamma-ray pulsars, the fraction of radio-quiet pulsars is higher, about one half.Aims. Most radio observations of gamma-ray pulsars have been performed at frequencies between 300 MHz and 2 GHz. However, pulsar radio fluxes increase rapidly with decreasing frequency, and their radio beams often broaden at low frequencies. As a consequence, some of these pulsars might be detectable at low radio frequencies even when no radio flux is detected above 300 MHz. Our aim is to test this hypothesis with low-frequency radio observations.Methods. We have observed 27 Fermi-discovered gamma-ray pulsars with the international LOw Frequency ARray (LOFAR) station FR606 in single-station mode. We used the LOFAR high band antenna band (110−190 MHz), with an average observing time of 13 h per target. Part of the data had to be discarded due to radio frequency interference. On average, we kept 9 h of observation per target after the removal of affected datasets, resulting in a sensitivity for pulse-averaged flux on the order of 1−10 mJy.Results. We do not detect radio pulsations from any of the 27 sources, and we establish stringent upper limits on their low-frequency radio fluxes. These nondetections are compatible with the upper limits derived from radio observations at other frequencies. We also determine the pulsars’ geometry from the gamma-ray profiles to see for which pulsars the low-frequency radio beam is expected to cross Earth.Conclusions. This set of observations provides the most constraining upper limits on the flux density at 150 MHz for 27 radio-quiet gamma-ray pulsars. In spite of the beam-widening expected at low radio frequencies, most of our nondetections can be explained by an unfavorable viewing geometry; for the remaining observations, especially those of pulsars detected at higher frequencies, the nondetection is compatible with insufficient sensitivity.Key words: pulsars: general / telescopes / ISM: general | |
| dc.language.iso | en | |
| dc.subject.en | pulsars: general | |
| dc.subject.en | telescopes | |
| dc.subject.en | ISM: general | |
| dc.title.en | Follow-up of 27 radio-quiet gamma-ray pulsars at 110–190 MHz using the international LOFAR station FR606 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/202140841 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.subject.hal | Planète et Univers [physics] | |
| dc.identifier.arxiv | 2108.01749 | |
| bordeaux.journal | Astron.Astrophys. | |
| bordeaux.page | A43 | |
| bordeaux.volume | 654 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03321383 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03321383v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astron.Astrophys.&rft.date=2021&rft.volume=654&rft.spage=A43&rft.epage=A43&rft.au=GRIESSMEIER,%20Jean-Mathias&SMITH,%20D.A.&THEUREAU,%20Gilles&JOHNSON,%20T.J.&KERR,%20M.&rft.genre=article |
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