Low radio frequency detections of known pulsars and identification of new candidates with GLEAM-X: GP

Abstract

Image-based searches have become a complementary approach for identifying pulsars, particularly at MHz frequencies where scattering and high dispersion measures affect high-time resolution observations. In this work, we searched the Galactic Plane (GP) data release from the GaLactic and Extragalactic All-Sky Murchison Widefield Array eXtended (GLEAM-X) survey, a widefield continuum radio survey covering the 72 - 231 MHz frequency range, at the positions of known pulsars in the ATNF catalogue (version 2.6.2) that lie within its sky coverage. We present the spectral energy distribution for 193 known pulsars located at |b| < 11deg. Notably, 106 of these represent the first detections below 400 MHz. We also cross-match the GLEAM-X: GP compact source catalogue with unassociated sources in the Fermi Large Area Telescope (LAT) catalogue, filtering for gamma-ray spectral and variability properties, as well as coincidence with Active Galactic Nuclei (AGN). We have identified 106 possible pulsar candidates. This work demonstrates the importance of sensitive, low-frequency Galactic plane surveys for detecting emission from known pulsars and presents a potential way of searching for new pulsar candidates that would otherwise be missed by traditional time-domain searches.

arXiv commentAccepted for publication in Monthly Notices of the Royal Astronomical Society. 11 pages, 9 figures, 2 tables

References in corpus (37)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• The ATNF Pulsar Catalogue
• The SIMBAD astronomical database
• Fermi Large Area Telescope Fourth Source Catalog
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• Preliminary Results from NEOWISE: An Enhancement to the Wide-field Infrared Survey Explorer for Solar System Science
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Multifrequency Observations of Radio Pulse Broadening and Constraints on Interstellar Electron Density Microstructure
• GLEAM: The GaLactic and Extragalactic All-sky MWA survey
• The Phase II Murchison Widefield Array: Design Overview
• Spectral properties of 441 radio pulsars
• The pulsar spectral index distribution
• A LOFAR census of non-recycled pulsars: average profiles, dispersion measures, flux densities, and spectra
• Classification and Ranking of Fermi LAT Gamma-ray Sources from the 3FGL Catalog using Machine Learning Techniques
• Scattering analysis of LOFAR pulsar observations
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey II: Galactic Plane $345^{\circ }<l<67^{\circ }$, $180^{\circ }<l<240^{\circ }$
• Spectral Index of the Diffuse Radio Background Between 50 and 100 MHz
• Fermi Large Area Telescope Fourth Source Catalog Data Release 4 (4FGL-DR4)
• An image-based search for pulsars among Fermi unassociated LAT sources
• Known Pulsars Identified in the GMRT 150 MHz All-Sky Survey
• The TRAPUM L-band survey for pulsars in Fermi-LAT gamma-ray sources
• Low-Frequency Spectral Turn-Overs in Millisecond Pulsars Studied from Imaging Observations
• Low frequency spectral energy distributions of radio pulsars detected with the Murchison Widefield Array
• Detecting Pulsars with Interstellar Scintillation in Variance Images
• Radio Pulsars
• A southern-sky total intensity source catalogue at 2.3 GHz from S-band Polarisation All-Sky Survey data
• pulsar_spectra: A pulsar flux density catalogue and spectrum fitting repository
• Pulsar Candidates Toward Fermi Unassociated Sources
• Discovery of a steep-spectrum low-luminosity pulsar with the Murchison Widefield Array
• A Determination of the Gamma-ray Flux and Photon Spectral Index Distributions of Blazars from the Fermi-LAT 3LAC
• Classifications of Fermi-LAT unassociated sources in multiple machine learning methods
• Topology of Pulsar Profiles (ToPP). I. Graph theory method and classification of the EPN
• GaLactic and Extragalactic All-sky Murchison Widefield Array eXtended (GLEAM-X) survey II: Second Data Release
• Imaging pulsar census of the Galactic Plane using MWA VCS data