Flux density measurements of GPS candidate pulsars at 610 MHz using interferometric imaging technique

Abstract

We conducted radio interferometric observations of six pulsars at 610 MHz using the Giant Metrewave Radio Telescope (GMRT). All these objects were claimed or suspected to be the gigahertz-peaked spectra (GPS) pulsars. For a half of the sources in our sample the interferometric imaging provides the only means to estimate their flux at 610 MHz due to a strong pulse scatter-broadening. In our case, these pulsars have very high dispersion measure values and we present their spectra containing for the first time low-frequency measurements. The remaining three pulsars were observed at low frequencies using the conventional pulsar flux measurement method. The interferometric imaging technique allowed us to re-examine their fluxes at 610 MHz. We were able to confirm the GPS feature in the PSR B1823$-$13 spectrum and select a GPS candidate pulsar. These results clearly demonstrate that the interferometric imaging technique can be successfully applied to estimate flux density of pulsars even in the presence of strong scattering.

arXiv comment7 pages, 3 tables, 5 figures, accepted for publication in MNRAS

References in corpus (18)

• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• The H.E.S.S. survey of the Inner Galaxy in very high-energy gamma-rays
• Multifrequency Observations of Radio Pulse Broadening and Constraints on Interstellar Electron Density Microstructure
• A new population of very high energy gamma-ray sources in the Milky Way
• Pulsar spectra of radio emission
• The pulsar spectral index distribution
• The Einstein@Home search for radio pulsars and PSR J2007+2722 discovery
• Pulsars with gigahertz-peaked spectra
• Pulse broadening analysis for several new pulsars and anomalous scattering
• Turn-over in pulsar spectra around 1 GHz
• Flux-density spectral analysis for several pulsars and two newly-identified gigahertz-peaked spectra
• Spectrum evolution in binary pulsar B1259-63/LS 2883 Be star and gigahertz-peaked spectra
• Do radio magnetars J1550-5418 and J1622-4950 have gigahertz-peaked spectra?
• Detection of off-pulse emission from PSR B0525+21 and PSR B2045-16
• Pulsars in the Westerbork Northern Sky Survey
• On the nature of Off-pulse emission from pulsars
• Observation of Very High Energy Gamma Rays from HESS J1804-216 with CANGAROO-III Telescopes

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• Meterwavelength Single-pulse Polarimetric Emission Survey. V. Flux density, component spectral variation and emission states
• Gigahertz-peaked spectra pulsars in Pulsar Wind Nebulae
• Multi-frequency observations and spectral analysis of two gigahertz-peaked spectra pulsars
• The uGMRT observations of three new GPS pulsars
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