Low-frequency Flux Density Measurements and Pulsars with GHz-peaked Spectra

We have estimated flux densities of several pulsars from radio interferometric observations mainly at 325 MHz using the Giant Metrewave Radio Telescope. The new observations allowed us to update the spectral nature of the observed pulsars, and in six sources we identified relatively high frequency t...

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Bibliographic Details
Published in:The Astrophysical journal 2021-12, Vol.923 (2), p.211
Main Authors: Kijak, J., Basu, R., Lewandowski, W., Rożko, K.
Format: Article
Language:English
Subjects:
Absorption
Astrophysics
Flux density
H II regions
Interferometric observation
Interstellar matter
Interstellar medium
Nebulae
Parameter identification
Physical properties
Pulsar winds
Pulsars
Radio pulsars
Radio telescopes
Spectra
Stellar winds
Supernova
Supernova remnants
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Summary:We have estimated flux densities of several pulsars from radio interferometric observations mainly at 325 MHz using the Giant Metrewave Radio Telescope. The new observations allowed us to update the spectral nature of the observed pulsars, and in six sources we identified relatively high frequency turnovers, which can be classified as new GHz-peaked spectrum (GPS) pulsars. For such objects the turnover in the spectrum is most likely caused by absorption in the immediate vicinity of the pulsar (or in the interstellar medium). We modeled the turnover spectra using the thermal free–free absorption model and the physical parameters obtained from the fits enabled us to identify the environments that could potentially be responsible for the observed absorption, such as pulsar wind nebulae, supernova remnant nebulae or H ii regions. The discovery of 6 new GPS pulsars brings the total number of such objects to 33 and we discuss the properties of the entire sample.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac3082