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Gigahertz-peaked Spectra Pulsars and Thermal Absorption Model

Kijak, J. and Basu, R. and Rożko, K. and Dembska, Marta (2017) Gigahertz-peaked Spectra Pulsars and Thermal Absorption Model. The Astrophysical Journal, 840 (2). American Astronomical Society. DOI: 10.3847/1538-4357/aa6ff2 ISSN 0004-637X

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Abstract

We present the results of our radio interferometric observations of pulsars at 325 and 610 MHz using the Giant Metrewave Radio Telescope. We used the imaging method to estimate the flux densities of several pulsars at these radio frequencies. The analysis of the shapes of the pulsar spectra allowed us to identify five new gigahertz-peaked spectra (GPS) pulsars. Using the hypothesis that the spectral turnovers are caused by thermal free–free absorption in the interstellar medium, we modeled the spectra of all known objects of this kind. Using the model, we were able to put some observational constraints on the physical parameters of the absorbing matter, which allows us to distinguish between the possible sources of absorption. We also discuss the possible effects of the existence of GPS pulsars on future search surveys, showing that the optimal frequency range for finding such objects would be from a few GHz (for regular GPS sources) to possibly 10 GHz for pulsars and radio magnetars exhibiting very strong absorption.

Item URL in elib:https://elib.dlr.de/120669/
Document Type:Article
Title:Gigahertz-peaked Spectra Pulsars and Thermal Absorption Model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kijak, J.Janusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Basu, R.Janusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Rożko, K.Janusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Dembska, MartaMarta.Dembska (at) dlr.deUNSPECIFIED
Date:15 May 2017
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:840
DOI :10.3847/1538-4357/aa6ff2
Publisher:American Astronomical Society
ISSN:0004-637X
Status:Published
Keywords:ISM: general, ISM: supernova remnants, pulsars: general, stars: winds, outflows
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Berlin-Adlershof , Bremen
Institutes and Institutions:Institute of Optical Sensor Systems > Optics, Calibration and Validation
Institute of Space Systems > Mechanic and Thermal Systems
Deposited By: Dembska, Marta
Deposited On:09 Jul 2018 08:57
Last Modified:06 Sep 2019 15:30

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