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/ | ||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||
Title: | Gigahertz-peaked Spectra Pulsars and Thermal Absorption Model | ||||||||||||||||||||
Authors: |
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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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