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Time variation in the low-frequency spectrum of Vela-like pulsar B1800-21

Basu, Rahul and Rożko, Karolina and Lewandowski, Wojciech and Kijak, Jarosław; and Dembska, Marta (2016) Time variation in the low-frequency spectrum of Vela-like pulsar B1800-21. Monthly Notices of the Royal Astronomical Society, 458 (3), pp. 2509-2515. Oxford University Press. DOI: 10.1093/mnras/stw394 ISSN 0035-8711

Full text not available from this repository.

Abstract

We report the flux measurement of the Vela-like pulsar B1800−21 at the low radio frequency regime over multiple epochs spanning several years. The spectrum shows a turnover around the GHz frequency range and represents a typical example of gigahertz-peaked spectrum (GPS) pulsar. Our observations revealed that the pulsar spectrum show a significant evolution during the observing period with the low-frequency part of the spectrum becoming steeper, with a higher turnover frequency, for a period of several years before reverting back to the initial shape during the latest measurements. The spectral change over times spanning several years requires dense structures, with free electron densities around 1000–20 000 cm−3 and physical dimensions ∼220 au, in the interstellar medium (ISM) traversing across the pulsar line of sight. We look into the possible sites of such structures in the ISM and likely mechanisms particularly the thermal free–free absorption as possible explanations for the change.

Item URL in elib:https://elib.dlr.de/120670/
Document Type:Article
Title:Time variation in the low-frequency spectrum of Vela-like pulsar B1800-21
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Basu, RahulJanusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Rożko, KarolinaJanusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Lewandowski, WojciechJanusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Kijak, Jarosław;Janusz Gil Institute of Astronomy, University of Zielona Góra, Zielona Góra, PolandUNSPECIFIED
Dembska, MartaMarta.Dembska (at) dlr.deUNSPECIFIED
Date:19 February 2016
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:458
DOI :10.1093/mnras/stw394
Page Range:pp. 2509-2515
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:pulsars: general, pulsars: individual: B1800−21
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Komplexe Plasmen / Data analysis
Location: Berlin-Adlershof , Bremen
Institutes and Institutions:Institute of Space Systems > Mechanic and Thermal Systems
Institute of Optical Sensor Systems > Optics, Calibration and Validation
Deposited By: Dembska, Marta
Deposited On:09 Jul 2018 08:57
Last Modified:06 Sep 2019 15:17

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