Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR

LS I +61 303 is a gamma-ray binary that exhibits an outburst at GHz frequencies each orbital cycle of 26.5 d and a superorbital modulation with a period of 4.6 yr. We have performed a detailed study of the low-frequency radio emission of LS I +61 303 by analyzing all the archival GMRT data at 150, 2...

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Detalles Bibliográficos
Autores principales: Marcote, Benito, Ribó, Marc, Paredes, Joshi, Ishwara-Chandra, C. H., Swinban, John, Broderick, Jess
Formato: Objeto de conferencia
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
GMRT
LOFAR
low-frequency radio emission
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/168113
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-168113
record_format dspace
spelling I19-R120-10915-1681132024-07-29T20:01:59Z http://sedici.unlp.edu.ar/handle/10915/168113 Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR Marcote, Benito Ribó, Marc Paredes, Joshi Ishwara-Chandra, C. H. Swinban, John Broderick, Jess 2015-10 2016 2024-07-29T16:20:35Z en Ciencias Astronómicas GMRT LOFAR low-frequency radio emission LS I +61 303 is a gamma-ray binary that exhibits an outburst at GHz frequencies each orbital cycle of 26.5 d and a superorbital modulation with a period of 4.6 yr. We have performed a detailed study of the low-frequency radio emission of LS I +61 303 by analyzing all the archival GMRT data at 150, 235 and 610 MHz and conducting regular LOFAR observations within the Radio Sky Monitor at 150 MHz. We have detected the source for the first time at 150 MHz, which is also the first detection of a gamma-ray binary at such low frequency. We have obtained the light-curves of the source at 150, 235 and 610 MHz, showing orbital and superorbital modulation. A comparison with contemporaneous RT and OVRO 15-GHz observations shows remarkable differences. At 15 GHz we see clear outbursts, whereas at low frequencies we observe variability with wider maxima. The light-curve at 235 MHz seems to be uncorrelated with the one at 610 MHz. We model the shifts between the maxima at different frequencies as due to changes in the physical parameters of the emitting region assuming either free-free absorption or synchrotron self-absorption, obtaining subrelativistic expansion velocities which are close to the stellar wind velocity for some of the cases. La lista completa de autores que integran el documento puede consultarse en el archivo. Facultad de Ciencias Astronómicas y Geofísicas Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 163-166
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
GMRT
LOFAR
low-frequency radio emission
spellingShingle Ciencias Astronómicas
GMRT
LOFAR
low-frequency radio emission
Marcote, Benito
Ribó, Marc
Paredes, Joshi
Ishwara-Chandra, C. H.
Swinban, John
Broderick, Jess
Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
topic_facet Ciencias Astronómicas
GMRT
LOFAR
low-frequency radio emission
description LS I +61 303 is a gamma-ray binary that exhibits an outburst at GHz frequencies each orbital cycle of 26.5 d and a superorbital modulation with a period of 4.6 yr. We have performed a detailed study of the low-frequency radio emission of LS I +61 303 by analyzing all the archival GMRT data at 150, 235 and 610 MHz and conducting regular LOFAR observations within the Radio Sky Monitor at 150 MHz. We have detected the source for the first time at 150 MHz, which is also the first detection of a gamma-ray binary at such low frequency. We have obtained the light-curves of the source at 150, 235 and 610 MHz, showing orbital and superorbital modulation. A comparison with contemporaneous RT and OVRO 15-GHz observations shows remarkable differences. At 15 GHz we see clear outbursts, whereas at low frequencies we observe variability with wider maxima. The light-curve at 235 MHz seems to be uncorrelated with the one at 610 MHz. We model the shifts between the maxima at different frequencies as due to changes in the physical parameters of the emitting region assuming either free-free absorption or synchrotron self-absorption, obtaining subrelativistic expansion velocities which are close to the stellar wind velocity for some of the cases.
format Objeto de conferencia
Objeto de conferencia
author Marcote, Benito
Ribó, Marc
Paredes, Joshi
Ishwara-Chandra, C. H.
Swinban, John
Broderick, Jess
author_facet Marcote, Benito
Ribó, Marc
Paredes, Joshi
Ishwara-Chandra, C. H.
Swinban, John
Broderick, Jess
author_sort Marcote, Benito
title Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
title_short Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
title_full Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
title_fullStr Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
title_full_unstemmed Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
title_sort orbital and superorbital variability of ls i +61 303 at low radio frequencies with gmrt and lofar
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/168113
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AT swinbanjohn orbitalandsuperorbitalvariabilityoflsi61303atlowradiofrequencieswithgmrtandlofar
AT broderickjess orbitalandsuperorbitalvariabilityoflsi61303atlowradiofrequencieswithgmrtandlofar
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