Is the stellar system WR11 a gamma-ray source?

Many early-type stars are in systems; some of them have been indicated as putative high-energy emitters. The radiationwould be produced at the region where two stellar winds collide. Compelling evidence of such emission was found only for the colliding-wind binary (CWB) Eta Car, which was associated...

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Detalles Bibliográficos
Autor principal: Benaglia, Paula
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
Radio continuum: stars
Stars: individual: WR 11
Stars: winds, outflows
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/102078
https://ri.conicet.gov.ar/11336/24341
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=10294057&fulltextType=RA&fileId=S132335801600014X
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-102078
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Radio continuum: stars
Stars: individual: WR 11
Stars: winds, outflows
spellingShingle Ciencias Astronómicas
Radio continuum: stars
Stars: individual: WR 11
Stars: winds, outflows
Benaglia, Paula
Is the stellar system WR11 a gamma-ray source?
topic_facet Ciencias Astronómicas
Radio continuum: stars
Stars: individual: WR 11
Stars: winds, outflows
description Many early-type stars are in systems; some of them have been indicated as putative high-energy emitters. The radiationwould be produced at the region where two stellar winds collide. Compelling evidence of such emission was found only for the colliding-wind binary (CWB) Eta Car, which was associated to a GeV source. Very recently, the closest CWB, WR 11, was proposed as a counterpart of a 6σ emission excess, measured with the Fermi LAT satellite. We sought evidence to support or reject the hypothesis that WR 11 is responsible of the gamma-ray excess. Archive radio interferometric data at 1.4 and 2.5 GHz taken with the Australia Telescope Compact Array along 16 dates were reduced. The sizes of the field-of-view at 2.5 GHz and of the central region of the Fermi LAT excess are alike. We analysed the emission of the WR 11 field, characterised the radio sources detected and derived their spectral indices, to investigate their nature. Eight sources with fluxes above 10 mJy were detected at both frequencies. All but one (WR 11) showed negative spectral indices. Four of them were identified with known objects, including WR 11. A fifth source, labeled here S6, is a promising candidate to produce gamma-ray emission, besides the CWB WR 11.
format Articulo
Preprint
author Benaglia, Paula
author_facet Benaglia, Paula
author_sort Benaglia, Paula
title Is the stellar system WR11 a gamma-ray source?
title_short Is the stellar system WR11 a gamma-ray source?
title_full Is the stellar system WR11 a gamma-ray source?
title_fullStr Is the stellar system WR11 a gamma-ray source?
title_full_unstemmed Is the stellar system WR11 a gamma-ray source?
title_sort is the stellar system wr11 a gamma-ray source?
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/102078
https://ri.conicet.gov.ar/11336/24341
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=10294057&fulltextType=RA&fileId=S132335801600014X
work_keys_str_mv AT benagliapaula isthestellarsystemwr11agammaraysource
bdutipo_str Repositorios
_version_ 1764820440756256768

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