Detection of nonthermal emission from the bow shock of a massive runaway star

Context. The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, ther...

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Detalles Bibliográficos
Autores principales:	Benaglia, Paula, Romero, Gustavo Esteban, Martí, J., Peri, Cintia Soledad, Araudo, Anabella Teresa
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2010
Materias:	Ciencias Astronómicas Infrared: stars Radio continuum: general Stars: early-type Stars: individual: BD+43°3654 Infrared: star
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/82448
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-82448
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 Infrared: stars Radio continuum: general Stars: early-type Stars: individual: BD+43°3654 Infrared: star Stars: early-type
spellingShingle	Ciencias Astronómicas Infrared: stars Radio continuum: general Stars: early-type Stars: individual: BD+43°3654 Infrared: star Stars: early-type Benaglia, Paula Romero, Gustavo Esteban Martí, J. Peri, Cintia Soledad Araudo, Anabella Teresa Detection of nonthermal emission from the bow shock of a massive runaway star
topic_facet	Ciencias Astronómicas Infrared: stars Radio continuum: general Stars: early-type Stars: individual: BD+43°3654 Infrared: star Stars: early-type
description	Context. The environs of massive, early-type stars have been inspected in recent years in the search for sites where particles can be accelerated up to relativistic energies. Wind regions of massive binaries that collide have already been established as sources of high-energy emission; however, there is a different scenario for massive stars where strong shocks can also be produced: the bow-shaped region of matter piled up by the action of the stellar strong wind of a runaway star interacting with the interstellar medium. Aims. We study the bow-shock region produced by a very massive runaway star, BD+43°3654, to look for nonthermal radio emission as evidence of a relativistic particle population. Methods. We observed the field of BD+43°3654 at two frequencies, 1.42 and 4.86 GHz, with the Very Large Array (VLA), and obtained a spectral index map of the radio emission. Results. We have detected, for the first time, nonthermal radio emission from the bow shock of a massive runaway star. Conclusions. After analyzing the radiative mechanisms that can be at work, we conclude that the region under study could produce enough relativistic particles whose radiation might be detectable by forthcoming gamma-ray instruments, like CTA North.
format	Articulo Articulo
author	Benaglia, Paula Romero, Gustavo Esteban Martí, J. Peri, Cintia Soledad Araudo, Anabella Teresa
author_facet	Benaglia, Paula Romero, Gustavo Esteban Martí, J. Peri, Cintia Soledad Araudo, Anabella Teresa
author_sort	Benaglia, Paula
title	Detection of nonthermal emission from the bow shock of a massive runaway star
title_short	Detection of nonthermal emission from the bow shock of a massive runaway star
title_full	Detection of nonthermal emission from the bow shock of a massive runaway star
title_fullStr	Detection of nonthermal emission from the bow shock of a massive runaway star
title_full_unstemmed	Detection of nonthermal emission from the bow shock of a massive runaway star
title_sort	detection of nonthermal emission from the bow shock of a massive runaway star
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/82448
work_keys_str_mv	AT benagliapaula detectionofnonthermalemissionfromthebowshockofamassiverunawaystar AT romerogustavoesteban detectionofnonthermalemissionfromthebowshockofamassiverunawaystar AT martij detectionofnonthermalemissionfromthebowshockofamassiverunawaystar AT pericintiasoledad detectionofnonthermalemissionfromthebowshockofamassiverunawaystar AT araudoanabellateresa detectionofnonthermalemissionfromthebowshockofamassiverunawaystar
bdutipo_str	Repositorios
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Detection of nonthermal emission from the bow shock of a massive runaway star

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