INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars

Aims. We analyze INTEGRAL-ISGRI data in order to probe the hard X-ray emission (above 20 keV) from point sources in the Cyg OB2 region and to investigate the putative non-thermal high-energy emission from early-type stars (Wolf-Rayet and O-type stars). Among the targets located in the field of view,...

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Autores principales: De Becker, M., Rauw, G., Pittard, J. M., Sana, H., Stevens, I. R., Romero, Gisela Andrea
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Astronómicas
Acceleration of particles
Gamma rays: observations
Radiation mechanisms: non-thermal
Stars: early-type
X-rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83012
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83012
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
Acceleration of particles
Gamma rays: observations
Radiation mechanisms: non-thermal
Stars: early-type
X-rays: stars
spellingShingle Ciencias Astronómicas
Acceleration of particles
Gamma rays: observations
Radiation mechanisms: non-thermal
Stars: early-type
X-rays: stars
De Becker, M.
Rauw, G.
Pittard, J. M.
Sana, H.
Stevens, I. R.
Romero, Gisela Andrea
INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
topic_facet Ciencias Astronómicas
Acceleration of particles
Gamma rays: observations
Radiation mechanisms: non-thermal
Stars: early-type
X-rays: stars
description Aims. We analyze INTEGRAL-ISGRI data in order to probe the hard X-ray emission (above 20 keV) from point sources in the Cyg OB2 region and to investigate the putative non-thermal high-energy emission from early-type stars (Wolf-Rayet and O-type stars). Among the targets located in the field of view, we focus on the still unidentified EGRET source 3EG 2033+4118 that may be related to massive stars known to produce non-thermal emission in the radio domain, and on the wide colliding-wind binary WR 140. Methods. Using a large set of data obtained with the IBIS-ISGRI imager onboard INTEGRAL, we run the OSA software package in order to find point sources in the fully coded field of view of the instrument. Results. Our data do not allow the detection of a lower-energy counterpart of 3EG J2033+4118 nor of any other new point sources in the field of view, and we derive upper limits on the high-energy flux for a few targets: 3EG J2033+4118, TeV J2032+4130, WR 140, WR 146 and WR 147. The results are discussed in the context of the multiwavelength investigation of these objects. Conclusions. The upper limits derived are valuable constraints for models aimed at understanding the acceleration of particles in non-thermal emitting massive stars, and of the still unidentified very-high gamma-ray source TeV J2032+4130.
format Articulo
Articulo
author De Becker, M.
Rauw, G.
Pittard, J. M.
Sana, H.
Stevens, I. R.
Romero, Gisela Andrea
author_facet De Becker, M.
Rauw, G.
Pittard, J. M.
Sana, H.
Stevens, I. R.
Romero, Gisela Andrea
author_sort De Becker, M.
title INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
title_short INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
title_full INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
title_fullStr INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
title_full_unstemmed INTEGRAL-ISGRI observations of the Cygnus OB2 region: Searching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
title_sort integral-isgri observations of the cygnus ob2 region: searching for hard x-ray point sources in a region containing several non-thermal emitting massive stars
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83012
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