Discovery of a variable X-ray counterpart to HESS J1832−093: a new gamma-ray binary?
| dc.contributor.author | EGER, P. | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | LAFFON, H. | |
| dc.contributor.author | BORDAS, P. | |
| dc.contributor.author | DE OÑA WHILHELMI, E. | |
| dc.contributor.author | HINTON, J. | |
| dc.contributor.author | PÜHLHOFER, G. | |
| dc.date.issued | 2016 | |
| dc.identifier.issn | 0035-8711 | |
| dc.description.abstractEn | The TeV gamma-ray point source HESS J1832−093 remains unidentified despite extensive multiwavelength studies. The gamma-ray emission could originate in a very compact pulsar wind nebula or an X-ray binary system composed of the X-ray source XMMU J183245−0921539, and a companion star (2MASS J18324516−0921545). To unveil the nature of XMMU J183245−0921539 and its relation to HESS J1832−093, we performed deeper follow-up observations in X-rays with Chandra and Swift to improve source localization and to investigate time variability. We observed an increase of the X-ray flux by a factor of ∼6 in the Chandra data compared to previous observations. The source is point-like for Chandra and its updated position is only 0.3 arcsec offset from 2MASS J18324516−0921545, confirming the association with this infrared source. Subsequent Swift target of opportunity observations resulted in a lower flux, again compatible with the one previously measured with XMM–Newton, indicating a variability time-scale of the order of two months or shorter. The now-established association of XMMU J183245−0921539 and 2MASS J18324516−0921545, and the observed variability in X-rays are strong evidence for binary nature of HESS J1832−093. Furthermore, observations to characterize the optical counterpart as well as to search for orbital periodicity are needed to confirm this scenario. | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
| dc.subject.en | acceleration of particles | |
| dc.subject.en | radiation mechanisms: non-thermal | |
| dc.subject.en | gamma-rays: general | |
| dc.subject.en | X-rays: binaries | |
| dc.title.en | Discovery of a variable X-ray counterpart to HESS J1832−093: a new gamma-ray binary? | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1093/mnras/stw125 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1601.03208 | |
| bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
| bordeaux.page | 1753-1758 | |
| bordeaux.volume | 457 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03623097 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03623097v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2016&rft.volume=457&rft.issue=2&rft.spage=1753-1758&rft.epage=1753-1758&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=EGER,%20P.&LAFFON,%20H.&BORDAS,%20P.&DE%20O%C3%91A%20WHILHELMI,%20E.&HINTON,%20J.&rft.genre=article |
Fichier(s) constituant ce document
| Fichiers | Taille | Format | Vue |
|---|---|---|---|
|
Il n'y a pas de fichiers associés à ce document. |
|||