Infrared identification of 2XMM J191043.4+091629.4

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Title: Infrared identification of 2XMM J191043.4+091629.4
Authors: Rodes Roca, José Joaquín | Torrejon, Jose M. | Martínez Núñez, Silvia | Bernabeu, Guillermo | Magazzù, Antonio
Research Group/s: Astronomía y Astrofísica
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal
Keywords: X-rays: binaries | X-rays: stars | Infrared: stars | Virtual observatory tools
Knowledge Area: Física Aplicada
Issue Date: Jul-2013
Publisher: EDP Sciences
Citation: Astronomy & Astrophysics. 2013, 555: A115. doi:10.1051/0004-6361/201321923
Abstract: Context. We report the infrared identification of the X-ray source 2XMM J191043.4+091629.4, which was detected by XMM-Newton/EPIC in the vicinity of the Galactic supernova remnant W49B. Aims. The aim of this work is to establish the nature of the X-ray source 2XMM J191043.4+091629.4 studying both the infrared photometry and spectroscopy of the companion. Methods. We analysed UKIDSS images around the best position of the X-ray source and obtained spectra of the best candidate using NICS in the Telescopio Nazionale Galileo (TNG) 3.5-m telescope. We present photometric and spectroscopic TNG analyses of the infrared counterpart of the X-ray source, identifying emission lines in the K-band. The H-band spectra does not present any significant feature. Results. We have shown that the Brackett γ H i at 2.165 μm, and He i at 2.184 μm and at 2.058 μm are significantly present in the infrared spectrum. The CO bands are also absent from our spectrum. Based on these results and the X-ray characteristics of the source, we conclude that the infrared counterpart is an early B-type supergiant star with an E(B − V) = 7.6 ± 0.3 at a distance of 16.0 ± 0.5 kpc. This would be, therefore, the first high-mass X-ray binary in the Outer Arm at galactic longitudes of between 30° and 60°.
Sponsor: This work was supported by the Spanish Ministry of Education and Science project number AYA2010-15431, De INTEGRAL a IXO: binarias de rayos X y estrellas activas. J.J.R.R. acknowledges the support by the Spanish Ministerio de Educación y Ciencia under grant PR2009-0455.
URI: http://hdl.handle.net/10045/33626
ISSN: 0004-6361 (Print) | 1432-0746 (Online)
DOI: 10.1051/0004-6361/201321923
Language: eng
Type: info:eu-repo/semantics/article
Rights: © ESO, 2013
Peer Review: si
Publisher version: http://dx.doi.org/10.1051/0004-6361/201321923
Appears in Collections:INV - Astronomía y Astrofísica - Artículos de Revistas

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