On the Near-infrared Identification of the INTEGRAL Source IGR J16328-4726
Journal
Date Issued
2015
Author(s)
Description
This work is based on observations made with the Baade telescope located at Las Campanas Observatory (Chile). We thank Dr. Andrew Monson for obtaining the JHK s images at our request. M. Tapia acknowledges DGAPA/UNAM grant No. IN-101813.
Abstract
The aim of this work is to identify the infrared (IR) counterpart of the Galactic high-mass X-ray binary IGR J16328-4726 discovered by the INTEGRAL satellite, and to derive the extinction and distance to the system. We present new deep sub-arcsecond JHKs imaging and low-resolution near-IR spectroscopy in the 1.5 and 2.4 μm range of IGR J16328-4726. We report the presence of two near-IR stellar sources separated by about 1.″8 at the location of the unresolved 2MASS source J16323791-4723409, previously considered to be the near-IR counterpart of the X-ray source. From the analysis of their near-IR colors and spectra as well as accurate positions, we uniquely identify the true IR counterpart of IGR J16328-4726. Our 1.5-2.4 μm spectrum of this star is consistent with the published classification O8Iafpe. Assuming this, and in combination with new JHKs photometry, a reddening AV = 23.6 ± 0.7 and a distance of 7.2 ± 0.3 kpc from the Sun are derived.
Volume
150
Issue
1
Start page
21
Issn Identifier
0004-6256
Ads BibCode
2015AJ....150...21P
Rights
open.access
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