On the Near-infrared Identification of the INTEGRAL Source IGR J16328-4726

Journal
Date Issued
2015
Author(s)
Persi, P.
•
•
Tapia, M.
•
Roth, M.
•
•
Ubertini, P.
•
Parisi, P.
DOI
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
Uri
Url
Issn Identifier
0004-6256
Ads BibCode
2015AJ....150...21P
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

IGRJ16328.pdf

Description
preprint
Size

149.11 KB

Format

Adobe PDF

Checksum (MD5)

a17d44de5a140c7bf9cec2fa8e50bbdf

Loading...
Thumbnail Image
Name

Persi_2015_AJ_150_21.pdf

Description
Pdf editoriale
Size

505.08 KB

Format

Adobe PDF

Checksum (MD5)

fe20b8b8fb0e576714f9d3993c2776e6