Optical/IR counterpart to the resolved X-ray jet source CXO J172337.5−373442 and its distance

Autor: Jochen Greiner, N. Masetti, Sudip Bhattacharyya, T. Kruehler, Bhaswati Mookerjea, Pietro Parisi
Rok vydání: 2010
Předmět:
Zdroj: Monthly Notices of the Royal Astronomical Society: Letters. 409:L114-L118
ISSN: 1745-3925
DOI: 10.1111/j.1745-3933.2010.00960.x
Popis: We present results of observations in the optical to mid-infrared wavelengths of the X-ray source CXO J172337.5-373442, which was serendipitously discovered in the Chandra images and was found to have a fully resolved X-ray jet. The observations include a combination of photometry and spectroscopy in the optical using ground-based telescopes and mid-infrared photometry using Spitzer. We detect the optical/IR counterpart of CXO J172337.5-373442 and identify it to be a G9-V star located at a distance of 334+-60~pc. Comparable values of the hydrogen column densities determined independently from the optical/IR observations and X-ray observations indicate that the optical source is associated with the X-ray source. Since the X-ray luminosity can not be explained in terms of emission from a single G9-V star, it is likely that CXO J172337.5-373442 is an accreting compact object in a binary system. Thus, CXO J172337.5-373442 is the nearest known resolved X-ray jet from a binary system, which is not a symbiotic star. Based on the existing X-ray data, the nature of the compact object can not be confirmed. However the low luminosity of the X-ray point source, 7.1x10^{30} Lsun combined with estimates of the age of the jet and a lack of detection of bright outburst, suggests that the X-ray jet was launched during extreme quiescence of the object. The measured low X-ray luminosity of the jet suggests the likelihood of such jets being more ubiquitous than our current understanding.
Databáze: OpenAIRE
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