On the diffuse X-ray emission from the Wolf–Rayet bubble NGC 2359

A recent XMM–Newton observation has revealed diffuse X-ray emission inside the nebula NGC 2359 around the Wolf–Rayet star WR 7. Taking advantage of an improved point-source rejection and background subtraction, and a detailed comparison of optical and X-ray morphology, we have reanalysed these X-ray...

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Published in:Monthly notices of the Royal Astronomical Society 2015-01, Vol.446 (1), p.1083-1089
Main Authors: Toalá, J. A., Guerrero, M. A., Chu, Y.-H., Gruendl, R. A.
Format: Article
Language:English
Subjects:
Bubbles
Diffusion
Emission
Emission analysis
Luminosity
Magnesium
Mathematical models
Morphology
Nebulae
Stars & galaxies
X-ray astronomy
X-rays
XMM (spacecraft)
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creator Toalá, J. A.
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description A recent XMM–Newton observation has revealed diffuse X-ray emission inside the nebula NGC 2359 around the Wolf–Rayet star WR 7. Taking advantage of an improved point-source rejection and background subtraction, and a detailed comparison of optical and X-ray morphology, we have reanalysed these X-ray observations. Our analysis reveals diffuse X-ray emission from a blowout and the presence of emission at energies from 1.0 to 2.0 keV. The X-ray emission from NGC 2359 can be described by an optically thin plasma emission model, but contrary to previous analysis, we find that the chemical abundances of this plasma are similar to those of the optical nebula, with no magnesium enhancement, and that two components at temperatures T 1 = 2 × 106 K and T 2 = 5.7 × 107 K are required. The estimated X-ray luminosity in the 0.3–2.0 keV energy range is L X = 2 × 1033 erg s−1. The averaged rms electron density of the X-ray-emitting gas (n e ≲ 0.6 cm−3) reinforces the idea of mixing of material from the outer nebula into the hot bubble.
doi_str_mv 10.1093/mnras/stu2163
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subjects Bubbles
Diffusion
Emission
Emission analysis
Luminosity
Magnesium
Mathematical models
Morphology
Nebulae
Stars & galaxies
X-ray astronomy
X-rays
XMM (spacecraft)
title On the diffuse X-ray emission from the Wolf–Rayet bubble NGC 2359
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