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2018ApJ...864...12B - Astrophys. J., 864, 12-12 (2018/September-1)

A spatially resolved study of X-ray properties in superbubble 30 Dor C with XMM-Newton.


Abstract (from CDS):

We carry out a spatially resolved spectral analysis with a physical scale of ∼10 pc in X-ray for the superbubble 30 Dor C, which has the largest diameter of ∼80 pc and the brightest non-thermal emission in superbubbles, for the first time. We aim at investigating spatial variation of the physical properties of non-thermal emission as detected in some supernova remnants in order to study particle acceleration in a superbubble. We demonstrated that non-thermal components are detected in all the regions covering the entire field of 30 Dor C. The spectra in the west region of 30 Dor C can be described with a combination of the thermal and non-thermal components, while the spectra in the east region can be fitted with the non-thermal component alone. The photon index and absorption-corrected intensity in 2-10 keV of the non-thermal component show spatial variation from ∼2.0 to ∼3.7 and (4-130) x 10–8 erg s–1 cm–2 str–1, respectively, and the negative correlation between the non-thermal physical properties is observed. The temperature and normalization of the thermal component also vary within a range of ∼0.2-0.3 keV and ∼(0.2-7) x 1017 cm–5 str–1, respectively, and the positive correlation between the photon index and the normalization is also detected. We revealed the correlations in a supperbubble for the first time as is the case in supernova remnants, which suggests the possibility that the same acceleration mechanism works also in the supperbubble.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): acceleration of particles - ISM: bubbles - X-rays: individual: 30 Dor C - X-rays: ISM

Simbad objects: 11

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