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Discovery of x-ray emission from young suns in the small magellanic cloud

Oskinova, LM, Sun, W, Evans, CJ, Hénault-Brunet, V, Chu, YH, Gallagher, JS, Guerrero, MA, Gruendl, RA, Güdel, M, Silich, S, Chen, Y, Nazé, Y, Hainich, R and Reyes-Iturbide, J (2013) Discovery of x-ray emission from young suns in the small magellanic cloud Astrophysical Journal, 765 (1).

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Abstract

We report the discovery of extended X-ray emission within the young star cluster NGC 602a in the Wing of the Small Magellanic Cloud (SMC) based on observations obtained with the Chandra X-Ray Observatory. X-ray emission is detected from the cluster core area with the highest stellar density and from a dusty ridge surrounding the H II region. We use a census of massive stars in the cluster to demonstrate that a cluster wind or wind-blown bubble is unlikely to provide a significant contribution to the X-ray emission detected from the central area of the cluster. We therefore suggest that X-ray emission at the cluster core originates from an ensemble of low- and solar-mass pre-main-sequence (PMS) stars, each of which would be too weak in X-rays to be detected individually. We attribute the X-ray emission from the dusty ridge to the embedded tight cluster of the newborn stars known in this area from infrared studies. Assuming that the levels of X-ray activity in young stars in the low-metallicity environment of NGC 602a are comparable to their Galactic counterparts, then the detected spatial distribution, spectral properties, and level of X-ray emission are largely consistent with those expected from low- and solar-mass PMS stars and young stellar objects (YSOs). This is the first discovery of X-ray emission attributable to PMS stars and YSOs in the SMC, which suggests that the accretion and dynamo processes in young, low-mass objects in the SMC resemble those in the Galaxy. © 2013. The American Astronomical Society. All rights reserved..

Item Type: Article
Authors :
NameEmailORCID
Oskinova, LMUNSPECIFIEDUNSPECIFIED
Sun, WUNSPECIFIEDUNSPECIFIED
Evans, CJUNSPECIFIEDUNSPECIFIED
Hénault-Brunet, VUNSPECIFIEDUNSPECIFIED
Chu, YHUNSPECIFIEDUNSPECIFIED
Gallagher, JSUNSPECIFIEDUNSPECIFIED
Guerrero, MAUNSPECIFIEDUNSPECIFIED
Gruendl, RAUNSPECIFIEDUNSPECIFIED
Güdel, MUNSPECIFIEDUNSPECIFIED
Silich, SUNSPECIFIEDUNSPECIFIED
Chen, YUNSPECIFIEDUNSPECIFIED
Nazé, YUNSPECIFIEDUNSPECIFIED
Hainich, RUNSPECIFIEDUNSPECIFIED
Reyes-Iturbide, JUNSPECIFIEDUNSPECIFIED
Date : 1 March 2013
Identification Number : https://doi.org/10.1088/0004-637X/765/1/73
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 12:54
Last Modified : 17 May 2017 12:54
URI: http://epubs.surrey.ac.uk/id/eprint/837170

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