TY - JOUR
T1 - A nonthermal superbubble in the irregular galaxy IC 10
AU - Yang, Hui
AU - Skillman, Evan D
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1993/10
Y1 - 1993/10
N2 - We present synthesis radio continuum observations of the nearby irregular galaxy IC 10. These observations, at λ6, λ20, and λ49 cm, allow us to measure the flux and spectral index of a number of resolved sources in IC 10. While most of these are easily identified as thermal emission from H II regions and a few are nonthermal background sources, one extended, nonthermal source appears to be a superbubble in IC 10. Its large size (≥250 pc) implies that it is most likely the product of several supernovae. Comparisons of these radio observations with Hα, H I, and optical imaging observations reveal that the large nonthermal superbubble is associated with a region of star formation containing two of the most luminous H II regions and the most massive H I cloud in IC 10. We tentatively identify a stellar cluster with two Wolf-Rayet stars in the center of the superbubble. We propose that this superbubble in IC 10 represents a bridge between the giant H II regions and the H I shells and supershells observed in our Galaxy and external galaxies.
AB - We present synthesis radio continuum observations of the nearby irregular galaxy IC 10. These observations, at λ6, λ20, and λ49 cm, allow us to measure the flux and spectral index of a number of resolved sources in IC 10. While most of these are easily identified as thermal emission from H II regions and a few are nonthermal background sources, one extended, nonthermal source appears to be a superbubble in IC 10. Its large size (≥250 pc) implies that it is most likely the product of several supernovae. Comparisons of these radio observations with Hα, H I, and optical imaging observations reveal that the large nonthermal superbubble is associated with a region of star formation containing two of the most luminous H II regions and the most massive H I cloud in IC 10. We tentatively identify a stellar cluster with two Wolf-Rayet stars in the center of the superbubble. We propose that this superbubble in IC 10 represents a bridge between the giant H II regions and the H I shells and supershells observed in our Galaxy and external galaxies.
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U2 - 10.1086/116738
DO - 10.1086/116738
M3 - Article
AN - SCOPUS:0000903233
SN - 0004-6256
VL - 106
SP - 1448
EP - 1459
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
ER -