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THE JET AND ARC MOLECULAR CLOUDS TOWARD WESTERLUND 2, RCW 49, AND HESS J1023–575;12CO AND13CO (J= 2-1 andJ= 1-0) OBSERVATIONS WITH NANTEN2 AND MOPRA TELESCOPE

N. Furukawa, A. Ohama, T. Fukuda, K. Torii, T. Hayakawa, H. Sano, T. Okuda, H. Yamamoto, N. Moribe, A. Mizuno, H. Maezawa, T. Onishi (+11 others)
2014 Astrophysical Journal  

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2014 pre-print
arXiv:1401.4845v1 fatcat:wag3x4lewfcdlk5qcnecp2zwj4
We have made new CO observations of two molecular clouds, which we call "jet" and "arc" clouds, toward the stellar cluster Westerlund 2 and the TeV gamma-ray source HESS J1023-575. The jet cloud shows a linear structure from the position of Westerlund 2 on the east. In addition, we have found a new counter jet cloud on the west. The arc cloud shows a crescent shape in the west of HESS J1023-575. A sign of star formation is found at the edge of the jet cloud and gives a constraint on the age of
more » ... he jet cloud to be ~Myrs. An analysis with the multi CO transitions gives temperature as high as 20 K in a few places of the jet cloud, suggesting that some additional heating may be operating locally. The new TeV gamma-ray images by H.E.S.S. correspond to the jet and arc clouds spatially better than the giant molecular clouds associated with Westerlund 2. We suggest that the jet and arc clouds are not physically linked with Westerlund 2 but are located at a greater distance around 7.5 kpc. A microquasar with long-term activity may be able to offer a possible engine to form the jet and arc clouds and to produce the TeV gamma-rays, although none of the known microquasars have a Myr age or steady TeV gamma-rays. Alternatively, an anisotropic supernova explosion which occurred ~Myr ago may be able to form the jet and arc clouds, whereas the TeV gamma-ray emission requires a microquasar formed after the explosion.
doi:10.1088/0004-637x/781/2/70 fatcat:adtv4jau5nh3jeix4ghz3dd4sq
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Citation

N. Furukawa, A. Ohama, T. Fukuda, K. Torii, T. Hayakawa, H. Sano, T. Okuda, H. Yamamoto, N. Moribe, A. Mizuno, H. Maezawa, T. Onishi, A. Kawamura, N. Mizuno, J. R. Dawson, T. M. Dame, Y. Yonekura, F. Aharonian, E. de Oña Wilhelmi, G. P. Rowell, R. Matsumoto, Y. Asahina, Y. Fukui. "THE JET AND ARC MOLECULAR CLOUDS TOWARD WESTERLUND 2, RCW 49, AND HESS J1023–575;12CO AND13CO (J= 2-1 andJ= 1-0) OBSERVATIONS WITH NANTEN2 AND MOPRA TELESCOPE." Astrophysical Journal 781.2 (2014) 70