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Paper: Spectral-Line Survey at Millimeter and Submillimeter Wavelengths toward an Outflow-Shocked Region, OMC2-FIR 4
Volume: 476, New Trends in Radio Astronomy in the ALMA Era
Page: 341
Authors: Shimajiri, Y.; Sakai, T.; Kitamura, Y.; Tsukagoshi, T.; Saito, M.; Nakamura, F.; Momose, M.; Kawabe, R.
Abstract: We performed a spectral-line survey toward the three positions, an outflow-shocked region, OMC2-FIR 4, in addition to the driving source of the molecular outflow, FIR 3, and the northern outflow lobe, FIR 3N, with the Nobeyama 45 m and ASTE telescopes. We detected more than 100 molecular lines. We found that the line profiles can be classified into the following two types: a single Gaussian component with a narrow (< 3 km s-1) velocity width and two Gaussian components with narrow and wide (> 3 km s-1) velocity widths. The wide components of CO, CS, HCO+, and HCN are also detected at three positions including FIR 3N, suggesting that these trace the molecular outflow. On the other hand, the wide components of SiO, SO, C34S, CH3OH, H13CN, and H15CN isotopes are detected only at the outflow shocked region, FIR 4, suggesting that these trace the outflow-shocked gas. In addition, the rotation diagram analysis revealed that the narrow components in both the two profile types correspond to the gas with a low temperature of 20–30 K, while the wide components trace a high temperature of 50–150 K. These results support our interpretation that the wide velocity components trace the molecular outflow and/or outflow-shocked gas.
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