Volume 632, December 2019
|Number of page(s)||16|
|Section||Interstellar and circumstellar matter|
|Published online||12 December 2019|
Searching for further evidence for cloud–cloud collisions in L1188★
Max-Planck-Institut für Radioastronomie,
Auf dem Hügel 69,
2 Purple Mountain Observatory & Key Laboratory for Radio Astronomy, Chinese Academy of Sciences, 10 Yuanhua Road, 210033 Nanjing, PR China
3 Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 830011 Urumqi, PR China
4 Astronomy Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah 21589, Saudi Arabia
5 Max-Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
6 Korea Astronomy and Space Science Institute 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
7 School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, PR China
Accepted: 18 November 2019
In order to search for further observational evidence of cloud–cloud collisions in one of the promising candidates, L1188, we carried out observations of multiple molecular lines toward the intersection region of the two nearly orthogonal filamentary molecular clouds in L1188. Based on these observations, we find two parallel filamentary structures, both of which have at least two velocity components being connected with broad bridging features. We also found a spatially complementary distribution between the two molecular clouds, as well as enhanced 13CO emission and 12CO self-absorption toward their abutting regions. At the most blueshifted velocities, we unveil a 1 pc-long arc ubiquitously showing 12CO line wings. We discover two 22 GHz water masers, which are the first maser detections in L1188. An analysis of line ratios at a linear resolution of 0.2 pc suggests that L1188 is characterised by kinetic temperatures of 13–23 K and H2 number densities of 103–103.6 cm−3. On the basis of previous theoretical predictions and simulations, we suggest that these observational features can be naturally explained by the scenario of a cloud–cloud collision in L1188, although an additional contribution of stellar feedback from low-mass young stellar objects cannot be ruled out.
Key words: ISM: clouds / ISM: kinematics and dynamics / radio lines: ISM / ISM: molecules / ISM: individual objects: L1188
The reduced datacubes are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/632/A115
© Y. Gong et al. 2019
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Open Access funding provided by Max Planck Society.
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