NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T13:26:59 PDT
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For refcode 2014PASJ...66...27P:
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NED Abstract

Copyright by Astronomical Society of Japan. 2014PASJ...66...27P Environmental dependence of star formation law in the disk and center of IC 342 Pan, Hsi-An; Kuno, Nario; Hirota, Akihiko Abstract. The Kennicutt-Schmidt (K-S) law in IC 342 is examined using the ^12^CO-to-H_2_ conversion factor (X_CO,v_), which depends on the metallicity and CO intensity. Additionally, an optically thin ^13^CO (1-0) is also independently used to analyze the K-S law. X_CO,v_ is two to three times lower than the galactic standard X_CO_ in the galactic center and approximately two times higher than X_CO_ at the disk. The surface densities of molecular gas (Sigma_{H_2_}_) derived from ^12^CO and ^13^CO are consistent with the environment in a high-Sigma_{H_2_}_ region. By comparing the K-S law in the disk and the central regions of IC 342, we found that the power law index of the K-S law (N) increases toward the central region. Furthermore, the dependence of N on Sigma_{H_2_}_ is observed. Specifically, N increases with Sigma_{H_2_}_. The derived N in this work and previous observations are consistent with the implication that star formation is likely triggered by gravitational instability in the disk (low-Sigma_{H_2_}_ region) of IC 342 and both gravitational instability and cloud-cloud collisions in the central region (high-Sigma_{H_2_}_ regime). In addition, the increasing N toward the high-Sigma_{H_2_}_ domain also matches the theoretical prediction regarding the properties of giant molecular clouds. The results of IC 342 are supported by the same analysis of other nearby galaxies. Key words: galaxies: individual (IC 342), galaxies: ISM, galaxies: star formation, ISM: molecules
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