Abstract Details
| Name: Manash Samal Affiliation: National Central University, Taiwan Conference ID: ASI2018_1739 Title : Understanding star formation in filamentary clouds - a case study on the G182.4+00.3 cloud Authors and Co-Authors : Wen-Ping Chen (Garduate Institute of Astronomy, National Central University, Taiwan), Yan Sun (Purple Mountain Observatory, Chinese Academy of Sciences, China), Jessy Jose (Indian Institute of Science Education and Research, Tirupati, India) Abstract Type : Contributed Talk Abstract Category : Stars,ISM and the Galaxy Abstract : Recent Herschel observations have shown that most of the star formation occurs in filaments, yet how fragmentation operates in filaments and why at only some locations of filaments cluster formation happens, are far from being clear. In this talk, I will present observations towards the G182.4+00.3 molecular cloud in the transition of 12CO, 13CO and C18O, along with the deep near-infrared data from CFHT. We find, though the emission from three molecular lines shows different emission areas with their own distinct structures, the 13CO integrated intensity map clearly reveals a filamentary cloud of length ~1 degree (32 pc) with column density greater than 5 x 10^21 cm^-2. The distribution of excitation temperature shows two phases: i) cold gas of ~ 10 K across the large area of the filament, ii) relatively warm gas in the range 15-25 K at one end of the filament. We find that the later part hosts a rich near-infrared cluster. I will discuss the star formation properties of the cluster and compare its characteristics with the galactic embedded clusters. Finally, I will explore the physical conditions and kinematics of the cloud and energy budget of the nearby massive stars to conclude whether the cluster has formed out of the fragmentation of the filament or merger of converging gas flows or compression of the filament by the nearby expanding HII region. |