| Authors : | Sudeshna Patra, Jessy Jose, Neal Evans, Kee-Tae Kim, Mark Heyer, Jens Kauffmann, Manash Samal, Swagat Das |
| Abstract : | Metallicity plays an immense role in the formation process of stars and planets. Understanding the star formation properties as a function of metallicity will impact our current understanding of galaxy evolution in the early universe – however, it is a challenging topic to quantify the differences due to the metallicity effect observationally. The outer part of the Milky Way is an ideal place to study the role of metallicity on various star formation processes because the metal abundance declines with galactocentric distance. The efficiency of gas cooling and dust shielding processes decreases with lower metallicity. It, therefore, affects the physical and chemical conditions of gas and dust compared to the Central Molecular Zone and Solar neighborhood. We have selected 19 star-forming regions in the outer Milky Way and observed CO(1-0), 13CO(1-0), HCN(1-0), HCO+(1-0) using the 14-m telescope at the Taeduk Radio Astronomy Observatory, KASI and complemented with deep near-infrared data (JHK) from UKIDSS and CFHT. We will present the results of the dependency of dense gas tracers (HCN and HCO+) on metallicity obtained from the molecular data. Based on JHK data the disk fraction studies for these outer Galaxy targets are done, we will discuss the role of low metallicity for short lifetime in protoplanetary disks. Finally, we will talk about the role of metallicity and Galactocentric distance on star formation activities, such as star formation rate (SFR), and efficiency (SFE), combining molecular and near-infrared data. |
