SEARCH FOR COMPLEX ORGANIC MOLECULES (COMS) IN G354.61+0.47 FROM ALMA OBSERVATIONS

• Main Author: Rahmi Izzati, Fathia
• Format: Final Project
• Language: Indonesia
• Subjects: Astronomi
• Online Access: https://digilib.itb.ac.id/gdl/view/73611
• Institution: Institut Teknologi Bandung

The definition of a massive star is based on the mass limit required to exceed the Chandrasekar limit, which creates a neutron star or a black hole (greater than 8M?). Massive stars have a role in influencing the local and global dynamics of the interstellar medium. Massive stars can be an effective form of matter because of its short life and can produce as well as spread heavy elements such as iron (also supported through the process of death of massive stars, supernova explosions). Complex Organic Molecules (COMs) in the interstellar medium have been found towards the so-called hot cores associated with high-mass star-forming regions (Blake et al. 1987; Garay & Lizano 1999; Kurtz et al. 2000). These objects experience radiative heating from the central protostar, which raises the temperature to T ? 100–200K over an area of 0.05–0.1 pc. This thermal desorption of heavier molecules from the ice mantles and grain surfaces, followed by gas-phase reactions, increases the chemical complexity of these objects. However, the observational data to investigate the presence of complex organic molecules in massive star-forming regions are still lacking because of the rarity of massive stars and the high extinction level from gases and dust that envelope their formation processes. The advance in radio observations, such as ALMA (Atacama Large Millimeter/submillimeter Array), helps to overcome these issues by providing us the capability to detect molecular tracers with high angular resolution. In this work, we use ALMA data to analyze and identify various organic molecules present in the G354.61+0.47. The results show that there are 14 COMs in its object such as CH3OH (methanol), CH3OCHO (methyl formate), CH3CN (methyl cyanide), etc. Besides, various molecules are able to be tracers of structure such as CO as outflow tracer and CH3OH as hot core tracer.