SEARCH FOR COMPLEX ORGANIC MOLECULES (COMS) IN G354.61+0.47 FROM ALMA OBSERVATIONS
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 effect...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/73611 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | 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. |
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