Massive star formation in the infrared dark cloud G024.64+00.16
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Typ
Examensarbete för kandidatexamen
Program
Publicerad
2020
Författare
Ulberstad, Emma
Lind, Axel
Askbom, Ludvig
Modellbyggare
Tidskriftstitel
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Sammanfattning
Massive stars drive the energy content and chemical enrichment of galaxies. Despite their
importance, it is still not fully understood what mechanisms leads to the formation of massive
stars. It is therefore important to study the regions in the universe where massive stars
form, infrared dark clouds, to better understand the physical conditions under which massive
star formation occurs. In this project we have investigated the kinematic structure, physical
conditions and star formation content of the IRDC G024.64+00.16. We have used a mass
surface density map obtained from near IR data to investigate the presence of massive cores
within the cloud. Multi wavelength images obtained by Spitzer and Hershel have been used to
identify the relative evolutionary stage of these massive cores. We have also used 13CO(1-0) and
C18O(1-0) maps from the FUGIN survey to investigate the kinematics of the gas at the cloud
and core scale. The physical conditions of the cores were determined by calculating the column
density, the mass surface density and the depletion for 13CO and C18O. A virial analysis was
done to estimate if the gas of the cores are gravitationally bound or unbound. We nd that
the IRDC contains three cores and that none of these are associated with IR signatures at 4.5,
8, 24 or 70 μm, indicating that these cores are likely at an early relative evolutionary stage.
Finally, we nd that the cores within the cloud show 13CO and C18O column densities in the
range 1.87 - 2.28 1016 cm2 and 0.50 - 0.81 1016 cm2 respectively, virial parameters vir
>1 and depletion factors in the range 6.15 - 10.13 for 13CO and 2.80 - 6.41 for C18O.
Beskrivning
Ämne/nyckelord
Massive star formation, infrared dark cloud, G024.64+00.16