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25 April 2024 |
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Article overview
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Effect of feedback of massive stars in the fragmentation, distribution, and kinematics of the gas in two star forming regions in the Carina Nebula | | David Rebolledo
; Andrés E. Guzmán
; Yanett Contreras
; Guido Garay
; S.-N. X. Medina
; Patricio Sanhueza
; Anne J. Green
; Camila Castro
; Viviana Guzmán
; Michael G. Burton
; | | Date: |
20 Jan 2020 | | Abstract: | We present ALMA high spatial resolution observations towards two star forming
regions located in one of the most extreme zones of star formation in the
Galaxy, the Carina Nebula. One region is located at the center of the nebula
and is severally affected by the stellar feedback from high-mass stars, while
the other region is located further south and is less disturbed by the massive
star clusters. We found that the region at the center of the nebula is forming
less but more massive cores than the region located in the south, suggesting
that the level of stellar feedback effectively influence the fragmentation
process in clumps. Lines such as HCN, HCO$^{+}$ and SiO show abundant and
complex gas distributions in both regions, confirming the presence of
ionization and shock fronts. Jeans analysis suggests that the observed core
masses in the region less affected by the massive stars are consistent with
thermal fragmentation, but turbulent Jeans fragmentation might explain the high
masses of the cores identified in the region in the center of Carina.
Consistently, two different analyses in the HCO$^{+}$ line provided evidence
for a higher level of turbulence in the gas more affected by the stellar
feedback. The gas column density probability functions, N-PDFs, show log-normal
shapes with clear transitions to power law regimes. We observed a wider N-PDF
in the region at the center of the nebula, which provides further evidence for
a higher level of turbulence in the material with a higher level of massive
stellar feedback. | | Source: | arXiv, 2001.6969 | | Services: | Forum | Review | PDF | Favorites | |
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