Gas kinematics and dynamics of Carina Pillars: A case study of G287.76-0.87
arxiv(2024)
摘要
We study the kinematics of a pillar, namely G287.76-0.87, using three
rotational lines of ^12CO(5-4), ^12CO(8-7), ^12CO(11-10), and a
fine structure line of [OI] 63 μm Southern Carina observed by SOFIA/GREAT.
This pillar is irradiated by the associated massive star cluster Trumpler 16,
which includes η Carina. Our analysis shows that the relative velocity of
the pillar with respect to this ionization source is small, ∼ 1
km s^-1, and the gas motion in the tail is more turbulent than in the head.
We also performed analytical calculations to estimate the gas column density in
local thermal equilibrium (LTE) conditions, which yields N_ CO as (∼
0.2 -5)× 10^17 cm^-2. We further constrain the gas's physical
properties in non-LTE conditions using RADEX. The non-LTE estimations result in
n_ H_2≃ 10^5 cm^-3 and N_ CO≃ 10^16
cm^-2. We found that the thermal pressure within the G287.76-0.87 pillar is
sufficiently high to make it stable for the surrounding hot gas and radiation
feedback if the winds are not active. While they are active, stellar winds from
the clustered stars sculpt the surrounding molecular cloud into pillars within
the giant bubble around η Carina.
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