The Local Bubble is a Local Chimney: A New Model from 3D Dust Mapping
arxiv(2024)
Abstract
Leveraging a high-resolution 3D dust map of the solar neighborhood from
Edenhofer et al. (2023), we derive a new 3D model for the dust-traced surface
of the Local Bubble, the supernova-driven cavity surrounding the Sun. We find
that the surface of the Local Bubble is highly irregular in shape, with its
peak extinction surface falling at an average distance of 170 pc from the Sun
(spanning 70-600+ pc) with a typical thickness of 35 pc and a total dust-traced
mass of (6.0 ± 0.7) × 10^5 M_⊙. The Local Bubble displays
an extension in the Galactic Northern hemisphere that is morphologically
consistent with representing a "Local Chimney." We argue this chimney was
likely created by the "bursting" of this supernova-driven superbubble, leading
to the funneling of interstellar medium ejecta into the lower Galactic halo. We
find that many well-known dust features and molecular clouds fall on the
surface of the Local Bubble and that several tunnels to other adjacent cavities
in the interstellar medium may be present. Our new, parsec-resolution view of
the Local Bubble may be used to inform future analysis of the evolution of
nearby gas and young stars, the investigation of direct links between the solar
neighborhood and the Milky Way's lower halo, and numerous other applications.
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