Dense Gas Formation via Collision-induced Magnetic Reconnection in a Disk Galaxy with a Bisymmetric Spiral Magnetic Field
نویسندگان
چکیده
Abstract Recently, a collision-induced magnetic reconnection (CMR) mechanism was proposed to explain dense filament formation in the Orion A giant molecular cloud. natural question is whether CMR works elsewhere Galaxy. As an initial attempt answer question, this paper investigates triggering of and production gas flat-rotating disk with modified Bisymmetric spiral (BSS) field. Cloud−cloud collisions at field reversals are modeled Athena++ code. Under condition that representative warm neutral medium, cloud−cloud collision successfully triggers different radii. However, hindered by dominating thermal pressure, unless moderately stronger ≳5 μ G present. The strong-field model, having larger Lundquist number S L lower plasma β , activates plasmoid instability midplane, which otherwise suppressed rotation. We speculate can be common if more clouds collide along reversals. witness process numerical simulations, we need significantly resolve midplane spatial dynamic range ≳10 6 . If Milky Way arms indeed coincide BSS, it possible creates or maintains arms. High-resolution, high-sensitivity Zeeman/Faraday rotation observations crucial for finding candidates have helical fields.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2022
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/ac70cd