Cloud Formation by Supernova Implosion

The deposition of energy and momentum by supernova explosions has been subject to numerous studies in the past few decades. However, while there has been some work that focused on the transition from the adiabatic to the radiative stage of a supernova remnant (SNR), the late radiative stage and merg...

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Veröffentlicht in:The Astrophysical journal 2024-04, Vol.965 (2), p.168
Hauptverfasser: Romano, Leonard E. C., Behrendt, Manuel, Burkert, Andreas
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Behrendt, Manuel
Burkert, Andreas
description The deposition of energy and momentum by supernova explosions has been subject to numerous studies in the past few decades. However, while there has been some work that focused on the transition from the adiabatic to the radiative stage of a supernova remnant (SNR), the late radiative stage and merging with the interstellar medium (ISM) have received little attention. Here, we use three-dimensional, hydrodynamic simulations, focusing on the evolution of SNRs during the radiative phase, considering a wide range of physical explosion parameters ( n H , ISM ∈ 0.1 , 100 cm − 3 and E SN ∈ 1 , 14 × 10 51 erg ). We find that the radiative phase can be subdivided in four stages: A pressure-driven snowplow phase, during which the hot overpressurized bubble gas is evacuated and pushed into the cold shell; a momentum-conserving snowplow phase that is accompanied by a broadening of the shell; an implosion phase where cold material from the back of the shell is flooding the central vacuum; and a final cloud phase, during which the imploding gas is settling as a central, compact overdensity. The launching timescale for the implosion ranges from a few 100 kyr to a few Myr, while the cloud formation timescale ranges from a few to about 10 Myr. The highly chemically enriched clouds can become massive ( M cl ∼ 10 3 –10 4 M ⊙ ) and self-gravitating within a few Myr after their formation, providing an attractive, novel pathway for supernova-induced star and planet formation in the ISM.
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subjects Cloud formation
Dense interstellar clouds
Explosions
Gravitation
Hydrodynamical simulations
Implosions
Interstellar dynamics
Interstellar matter
Interstellar medium
Momentum
Planet formation
Shocks
Supernova
Supernova remnants
Time
title Cloud Formation by Supernova Implosion
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