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formerly Baltic Astronomy

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Volume 26, Issue 1

Issues

Star formation in shells of colliding multi-SNe bubbles

Evgenii O. Vasiliev / Yuri A. Shchekinov
  • Lebedev Physical Institute of Russian Academy of Sciences, ASC, Moscow 117997, Russian Federation
  • Raman Research Institute, Sadashiva Nagar, Bangalore 560080, India
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Published Online: 2017-12-29 | DOI: https://doi.org/10.1515/astro-2017-0021

Abstract

It is believed that when bubbles formed by multiple supernovae explosions interact with one another, they stimulate star formation in overlapping shells. We consider the evolution of a shocked layer formed by the collision of two identical bubbles each of which originated from OB clusters of ∼ 50 members and ∼ 50 pc. The clusters are separated by 200-400 pc.We found that depending on evolutionary status of colliding bubbles the shocked layer can either be destroyed into diffuse lumps, or be fragmented into dense clumps: the former occurs in collisions of young bubbles with continuing supernovae explosions, and the latter occurs in older bubble interactions.We argue that fragmentation efficiency in shells depends on external heating: for a heating rate <∼ 1.7×10−24 erg s−1 the number of fragments formed in a collision of two old bubbles reaches several tens at t ∼ 4 Myr, while a heating rate >∼ 7 × 10−24 erg s−1 prevents fragmentation. The clumps formed in freely expanding parts of bubbles are gradually destroyed and disappear on t <∼ 1 Myr,whereas those formed in the overlapping shells survive much longer. Because of this the number of fragments in an isolated bubble begins to decrease after reaching a maximum, while in collision of two old bubbles it fluctuates around 60-70 until longer than t ∼ 5 Myr.

Keywords : galaxies: ISM - ISM: bubbles - shock waves - supernova remnants

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About the article

Received: 2017-09-14

Accepted: 2017-11-16

Published Online: 2017-12-29

Published in Print: 2017-12-20


Citation Information: Open Astronomy, Volume 26, Issue 1, Pages 233–239, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0021.

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[1]
Oleg V Egorov, Tatiana A Lozinskaya, Alexei V Moiseev, and Grigorii V Smirnov-Pinchukov
Monthly Notices of the Royal Astronomical Society, 2018, Volume 478, Number 3, Page 3386

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