Title:	Evolution of clustered supernovae
Authors:	Vasiliev, Evgenii O. Shchekinov, Yuri Nath, Biman B.
Keywords:	Supernova remnants bubbles shock waves
Issue Date:	Jul-2017
Publisher:	Oxford University Press for the Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society, 2017, Vol. 468, p2757-2770
Abstract:	We study the merging and evolution of isolated supernovae (SNe) remnants in a stellar cluster into a collective superbubble, with the help of 3-D hydrodynamic simulations. We particularly focus on the transition stage when the isolated SNe remnants gradually combine to form a superbubble. We find that when the SN rate is high (νsn∼10−9 pc−3 yr−1), the merging phase lasts for ∼104 yr, for n=1--10 cm−3, and the merging phase lasts for a longer time (∼0.1 Myr or more) for lower SN rates (νsn≤10−10 pc−3 yr−1). During this transition phase, the growing superbubble is filled with dense and cool fragments of shells and most of the energy is radiated away during this merging process. After passing through the intermediate phase, the superbubble eventually settles on to a new power-law wind asymptote that is smaller than estimated in a continuous wind model. This results in a significant (more than {\it several times}) underestimation of the mechanical luminosity needed to feed the bubble. We determine the X-ray and Hα surface brightnesses as functions of time for such merging SNe in a stellar cluster and find that clusters with high SN rate shine predominantly in soft X-rays and Hα. In particular, a low value of the volume averaged Hα to Hβ ratio and its large spread can be a good indicator of the transition phase of merging SNe.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6741
ISSN:	0035-8711 1365-2966 (Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2017MNRAS.468.2757V http://arxiv.org/abs/1703.07331 http://dx.doi.org/10.1093/mnras/stx719
Copyright:	2017 The authors & the Royal Astronomical Society
Appears in Collections:	Research Papers (A&A)

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