Shock-induced transformation of non-magnetic to magnetic ISM dust analogue

Roy, A and Singh, SV and Meka, JK and Ramachandran, R and Sahu, D and Gautam, A and Vijay, T and Vishakantaiah, J and Janardhan, P and Rajasekhar, BN and Bhardwaj, A and Mason, NJ and Sivaraman, B (2022) Shock-induced transformation of non-magnetic to magnetic ISM dust analogue. In: Monthly Notices of the Royal Astronomical Society, 517 (4). pp. 4845-4855.

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Abstract

The fate of organometallic dust subjected to extreme conditions, especially the shock fronts, in the interstellar medium (ISM) has not been explored to date. Iron and cyclopentadiene, which have been found to be present in the ISM, are known to react and produce the organometallic compound ferrocene under terrestrial conditions. In our experiment we subjected ferrocene, a possible proxy of such dust, to ∼5.6 Mach (M) shock commensurate with conditions encountered in the ISM, leading to a temperature rise up to 7300 K within 2 ms. Analysis of the post-shock residue showed the presence of a α-Fe and Fe3C composite that responded to an external magnetic field. These results show that a non-magnetic dust composed of molecules containing transition metals undergoing shock processing in the ISM can dissociate and synthesize dust that is then magnetic. Such drastic transformations from non-magnetic to magnetic dust induced by shocks might be of importance in interstellar polarization.

Item Type:	Journal Article
Publication:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
Additional Information:	The copyright for this article belongs to the Oxford University Press.
Keywords:	Dust; Iron compounds; Organometallics; Synthesis (chemical); Transition metals, Astrochemistry; Condition; Dust extinctions; Ferrocenes; Interstellar medias; Magnetic dust; Methods:laboratory; Nonmagnetics; Shock-induced transformation; Shock-waves, Shock waves
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	31 Jan 2023 09:47
Last Modified:	31 Jan 2023 09:47
URI:	https://eprints.iisc.ac.in/id/eprint/79634

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