dc.contributor.author Basu, Aritra dc.contributor.author Roychowdhury, Sambit dc.contributor.author Heesen, Volker dc.contributor.author Beck, Rainer dc.contributor.author Brinks, Elias dc.contributor.author Westcott, Jonathan dc.contributor.author Hindson, Luke dc.date.accessioned 2018-08-16T00:13:28Z dc.date.available 2018-08-16T00:13:28Z dc.date.issued 2017-10-11 dc.identifier.citation Basu , A , Roychowdhury , S , Heesen , V , Beck , R , Brinks , E , Westcott , J & Hindson , L 2017 , ' New insights into the interstellar medium of the dwarf galaxy IC 10 : connection between magnetic fields, the radio--infrared correlation and star formation ' , Monthly Notices of the Royal Astronomical Society , vol. 471 , no. 1 , pp. 337-354 . https://doi.org/10.1093/mnras/stx1567 dc.identifier.issn 0035-8711 dc.identifier.other PURE: 12117710 dc.identifier.other PURE UUID: 5fb91da4-f041-4fe9-b789-4b535995854e dc.identifier.other ArXiv: http://arxiv.org/abs/1706.06426v1 dc.identifier.other Scopus: 85042534523 dc.identifier.other ORCID: /0000-0002-7758-9699/work/54143423 dc.identifier.uri http://hdl.handle.net/2299/20390 dc.description This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. Available at doi: https://doi.org/10.1093/mnras/stx1567. dc.description.abstract We present the highest sensitivity and angular resolution study at 0.32 GHz of the dwarf irregular galaxy IC\,10, observed using the Giant Metrewave Radio Telescope, probing $\sim45$ pc spatial scales. We find the galaxy-averaged radio continuum spectrum to be relatively flat, with a spectral index $\alpha = -0.34\pm0.01$ ($S_\nu \propto \nu^\alpha$), mainly due to a high contribution from free--free emission. At 0.32 GHz, some of the H{\sc ii} regions show evidence of free--free absorption as they become optically thick below $\sim0.41$ GHz with corresponding free electron densities of $\sim11-22~\rm cm^{-3}$. After removing the free--free emission, we studied the radio--infrared relations on 55, 110 and 165 pc spatial scales. We find that on all scales the non-thermal emission at 0.32 and 6.2 GHz correlates better with far-infrared (FIR) emission at $70\,\mu$m than mid-infrared emission at $24\,\mu$m. The dispersion of the radio--FIR relation arises due to variations in both magnetic field and dust temperature, and decreases systematically with increasing spatial scale. The effect of cosmic ray transport is negligible as cosmic ray electrons were only injected $\lesssim5$ Myr ago. The average magnetic field strength ($B$) of $12~\mu$G in the disc is comparable to that of large star-forming galaxies. The local magnetic field is strongly correlated with local star formation rate ($\mathrm{SFR}$) as $B \propto \mathrm{SFR}^{0.35\pm0.03}$, indicating a star-burst driven fluctuation dynamo to be efficient ($\sim10$ per cent) in amplifying the field in IC\,10. The high spatial resolution observations presented here suggest that the high efficiency of magnetic field amplification and strong coupling with SFR likely sets up the radio--FIR correlation in cosmologically young galaxies. en dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.rights Open dc.subject astro-ph.GA dc.title New insights into the interstellar medium of the dwarf galaxy IC 10 : connection between magnetic fields, the radio--infrared correlation and star formation en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Centre for Astrophysics Research dc.description.status Peer reviewed dc.description.versiontype Final Accepted Version dcterms.dateAccepted 2017-10-11 rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stx1567 rioxxterms.licenseref.uri http://creativecommons.org/licenses/by/4.0/ rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype Open
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