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dc.contributor.authorCseh, D.
dc.contributor.authorMiller-Jones, James
dc.contributor.authorJonker, P.
dc.contributor.authorGrisé, F.
dc.contributor.authorParagi, Z.
dc.contributor.authorCorbel, S.
dc.contributor.authorFalcke, H.
dc.contributor.authorFrey, S.
dc.contributor.authorKaaret, P.
dc.contributor.authorKörding, E.
dc.date.accessioned2017-01-30T12:59:15Z
dc.date.available2017-01-30T12:59:15Z
dc.date.created2015-10-29T04:09:32Z
dc.date.issued2015
dc.identifier.citationCseh, D. and Miller-Jones, J. and Jonker, P. and Grisé, F. and Paragi, Z. and Corbel, S. and Falcke, H. et al. 2015. The evolution of a jet ejection of the ultraluminous X-ray source Holmberg II X-1. Monthly Notices of the Royal Astronomical Society. 452 (1): pp. 24-31.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/27472
dc.identifier.doi10.1093/mnras/stv1308
dc.description.abstract

We present quasi-simultaneous, multi-epoch radio and X-ray measurements of Holmberg II X-1 using the European VLBI Network (EVN), the Karl G. Jansky Very Large Array (VLA), and the Chandra and Swift X-ray telescopes. The X-ray data show apparently hard spectra with steady X-ray luminosities four months apart from each other. In the high-resolution EVN radio observations, we have detected an extended milliarcsecond scale source with unboosted radio emission. The source emits non-thermal, likely optically thin synchrotron emission, and its morphology is consistent with a jet ejection. The 9-GHz VLA data show an arcsecond-scale triple structure of Holmberg II X-1 similar to that seen at lower frequencies. However, we find that the central ejection has faded by at least a factor of 7.3 over 1.5 yr. We estimate the dynamical age of the ejection to be higher than 2.1 yr. We show that such a rapid cooling can be explained with simple adiabatic expansion losses. These properties of Holmberg II X-1 imply that ULX radio bubbles may be inflated by ejecta instead of self-absorbed compact jets.

dc.publisherOxford University Press
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT140101082
dc.titleThe evolution of a jet ejection of the ultraluminous X-ray source Holmberg II X-1
dc.typeJournal Article
dcterms.source.volume452
dcterms.source.number1
dcterms.source.startPage24
dcterms.source.endPage31
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access


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