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    The evolution of a jet ejection of the ultraluminous X-ray source Holmberg II X-1

    231980_232244.pdf (542.0Kb)
    Access Status
    Open access
    Authors
    Cseh, D.
    Miller-Jones, James
    Jonker, P.
    Grisé, F.
    Paragi, Z.
    Corbel, S.
    Falcke, H.
    Frey, S.
    Kaaret, P.
    Körding, E.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cseh, 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.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv1308
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    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.

    URI
    http://hdl.handle.net/20.500.11937/27472
    Collection
    • Curtin Research Publications
    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.

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