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    XMM-Newton and Chandra X-ray follow-up observations of the VHE gamma-ray source HESS J1507-622

    Access Status
    Open access via publisher
    Authors
    Tibolla, Omar
    Kaufmann, S.
    Kosack, K.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tibolla, O. and Kaufmann, S. and Kosack, K. 2014. XMM-Newton and Chandra X-ray follow-up observations of the VHE gamma-ray source HESS J1507-622. Astronomy and Astrophysics. 567: Article ID A74.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201321778
    ISSN
    0004-6361
    URI
    http://hdl.handle.net/20.500.11937/26635
    Collection
    • Curtin Research Publications
    Abstract

    The discovery of the unique source HESS J1507-622 in the very high energy (VHE) range (100 GeV-100 TeV) opened newpossibilities to study the parent population of ultra-relativistic particles found in astrophysical sources and underlined the possibilityof new scenarios/mechanisms crucial for understanding the underlying astrophysical processes in nonthermal sources.Aims. The follow-up X-ray (0.2-10 keV) observations on HESS J1507-622 are reported, and possibilities regarding the nature of theVHE source and that of the newly discovered X-ray sources are investigated.Methods. We obtained observations with the X-ray satellites XMM-Newton and Chandra. Background corrections were applied tothe data to search for extended diffuse emission. Since HESS J1507-622 covers a large part of the field of view of these instruments,blank-sky background fields were used.Results. The discovery of several new X-ray sources and a new, faint, extended X-ray source with a flux of ~6×10-14 erg cm-2 s-1 isreported. Interestingly, a new, variable point-like X-ray source with a flux of ~8×10-14 erg cm-2 s-1 appeared in the 2011 observation,which was not detected in the previous X-ray observations.Conclusions. The X-ray observations revealed a faint, extended X-ray source that may be a possible counterpart for HESS J1507-622.This source could be an X-ray pulsar wind nebula (PWN) remnant of the larger gamma-ray PWN, which is still bright in IC emission.Several interpretations are proposed to explain the newly detected variable X-ray source.

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