Isolated X-ray-infrared sources in the region of interaction of the supernova remnant IC 443 with a molecular cloud

A. M. Bykov, A. M. Krassilchtchikov, Yu A. Uvarov, H. Bloemen, F. Bocchino, G. M. Dubner, E. B. Giacani, G. G. Pavlov

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The nature of the extended hard X-ray source XMMU J061804.3+222732 and its surroundings is investigated using XMM-Newton, Chandra, and Spitzer observations. This source is located in an interaction region of the IC 443 supernova remnant with a neighboring molecular cloud. The X-ray emission consists of a number of bright clumps embedded in an extended structured nonthermal X-ray nebula larger than 30″ in size. Some clumps show evidence for line emission at ∼1.9 and ∼3.7 keV at the 99% confidence level. Large-scale diffuse radio emission of IC 443 passes over the source region, with an enhancement near the source. An IR source of about 14″ × 7″ size is prominent in the 24, 70, and 2.2 μm bands, adjacent to a putative Si K-shell X-ray line emission region. The observed IR/X-ray morphology and spectra are consistent with those expected for J/C-type shocks of different velocities driven by fragmented supernova ejecta colliding with the dense medium of a molecular cloud. The IR emission of the source detected by Spitzer can be attributed to both continuum emission from an H II region created by the ejecta fragment and line emission excited by shocks. This source region in IC 443 may be an example of a rather numerous population of hard X-ray/IR sources created by supernova explosions in the dense environment of star-forming regions. Alternative Galactic and extragalactic interpretations of the observed source are also discussed.

Original languageEnglish (US)
Pages (from-to)1050-1063
Number of pages14
JournalAstrophysical Journal
Issue number2
StatePublished - Apr 1 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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