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Title: SUZAKU DISCOVERY OF THE STRONG RADIATIVE RECOMBINATION CONTINUUM OF IRON FROM THE SUPERNOVA REMNANT W49B
Authors: Ozawa, M.
Koyama, K.
Yamaguchi, H.
Masai, K.
Tamagawa, T.
Author's alias: 小澤, 碧
Keywords: ISM: individual (W49B)
radiation mechanisms: thermal
supernova remnants
X-rays: ISM
Issue Date: 30-Nov-2009
Publisher: The American Astronomical Society
Journal title: The Astrophysical Journal
Volume: 706
Issue: 1
Start page: L71
End page: L75
Abstract: We present a hard X-ray spectrum of unprecedented quality of the Galactic supernova remnant (SNR) W49B obtained with the Suzaku satellite. The spectrum exhibits an unusual structure consisting of a saw-edged bump above 8 keV. This bump cannot be explained by any combination of high-temperature plasmas in ionization equilibrium. We firmly conclude that this bump is caused by the strong radiative recombination continuum (RRC) of iron, detected for the first time in a SNR. The electron temperature derived from the bremsstrahlung continuum shape and the slope of the RRC is ~1.5 keV. On the other hand, the ionization temperature derived from the observed intensity ratios between the RRC and Kα lines of iron is ~2.7 keV. These results indicate that the plasma is in a highly overionized state. Volume emission measures independently determined from the fluxes of the thermal and RRC components are consistent with each other, suggesting the same origin of these components.
Rights: © 2009 The American Astronomical Society
URI: http://hdl.handle.net/2433/139435
DOI(Published Version): 10.1088/0004-637X/706/1/L71
Appears in Collections:Journal Articles

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