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- Title
X-ray spectroscopy of the mixed morphology supernova remnant W 28 with XMM-Newton.
- Authors
Nakamura, Ryoko; Bamba, Aya; Ishida, Manabu; Yamazaki, Ryo; Tatematsu, Ken'ichi; Kohri, Kazunori; Pühlhofer, Gerd; Wagner, Stefan J.; Sawada, Makoto
- Abstract
We report on spatially resolved X-ray spectroscopy of the north-eastern part of the mixed morphology supernova remnant (SNR) W 28 with XMM-Newton. The observed field of view includes a prominent and twisted shell emission forming the edge of this SNR as well as part of the center-filled X-ray emission brightening toward the south-west edge of the field of view. The shell region spectra are in general represented by an optically thin thermal plasma emission in collisional ionization equilibrium with a temperature of ∼ 0.3 keV and a density of ∼ 10 cm−3, which is much higher than the density obtained for inner parts. In contrast, we detected no significant X-ray flux from one of the TeV γ-ray peaks with an upper-limit flux of 2.1 × 10−14 erg cm−2 s−1 in the 2–10 keV band. The large flux ratio of TeV to X-ray, larger than 16, and the spatial coincidence of the molecular cloud and the TeV γ-ray emission site indicate that the TeV γ-ray of W 28 is π0-decay emission originating from collisions between accelerated protons and molecular cloud protons. Comparing the spectrum in the TeV band and the X-ray upper limit, we obtained a weak upper limit on the magnetic field strength B ≲ 1500 μG.
- Subjects
X-ray spectroscopy; SUPERNOVA remnants; XMM-Newton Observatory (Artificial satellite); THERMAL plasmas; MAGNETIC flux density
- Publication
Publications of the Astronomical Society of Japan, 2014, Vol 66, Issue 3, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psu031