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Katsuji Koyama, Tatsuya Inui, Yoshiaki Hyodo, Hironori Matsumoto, Takeshi Go Tsuru, Yoshitomo Maeda, Hiroshi Murakami, Shigeo Yamauchi, Steven E. Kissel, Kai-Wing Chan, Yang Soong, Discoveries of Diffuse Iron Line Sources from the Sgr B Region, Publications of the Astronomical Society of Japan, Volume 59, Issue sp1, 30 January 2007, Pages S221–S227, https://doi.org/10.1093/pasj/59.sp1.S221
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Abstract
The radio complex Sgr B region was observed with the X-ray Imaging Spectrometer (XIS) on board Suzaku. This region exhibits diffuse iron lines at 6.4, 6.7, and 6.9 keV, which are |$\mathrm{K}\alpha$| lines of Fe I (neutral iron), Fe XXV (He-like iron), and Fe XXVI (H-like iron), respectively. The high energy resolving power of the XIS provided separate maps of the K-shell transition lines from Fe I (6.4 keV) and Fe XXV (6.7 keV). Although the 6.7 keV line is smoothly distributed over the Sgr B region, a local excess is found near |$(l, b) = ({0\rlap {.}{}^{\mathrm {\circ }}61}, {0\rlap {.}{}^{\mathrm {\circ }}01})$|, possibly due to a new SNR. The plasma temperature is |$kT\sim 3 \,\mathrm{keV}$| and the age is estimated to be younger than |$7 \times 10^{3} \,\mathrm{yr}$|. The 6.4 keV image is clumpy with local excesses near Sgr B2 and at |$(l, b) = ({0\rlap {.}{}^{\mathrm {\circ }}74},- {0\rlap {.}{}^{\mathrm {\circ }}09})$|. Like Sgr B2, this excess may be another candidate of an X-ray reflection nebula.
