-
Views
-
Cite
Cite
Hiroshi Nakajima, Takeshi Go Tsuru, Masayoshi Nobukawa, Hironori Matsumoto, Katsuji Koyama, Hiroshi Murakami, Atsushi Senda, Shigeo Yamauchi, X-Ray Reflection Nebulae with Large Equivalent Widths of the Neutral Iron K|$\alpha$| Line in the Sagittarius C Region, Publications of the Astronomical Society of Japan, Volume 61, Issue sp1, 30 January 2009, Pages S233–S240, https://doi.org/10.1093/pasj/61.sp1.S233
- Share Icon Share
Abstract
This paper reports on the first results of a Suzaku observation in the Sgr C region. We detected four diffuse clumps with strong line emission at 6.4 keV, K|$\alpha$| from neutral or low-ionized Fe. One of them, M359.38|$-$|0.00, was newly discovered with Suzaku. The X-ray spectra of the two bright clumps, M359.43|$-$|0.07 and M359.47|$-$|0.15, after subtracting the galactic center diffuse X-ray emission (GCDX), exhibit a strong K|$\alpha$| line from Fe i with large equivalent widths (|$EW$|s) of 2.0–2.2 keV and a clear K|$\beta$| of Fe i. The GCDX in the Sgr C region is composed of the 6.4 keV- and 6.7 keV-associated components. These were phenomenologically decomposed by taking relations between the |$EW$|s of the 6.4 keV and 6.7 keV lines. Then, the former |$EW$|s against the associated continuum in bright clump regions were estimated to be 2.4|$^{+2.3}_{-0.7}$|keV. Since the two different approaches give similar large |$EW$|s of 2 keV, we strongly suggest that the 6.4 keV clumps in the Sgr C region are due to X-ray reflection/fluorescence (the X-ray reflection nebulae).