X-Ray Observations of the Sagittarius D HII Region toward the Galactic Center with Suzaku - AstrophysicsReport as inadecuate




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Abstract: We present a Suzaku X-ray study of the Sagittarius D Sgr D HII region inthe Galactic center region. Two 18-x18- images by the X-ray ImagingSpectrometer XIS encompass the entire Sgr D complex. Thanks to the lowbackground, XIS discovered two diffuse sources with low surface brightness andobtained their high signal-to-noise ratio spectra. One is associated with thecore of the Sgr D HII region, arising from the young stellar cluster. The otheris a new object in the vicinity of the region. We also present 3.5 cm and 6.0cm radio continuum maps of the new source using the 100 m Green Bank Telescope.We conclude that the source is a new supernova remnant SNR; G1.2-0.0 basedon: 1 the 0.9+-0.2 keV thermal X-ray spectrum with emission lines fromhighly ionized atoms; 2 the diffuse nature with an apparent extent of ~10 pcat the Galactic center distance inferred from the X-ray absorption~8.5x10^{22} cm^{-2}; and 3 the nonthermal radio continuum spectral index~-0.5. Our discovery of an SNR in the Sgr D HII region leads to a revision ofthe view of this system, which had been considered to be a thermal HII regionand its environment.



Author: Makoto Sawada, Masahiro Tsujimoto, Katsuji Koyama, Casey J. Law, Takeshi Go Tsuru, Yoshiaki Hyodo

Source: https://arxiv.org/







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