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Analysis of the 3C 445 soft X-ray spectrum as observed by Chandra high-energy gratings
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作者 Fu-Tong Dong shu-hua shao +1 位作者 Yan Cheng Jiao-Long Zeng 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2018年第5期59-68,共10页
We present a detailed analysis of the soft X-ray emission of 3 C 445 using an archival Chandra High Energy Transmission Grating(HETG) spectrum. Highly-ionized H-and He-like Mg, Si and S lines, as well as a resolved ... We present a detailed analysis of the soft X-ray emission of 3 C 445 using an archival Chandra High Energy Transmission Grating(HETG) spectrum. Highly-ionized H-and He-like Mg, Si and S lines, as well as a resolved low-ionized Si Kα line, are detected in the high resolution spectrum. The He-like triplets of Mg and Si are resolved into individual lines, and the calculated R ratios indicate a high density for the emitter. The low values of G ratios indicate the lines originate from collisionally ionized plasmas. However, the detection of a resolved narrow Ne X radiative recombination continua(RRC) feature in the spectrum seems to prefer a photoionized environment. The spectrum is subsequently modeled with a photoionization model, and the results are compared with those of a collisional model. Through a detailed analysis of the spectrum, we exclude a collisional origin for these emission lines. A one-component photoionization model provides a great fit to the emission features. The best-fit parameters are log ξ = 3.3^+0.4-0.3 erg cm s^-1, n H = 5^+15 -4.5× 10^10 cm^-3 and NH = 2.5^+3.8 -1.7× 10^20 cm^-2.According to the calculated high density for the emitter, the measured velocity widths of the emission lines and the inferred radial distance(6 × 10^14-8 × 10^15 cm), we suggest the emission lines originating from matter are located in the broad line region(BLR). 展开更多
关键词 GALAXIES active - X-rays galaxies - galaxies individual (3C 445)
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