Kyoto University · 물리·천문학
Shoji Ogawa 교수의 연구실은 활성은하핵(AGN)의 X선 및 적외선 스펙트럼을 고해상도로 분석하여, 은하핵 주변의 다공성 먼지 토러스와 열린 가스 구조의 물리적 성질을 규명하는 데 초점을 맞추고 있습니다. 특히 XCLUMPY 모델을 활용해 AGN의 에드링턴 비율과 토러스 덮개율 간의 상관관계를 규명하고, NuSTAR, XRISM, XMM-Newton 등의 우주 망원경 데이터를 기반으로 고해상도 스펙트럼 분석을 수행합니다. 또한, 온난한 흡수체와 방출선의 이オン화 상태 분포를 Cloudy 코드로 시뮬레이션하여 AGN의 가스 흐름과 복사압에 의한 기체 분출 메커니즘을 탐구합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract We present the results of a systematic, broadband X-ray spectral analysis of nearby active galactic nuclei (AGNs) with the X-ray clumpy torus model (XCLUMPY). By adding 16 AGNs newly analyzed in this paper, we study a total of 28 AGNs, including unabsorbed and absorbed AGNs taken from Ichikawa et al. and García-Bernete et al. This is the largest sample whose X-ray and infrared spectra are analyzed by the clumpy torus models XCLUMPY and CLUMPY, respectively. The relation between the Eddi
Abstract We apply a new X-ray clumpy torus model, XCLUMPY, in which the clump distribution is assumed to be the same as that in the infrared clumpy torus model (CLUMPY) by Nenkova et al., to the broadband X-ray spectra of type-1 active galactic nuclei (AGNs) for the first time. We analyze the archival data of IC 4329A and NGC 7469 observed with NuSTAR / Suzaku and NuSTAR / XMM-Newton , respectively, whose infrared spectra were studied with CLUMPY by Ichikawa et al. and optical extinctions ( A V
Abstract To investigate the origins of the warm absorbers in active galactic nuclei (AGNs), we study the ionization-state structure of the radiation-driven fountain model in a low-mass AGN and calculate the predicted X-ray spectra utilizing the spectral synthesis code Cloudy . The spectra show many absorption and emission line features originating in the outflowing ionized gas. The O viii 0.654 keV lines are produced mainly in the polar region much closer to the supermassive black hole than the
Abstract We present the first high-resolution X-ray spectrum of NGC 7213 obtained with XRISM/Resolve, supported by simultaneous XMM-Newton, NuSTAR, and SOAR optical data. The XRISM spectrum resolves the neutral Fe K α into two components: a narrow core ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="normal">FWHM</mml:mi> <mml:mo>=</mml:mo> <mml:mn>65</mml:mn> <mml:msubsup> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <
The Kyoto University Digital Library makes images of the rare materials that it holds available to general public. While most of the pages consist of scanned images alone, some are accompanied by corresponding encoded text data. This report summarizes the principal parts of the procedures for producing image data. Demand for a well-designed interface grows as the amount of available digital data expands, as the Internet environment develops with easier access to digital contents and as high-qual
