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    • Chandra Survey in the AKARI Deep Field at the North Ecliptic Pole. Optical and Near-Infrared Identifications of X-ray Sources

    T. Miyaji, B. A. Bravo-Navarro,J. Diaz Tello,M. Krumpe,M. Herrera-Endoqui, H. Ikeda,T. Takagi, N. Oi, A. Shogaki, S. Matsuura, H. Kim,M. A. Malkan, H. S. Hwang, T. Kim,T. Ishigaki,H. Hanami,S. J. Kim,Y. Ohyama, T. Goto,H. Matsuhara

    ASTRONOMY & ASTROPHYSICS（2024）

    Univ Nacl Autonoma Mexico | Leibniz Inst Astrophys Potsdam | Natl Inst Technol | Japan Space Forum | Hokkaido Informat Univ | Kwansei Gakuin Univ | Univ Calif Los Angeles | Seoul Natl Univ | Iwate Univ | Natl Tsing Hua Univ | Acad Sin | Japan Aerosp Explorat Agcy

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    Abstract
    Aims. We present a catalog of optical and infrared (NIR) identifications (ID) of X-ray sources in the AKARI North Ecliptic Pole (NEP) deep field detected with Chandra, covering similar to 0.34 deg(2) and with 0.5-2 keV flux limits ranging between similar to 2-20 x 10(-16) erg s(-1) cm(-2). Methods. The optical/NIR counterparts of the X-ray sources were taken from our Hyper Suprime Cam (HSC)/Subaru and Wide-Field InfraRed Camera (WIRCam)/Canada-France-Hawaii Telescope (CFHT) data because these have much more accurate source positions due to their spatial resolution than those of Chandra and longer wavelength IR data. We concentrate our identifications in the HSC g band and WIRCam K-s band-based catalogs. To select the best counterpart, we utilized a novel extension of the likelihood-ratio (LR) analysis, where we used the X-ray flux as well as g-K-s colors to calculate the likelihood ratio. The spectroscopic and photometric redshifts of the counterparts are summarized in this work. In addition, simple X-ray spectroscopy was carried out on the sources with sufficient source counts. Results. We present the resulting catalog in an electronic form. The main ID catalog contains 403 X-ray sources and includes X-ray fluxes, luminosities, g and K-s band magnitudes, redshifts and their sources, and optical spectroscopic properties, as well as intrinsic absorption column densities and power-law indices from simple X-ray spectroscopy. The X-ray sources identified in this work include 27 Milky-Way objects, 57 type I AGNs, 131 other AGNs, and 15 galaxies. The catalog serves as a basis for further investigations of the properties of the X-ray and NIR sources in this field. Conclusions. We present a catalog of optical (g band) and NIR (K-s band) identifications of Chandra X-ray sources in the AKARI NEP Deep field with available optical/NIR spectroscopic features and redshifts as well as the results of simple X-ray spectroscopy. In the process, we developed a novel X-ray flux-dependent likelihood-ratio analysis for selecting the most likely counterparts among candidates.
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    methods: data analysis,catalogs,surveys,galaxies: active,X-rays: galaxies
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    【要点】：本文通过使用Chandra X射线望远镜与Hyper Suprime Cam (HSC)及Wide-Field InfraRed Camera (WIRCam)的数据，对AKARI北黄极深空视场中的X射线源进行了光学/近红外识别，提出了一种新的似然比分析方法，提高了X射线源识别的准确性。
    

    【方法】：作者使用了一种扩展的似然比分析，结合X射线流量和g - K_s颜色信息来确定最佳对应体，并总结了对应体的光谱学和光度红移。
    

    【实验】：该研究在AKARI北黄极深空视场进行了X射线源的识别，使用了Chandra数据覆盖约0.34平方度，0.5-2 keV流量限制在2 - 20× 10^-16 erg s^-1 cm^-2范围内，识别结果包括403个X射线源，并提供了电子形式的目录，其中包括X射线流量、亮度、g和K_s波段星等、红移等信息。
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