Chandra Survey in the AKARI deep field at the North Ecliptic Pole: Optical and near-infrared identifications of X-ray sources
Por:
Miyaji T., Bravo-Navarro B.A., Tello J.D., Krumpe M., Herrera-Endoqui M., Ikeda H., Takagi T., Oi N., Shogaki A., Matsuura S., Kim H., Malkan M.A., Hwang H.S., Kim T., Ishigaki T., Hanami H., Kim S.J., Ohyama Y., Goto T., Matsuhara H.
Publicada:
1 ene 2024
Resumen:
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 ~0.34 deg2 and with 0.5-2 keV flux limits ranging between ~2-20 × 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 Ks 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-Ks 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 Ks 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 (Ks 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. © The Authors 2024.
Filiaciones:
Miyaji T.:
Instituto de Astronomía, Universidad Nacional Autónoma de México Campus Ensenada, A.P. 106 BC, Ensenada, 22800, Mexico
Bravo-Navarro B.A.:
Instituto de Astronomía, Universidad Nacional Autónoma de México Campus Ensenada, A.P. 106 BC, Ensenada, 22800, Mexico
Tello J.D.:
Instituto de Astronomía, Universidad Nacional Autónoma de México Campus Ensenada, A.P. 106 BC, Ensenada, 22800, Mexico
Preuniversitario UC, Pontificia Universidad Católica de Chile, Chile
Krumpe M.:
Leibniz-Institut fur Astrophysik Potsdam, An der Sternwarte 16, Potsdam, 14482, Germany
Herrera-Endoqui M.:
Instituto de Astronomía, Universidad Nacional Autónoma de México Campus Ensenada, A.P. 106 BC, Ensenada, 22800, Mexico
Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70-264 CDMX, Ciudad de México, 04510, Mexico
Ikeda H.:
National Institute of Technology, Wakayama College, 77 Noshima, Nada-cho, Gobo, Wakayama, 644-0023, Japan
Takagi T.:
Japan Space Forum 3-2-1 Kandasurugadai, Chiyoda-ku, Tokyo, 101-0062, Japan
Oi N.:
Space Information Center, Hokkaido Information University, Nishi-Nopporo 59-2, Ebetsu, Hokkaido, 069-8585, Japan
Shogaki A.:
Department of Physics, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
Matsuura S.:
Department of Physics, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
Kim H.:
University of California, Los Angeles, Division of Astronomy and Astrophysics, 430 Portola Plaza, Los Angeles, 90095-1547, CA, United States
Malkan M.A.:
University of California, Los Angeles, Division of Astronomy and Astrophysics, 430 Portola Plaza, Los Angeles, 90095-1547, CA, United States
Hwang H.S.:
Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
Snu Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
Kim T.:
Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
Snu Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
Ishigaki T.:
Iwate University, 3-18-8 Ueda, Morioka, Iwate, 020-8550, Japan
Hanami H.:
Iwate University, 3-18-8 Ueda, Morioka, Iwate, 020-8550, Japan
Kim S.J.:
Institute of Astronomy, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
Ohyama Y.:
Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan
Goto T.:
Institute of Astronomy, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, 30013, Taiwan
Matsuhara H.:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, 229-8510, Japan
The Graduate University for Advanced Studies, SOKENDAI, Shonan Village, Hayama, Kanagawa, 240-0193, Japan
hybrid, All Open Access; Hybrid Gold Open Access
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