TY - JOUR
T1 - The eROSITA Final Equatorial-Depth Survey (eFEDS)
T2 - An X-ray-bright, extremely luminous infrared galaxy at z = 1.87
AU - Toba, Yoshiki
AU - Brusa, Marcella
AU - Liu, Teng
AU - Buchner, Johannes
AU - Terashima, Yuichi
AU - Urrutia, Tanya
AU - Salvato, Mara
AU - Akiyama, Masayuki
AU - Arcodia, Riccardo
AU - Goulding, Andy D.
AU - Higuchi, Yuichi
AU - Inoue, Kaiki T.
AU - Kawaguchi, Toshihiro
AU - Lamer, Georg
AU - Merloni, Andrea
AU - Nagao, Tohru
AU - Ueda, Yoshihiro
AU - Nandra, Kirpal
N1 - Funding Information:
We gratefully acknowledge the anonymous referee for a careful reading of the manuscript and very helpful comments. We thank Takashi Horiuch, Keiichi Wada, and Naomichi Yutani for useful discussion and comments. This work is based on data from eROSITA, the primary instrument aboard SRG, a joint Russian-German science mission supported by the Russian Space Agency (Roskosmos), in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI), and the Deutsches Zentrum für Luft- und Raumfahrt (DLR). The SRG spacecraft was built by Lavochkin Association (NPOL) and its subcontractors, and is operated by NPOL with support from the Max-Planck Institute for Extraterrestrial Physics (MPE). The development and construction of the eROSITA X-ray instrument was led by MPE, with contributions from the Dr. Karl Remeis Observatory Bamberg & ECAP (FAU Erlangen-Nuernberg), the University of Hamburg Observatory, the Leibniz Institute for Astrophysics Potsdam (AIP), and the Institute for Astronomy and Astrophysics of the University of Tübingen, with the support of DLR and the Max Planck Society. The Argelander Institute for Astronomy of the University of Bonn and the Ludwig Maximilians Universität Munich also participated in the science preparation for eROSITA. The eROSITA data shown here were processed using the eSASS/NRTA software system developed by the German eROSITA consortium. This work is supported by JSPS KAKENHI grant nos. 18J01050 and 19K14759 (Y. Toba), 16K05296 (Y. Terashima), 20H01949 (T. Nagao), and 20H01946 (Y. Ueda).
Funding Information:
cA knowledgements. We gratefully acknowledge the anonymous referee for a careful reading of the manuscript and very helpful comments. We thank Takashi Horiuch, Keiichi Wada, and Naomichi Yutani for useful discussion and comments. This work is based on data from eROSITA, the primary instrument aboard SRG, a joint Russian-German science mission supported by the Russian Space Agency (Roskosmos), in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI), and the Deutsches Zentrum für Luft-und Raumfahrt (DLR). The SRG spacecraft was built by Lav-ochkin Association (NPOL) and its subcontractors, and is operated by NPOL with support from the Max-Planck Institute for Extraterrestrial Physics (MPE). The development and construction of the eROSITA X-ray instrument was led by MPE, with contributions from the Dr. Karl Remeis Observatory Bamberg & ECAP (FAU Erlangen-Nuernberg), the University of Hamburg Observatory, the Leibniz Institute for Astrophysics Potsdam (AIP), and the Institute for Astronomy and Astrophysics of the University of Tübingen, with the support of DLR and the Max Planck Society. The Argelander Institute for Astronomy of the University of Bonn and the Ludwig Maximilians Universität Munich also participated in the science preparation for eROSITA. The eROSITA data shown here were processed using the eSASS/NRTA software system developed by the German eROSITA consortium. This work is supported by JSPS KAKENHI grant nos. 18J01050 and 19K14759 (Y. Toba), 16K05296 (Y. Terashima), 20H01949 (T. Nagao), and 20H01946 (Y. Ueda).
Publisher Copyright:
© ESO 2021.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - In this study, we investigate the X-ray properties of WISE J090924.01+000211.1 (WISEJ0909+0002), an extremely luminous infrared (IR) galaxy (ELIRG) at zspec = 1.871 in the eROSITA Final Equatorial-Depth Survey. WISEJ0909+0002 is a WISE 22 μm source, located in the GAMA-09 field, which was detected by eROSITA during the performance and verification phase. The corresponding optical spectrum indicates that this object is a type-1 active galactic nucleus (AGN). Observations from eROSITA combined with Chandra and XMM-Newton archival data indicate a very luminous (L (2-10 keV) = (2.1 ± 0.2) × 1045 erg s-1) unobscured AGN with a power-law photon index of Γ=1.73-0.15+0.16 and an absorption hydrogen column density of log (NH/cm-2) < 21.0. The IR luminosity was estimated to be LIR = (1.79 ± 0.09) × 1014 L⊙ from spectral energy distribution modeling based on 22 photometric data points (X-ray to far-IR) with X-CIGALE, which confirmed that WISEJ0909+0002 is an ELIRG. A remarkably high LIR despite very low NH would indicate that we are witnessing a short-lived phase in which hydrogen gas along the line of sight is blown outward, whereas warm and hot dust heated by AGNs still exists. As a consequence of the eROSITA All-Sky Survey, 6.8-5.6+16 × 102 such X-ray-bright ELIRGs are expected to be discovered in the entire extragalactic sky (|b| > 10°). This can potentially be the key population to constrain the bright end of IR luminosity functions.
AB - In this study, we investigate the X-ray properties of WISE J090924.01+000211.1 (WISEJ0909+0002), an extremely luminous infrared (IR) galaxy (ELIRG) at zspec = 1.871 in the eROSITA Final Equatorial-Depth Survey. WISEJ0909+0002 is a WISE 22 μm source, located in the GAMA-09 field, which was detected by eROSITA during the performance and verification phase. The corresponding optical spectrum indicates that this object is a type-1 active galactic nucleus (AGN). Observations from eROSITA combined with Chandra and XMM-Newton archival data indicate a very luminous (L (2-10 keV) = (2.1 ± 0.2) × 1045 erg s-1) unobscured AGN with a power-law photon index of Γ=1.73-0.15+0.16 and an absorption hydrogen column density of log (NH/cm-2) < 21.0. The IR luminosity was estimated to be LIR = (1.79 ± 0.09) × 1014 L⊙ from spectral energy distribution modeling based on 22 photometric data points (X-ray to far-IR) with X-CIGALE, which confirmed that WISEJ0909+0002 is an ELIRG. A remarkably high LIR despite very low NH would indicate that we are witnessing a short-lived phase in which hydrogen gas along the line of sight is blown outward, whereas warm and hot dust heated by AGNs still exists. As a consequence of the eROSITA All-Sky Survey, 6.8-5.6+16 × 102 such X-ray-bright ELIRGs are expected to be discovered in the entire extragalactic sky (|b| > 10°). This can potentially be the key population to constrain the bright end of IR luminosity functions.
KW - Galaxies: active
KW - Infrared: galaxies
KW - Quasars: individual: WISE J090924.01+000211.1
KW - X-rays: galaxies
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U2 - 10.1051/0004-6361/202140317
DO - 10.1051/0004-6361/202140317
M3 - Article
AN - SCOPUS:85105614738
SN - 0004-6361
VL - 649
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - L11
ER -