The eROSITA Final Equatorial-Depth Survey (eFEDS)

Journal Article · 18 May 2022 · Astronomy and Astrophysics

DOI: https://doi.org/10.1051/0004-6361/202141092 · OSTI ID:1982282

Brusa, M. ^[1]; Urrutia, T. ^[2]; Toba, Y. ^[3]; Buchner, J. ^[4]; Li, J. -Y. ^[5]; Liu, T. ^[4]; Perna, M. ^[6]; Salvato, M. ^[7]; Merloni, A. ^[4]; Musiimenta, B. ^[1]; Nandra, K. ^[4]; Wolf, J. ^[7]; Arcodia, R. ^[4]; Dwelly, T. ^[4]; Georgakakis, A. ^[8]; Goulding, A. ^[9]; Matsuoka, Y. ^[10]; Nagao, T. ^[10]; Schramm, M. ^[11]; Silverman, J. D. ^[12] ; Terashima, Y. ^[10]

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1. University of Bologna (Italy); Istituto Nazionale di Astrofisica (INAF) (Italy)
2. Leibniz Institute for Astrophysics Potsdam (Germany)
3. Kyoto Univ. (Japan); Academia Sinica, Taipei (Taiwan); Ehime Univ., Matsuyama (Japan)
4. Max Planck Inst. fuer Extraterrestrische Physik, Garching (Germany)
5. Univ. of Science and Technology of China, Hefei (China); Univ. of Tokyo (Japan)
6. National Institute of Aerospace Technology (INTA) (Spain). Spanish Astrobiology Center; Istituto Nazionale di Astrofisica (INAF), Firenze (Italy)
7. Max Planck Inst. fuer Extraterrestrische Physik, Garching (Germany); Exzellenzcluster ORIGINS (Germany)
8. National Observatory of Athens (Greece)
9. Princeton Univ., NJ (United States)
10. Ehime Univ., Matsuyama (Japan)
11. National Astronomical Observatory of Japan (Japan)
12. Univ. of Tokyo (Japan)

Theoretical models of the co-evolution of galaxies and active galactic nuclei (AGNs) ascribe an important role in the feedback process to a short, luminous, obscured, and dust-enshrouded phase during which the accretion rate of the supermassive black hole is expected to be at its maximum and the associated AGN-driven winds are also predicted to be maximally developed. Here, to test this scenario, we have isolated a textbook candidate from the eROSITA Final Equatorial-Depth Survey (eFEDS) obtained within the performance and verification program of the eROSITA telescope on board the Spectrum Röntgen Gamma mission. From an initial catalogue of 246 hard X-ray selected sources that are matched with the photometric and spectroscopic information available within the eROSITA and Hyper Suprime-Cam consortia, three candidates quasars in the feedback phase have been isolated applying a diagnostic proposed previously. Only one source (eFEDS J091157.4+014327) has a spectrum already available (from SDSS-DR16, z = 0.603) and it unambiguously shows abroad component (full width at half maximum ~1650 kms^–1) in the [OIII]5007 line. The associated observed L_[OIII] is ~2.6 × 10⁴² erg s^–1, one to two orders of magnitude higher than that observed in local Seyfert galaxies and comparable to those observed in a sample of z ~ 0.5 type 1 quasars. From the multi-wavelength data available, we derive an Eddington ratio (L_bol/L_Edd) of ~0.25 and a bolometric correction in the hard X-ray band of k_bol ~ 10, which is lower than the corrections observed for objects at similar bolometric luminosity. These properties, along with the outflow, the high X-ray luminosity, the moderate X-ray obscuration (L_X~10^44.8 erg s^–1, N_H~2.7 × 10²² cm^–2), and the red optical colour, all match the prediction of quasars in the feedback phase from merger-driven models. Forecasting to the full eROSITA all-sky survey with its spectroscopic follow-up, we predict that by the end of 2024, we will have a sample of few hundred such objects at z= 0.5–2.

• Research Organization: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
• Sponsoring Organization: USDOE Office of Science (SC); Alfred P. Sloan Foundation; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
• Contributing Organization: Los Alamos National Laboratory (LANL)
• OSTI ID: 1982282
• Journal Information: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 661; ISSN 0004-6361
• Publisher: EDP SciencesCopyright Statement
• Country of Publication: United States
• Language: English