The X-ray statistical properties of dust-obscured galaxies detected by eROSITA

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Résumé

Context. The tight correlation between supermassive black hole (SMBH) and host galaxy masses suggests their coevolution. Dust-obscured galaxies (DOGs) are thought to represent this coevolution phase, with active galactic nuclei (AGNs) buried in dust and gas. Despite hosting rapidly growing SMBHs, the X-ray statistical properties of DOGs remain poorly understood due to their rarity and the lack of wide, uniformly sensitive X-ray surveys. Aims. We construct a sample of X-ray-detected DOGs in the eROSITA Final Equatorial Depth Survey (eFEDS) field and examine their X-ray statistical properties. Methods. To construct the DOGs sample, we combined data from the Subaru/HSC SSP (optical), VIKING (near-infrared), and WISE (mid-infrared) all-sky surveys. We then cross-matched the sample with eROSITA -detected sources to select X-ray-detected DOGs. Results. We report the discovery of 5738 IR-bright DOGs within the 60 deg 2 area covered by both eFEDS and VIKING, including 65 X-ray-detected DOGs (eFEDS-DOGs). Among these, 41 eFEDS-DOGs exhibit a near- to mid-IR power-law slope, indicating dust-obscured AGNs. Hydrogen column densities ( N H ) of eFEDS-DOGs span 10 20 < N H /cm −2 ≲ 10 23 , including even unobscured AGNs. Most IR-bright DOGs remain undetected in X-rays, implying heavy obscuration ( N H /cm −2 > 10 23 ). eFEDS-DOGs, identified via the wide-area eROSITA survey, represent a less obscured DOG phase, possibly tracing the decline of dust/gas obscuration due to AGN feedback such as gas stripping or outflows. Some eFEDS-DOGs deviate up to ∼1 dex below the L 6 μm – L 0.5 − 2 keV (abs, corr) relation, potentially indicating high Eddington ratios near the Eddington limit. This suggests that eFEDS-DOGs are promising candidates for rapidly growing black holes in an early AGN feedback phase.

Conservé avec la notice de tri, où il sert de preuve aux étiquettes ci-dessus.

La notice

Revue

Astronomy and Astrophysics

Thématique

Galaxies: Formation, Evolution, Phenomena

Domaine

Physics and Astronomy

Établissements canadiens

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Organismes subventionnaires

SLAC National Accelerator LaboratoryArgonne National LaboratoryPlanetary Science DivisionHigh Energy PhysicsDivision of Astronomical SciencesRussian Academy of SciencesEberhard Karls Universität TübingenScience and Technology Facilities CouncilLeibniz-GemeinschaftScience Mission DirectorateSmithsonian Astrophysical ObservatoryLawrence Berkeley National LaboratoryJet Propulsion LaboratoryLeibniz-Institut für Astrophysik PotsdamEötvös Loránd TudományegyetemCabinet Office, Government of JapanUniversity of Illinois at Urbana-ChampaignFermilabMax-Planck-Institut für AstronomieRheinische Friedrich-Wilhelms-Universität BonnNational Astronomical Observatory of JapanMax-Planck-GesellschaftDeutsche ForschungsgemeinschaftChinese Academy of SciencesAcademia SinicaOffice of ScienceIntegrated Electronics Engineering Center, Binghamton UniversityJapan Society for the Promotion of ScienceQueen's UniversityUniversity of EdinburghMinistry of Education, Culture, Sports, Science and TechnologyNational Central UniversitySpace Telescope Science InstituteUniversity of SussexUniversity of NottinghamNational Aeronautics and Space AdministrationUniversity College LondonQueen's University BelfastUniversity of CambridgeUniversity of ChicagoNational Energy Research Scientific Computing CenterUniversity of California, Los AngelesUniversity of PortsmouthPrinceton UniversityJohns Hopkins UniversityToray Science FoundationHigh Energy Accelerator Research OrganizationOhio State UniversityJapan Science and Technology AgencyUniversität HamburgCalifornia Institute of TechnologySmithsonian InstitutionU.S. Department of EnergyNational Science FoundationUniversity of MichiganFinanciadora de Estudos e ProjetosUniversity of PennsylvaniaDurham University

Mots-clés

Supermassive black holeGalaxyActive galactic nucleusQuasarStatistical analysisGalactic nucleiVirgo Cluster

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