2024
X-Ray View of Little Red Dots: Do They Host Supermassive Black Holes?
Ananna T, Bogdán Á, Kovács O, Natarajan P, Hickox R. X-Ray View of Little Red Dots: Do They Host Supermassive Black Holes? The Astrophysical Journal Letters 2024, 969: l18. DOI: 10.3847/2041-8213/ad5669.Peer-Reviewed Original ResearchSupermassive black holesStellar mass estimatesBlack holeMass estimatesSMBH massHa emissionAccreting supermassive black holesHost supermassive black holesEddington-limited accretionMass upper limitIntense star formationOvermassive black holesVirial mass estimatesX-ray emissionLensing galaxy clustersChandra observationsChandra dataEddington limitStellar massGalaxy clustersHigher redshiftsStar formationLensing magnificationVirial relationIndividual galaxiesA Candidate Supermassive Black Hole in a Gravitationally Lensed Galaxy at Z ≈ 10
Kovács O, Bogdán Á, Natarajan P, Werner N, Azadi M, Volonteri M, Tremblay G, Chadayammuri U, Forman W, Jones C, Kraft R. A Candidate Supermassive Black Hole in a Gravitationally Lensed Galaxy at Z ≈ 10. The Astrophysical Journal Letters 2024, 965: l21. DOI: 10.3847/2041-8213/ad391f.Peer-Reviewed Original ResearchSupermassive black holesActive galactic nucleiBlack holeLuminosity functionAGN luminosity functionX-ray active galactic nucleusCollapse of massive starsSupermassive black holes formDeep Chandra observationsEarly cosmic epochsEddington-limited accretionGravitationally lensed galaxiesHigh-redshift galaxiesHigh-redshift quasarsBH candidatesChandra observationsSMBH populationBolometric luminosityGalactic nucleiMassive starsRedshift zCosmic epochsFormation epochLensing galaxyFormation scenario
2018
Searching for the 3.5 keV Line in the Deep Fields with Chandra: The 10 Ms Observations
Cappelluti N, Bulbul E, Foster A, Natarajan P, Urry M, Bautz M, Civano F, Miller E, Smith R. Searching for the 3.5 keV Line in the Deep Fields with Chandra: The 10 Ms Observations. The Astrophysical Journal 2018, 854: 179. DOI: 10.3847/1538-4357/aaaa68.Peer-Reviewed Original ResearchSterile neutrino decaysGalactic centerNeutrino decayCosmic X-ray backgroundNavarro-Frenk-White profileDark matter distributionMarkov chain Monte CarloMs Chandra observationsX-ray backgroundMilky WayGalaxy clustersChandra observationsDeep FieldSurvey fieldsKeV lineCharge exchangeEmission linesMatter distributionStatistical fluctuationsMS observationsInstrumental originLine intensitiesObserved linesKeVMonte Carlo
2017
The Chandra COSMOS Legacy Survey: Energy Spectrum of the Cosmic X-Ray Background and Constraints on Undetected Populations
Cappelluti N, Li Y, Ricarte A, Agarwal B, Allevato V, Ananna T, Ajello M, Civano F, Comastri A, Elvis M, Finoguenov A, Gilli R, Hasinger G, Marchesi S, Natarajan P, Pacucci F, Treister E, Urry C. The Chandra COSMOS Legacy Survey: Energy Spectrum of the Cosmic X-Ray Background and Constraints on Undetected Populations. The Astrophysical Journal 2017, 837: 19. DOI: 10.3847/1538-4357/aa5ea4.Peer-Reviewed Original ResearchSpectral index γBlack holesCosmic X-ray background spectrumIndex γCosmic X-ray backgroundX-ray background spectrumX-ray-detected sourcesStar-forming galaxiesActive galactic nucleiKeV energy bandX-ray backgroundEarly black holesLow-metallicity environmentsX-ray sourcesUndetected galaxiesExtragalactic componentGalactic nucleiChandra observationsFaint galaxiesHard spectrumUnresolved sourcesLegacy SurveyPower lawEnergy spectrumThermal plasma
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