2019
The clustering of undetected high-redshift black holes and their signatures in cosmic backgrounds
Ricarte A, Pacucci F, Cappelluti N, Natarajan P. The clustering of undetected high-redshift black holes and their signatures in cosmic backgrounds. Monthly Notices Of The Royal Astronomical Society 2019, 489: 1006-1022. DOI: 10.1093/mnras/stz1891.Peer-Reviewed Original ResearchBlack hole growthBlack hole populationBlack holesHole growthHole populationCosmic X-ray backgroundBlack hole mass densityHigh-redshift black holesMassive black holesX-ray backgroundCosmic infrared backgroundSemi-analytic modelHalo massCosmic backgroundHydrodynamical simulationsArcminute scalesModerate redshiftsGalactic foregroundsInfrared backgroundWarm dustBinary emissionEarly epochsUndetected sourcesCoherent fluctuationsMass density
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
2013
The Multiwavelength AGN Population and the X-ray Background
Treister E, Urry C, Schawinski K, Simmons B, Natarajan P, Volonteri M. The Multiwavelength AGN Population and the X-ray Background. Proceedings Of The International Astronomical Union 2013, 9: 188-194. DOI: 10.1017/s1743921314003731.Peer-Reviewed Original ResearchBlack hole growthSupermassive black holesTotal black hole growthCosmic X-ray backgroundX-ray backgroundHole growthBlack holesDeep X-ray observationsMajor galaxy mergersTypes of galaxiesX-ray observationsPopulation synthesis modelsX-ray emissionMass densityMajor galaxiesAGN activityGalaxy candidatesGalaxy mergersGalaxy formationSMBH growthAGN populationCosmic historyBolometric luminosityLow luminosityAccretion episodes
2000
Stellar contributors to the hard X-ray background?
Natarajan P, Almaini O. Stellar contributors to the hard X-ray background? Monthly Notices Of The Royal Astronomical Society 2000, 318: l21-l24. DOI: 10.1046/j.1365-8711.2000.03842.x.Peer-Reviewed Original ResearchMassive X-ray binariesHard X-ray backgroundX-ray backgroundActive galactic nucleiX-ray binariesCosmic X-ray backgroundGlobal star formation rateHard X-ray emissionDistant starburst galaxiesStar-forming galaxiesStar formation rateX-ray emissionSimple energetic argumentsGalactic nucleiStarburst galaxiesFaint fluxesSupernova remnantsIntegrated fluxFormation rateEnergetic argumentsGalaxiesSupernovaeSignificant fractionBinariesViable candidate
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