2025
Multimessenger Probes of Supermassive Black Hole Spin Evolution
Ricarte A, Natarajan P, Narayan R, Palumbo D. Multimessenger Probes of Supermassive Black Hole Spin Evolution. The Astrophysical Journal 2025, 980: 136. DOI: 10.3847/1538-4357/ad9ea9.Peer-Reviewed Original ResearchLaser Interferometer Space AntennaSpin distributionSpin-downAccretion flowNext-generation Event Horizon TelescopeEvolution of supermassive black holesGeneral relativistic magnetohydrodynamic simulationsX-ray reflection spectroscopySupermassive black holesEvent Horizon TelescopeObserved spin distributionModulating spinRelativistic jetsAccretion diskGravitational wavesBlack holeCosmic timeMagnetohydrodynamic simulationsEvent horizonAccretion rateSpace AntennaCoherent accretionSpinning objectAccretionSpin
2024
Astrometric Jitter as a Detection Diagnostic for Recoiling and Slingshot Supermassive Black Hole Candidates
Uppal A, Ward C, Gezari S, Natarajan P, Chen N, LaChance P, Di Matteo T. Astrometric Jitter as a Detection Diagnostic for Recoiling and Slingshot Supermassive Black Hole Candidates. The Astrophysical Journal 2024, 975: 286. DOI: 10.3847/1538-4357/ad7ff0.Peer-Reviewed Original ResearchActive galactic nucleiSupermassive black holesLegacy Survey of Space and TimeAstrometric jitterPan-STARRS1Evolution of binary supermassive black holesBinary supermassive black holesSupermassive black hole candidatesGravitational wave recoilKeck LRIS spectroscopyBlack hole candidatesInner accretion diskSpace and TimeOptical survey dataGalactic centerGalactic nucleiAccretion diskGalaxy mergersSlingshot mechanismAGN candidatesBlack holeSpin evolutionLegacy SurveyMagnitude limitStudy feedback effects
2012
Probing quasar shutdown timescales with Hanny's Voorwerp
Evans D, Schawinski K, Virani S, Urry C, Keel W, Natarajan P, Lintott C, Manning A, Coppi P, Kaviraj S, Bamford S, Józsa G, Garrett M, van Arkel H, Gay P, Fortson L. Probing quasar shutdown timescales with Hanny's Voorwerp. AIP Conference Proceedings 2012, 1427: 193-200. DOI: 10.1063/1.3696176.Peer-Reviewed Original ResearchSupermassive black holesHanny's VoorwerpBlack holesXMM-Newton X-ray observationsPhysics of accretionCenters of galaxiesX-ray observationsBlack hole transitionGalaxy formationQuasar phaseIC 2497Light echoesHole transitionsAccretion diskRadiative outputIndividual quasarsFirst measurementOrders of magnitudeSuch phasesHolesTimescalesGalaxiesSuzakuQuasarsTransition
2010
THE SUDDEN DEATH OF THE NEAREST QUASAR
Schawinski K, Evans D, Virani S, Urry C, Keel W, Natarajan P, Lintott C, Manning A, Coppi P, Kaviraj S, Bamford S, Józsa G, Garrett M, van Arkel H, Gay P, Fortson L. THE SUDDEN DEATH OF THE NEAREST QUASAR. The Astrophysical Journal Letters 2010, 724: l30-l33. DOI: 10.1088/2041-8205/724/1/l30.Peer-Reviewed Original ResearchSupermassive black holesBlack holesPhysics of accretionCenters of galaxiesX-ray observationsBlack hole transitionGalaxy formationQuasar phaseHanny's VoorwerpIC 2497Light echoesHole transitionsAccretion diskRadiative outputIndividual quasarsFirst measurementOrders of magnitudeQuasarsSuch phasesHolesGalaxiesTimescalesTransitionPhysicsEnergy output
1999
Lense-Thirring Precession of Accretion Disks around Compact Objects
Armitage P, Natarajan P. Lense-Thirring Precession of Accretion Disks around Compact Objects. The Astrophysical Journal 1999, 525: 909-914. DOI: 10.1086/307955.Peer-Reviewed Original ResearchInner diskCompact objectsAccretion diskX-ray light curveGalactic black hole systemsLow-frequency quasi-periodic oscillationsBlack hole systemsQuasi-periodic oscillationsLense–Thirring precessionTime-dependent calculationsMisaligned accretion discNeutron starsCoherent precessionHole systemsLight curvesDamping rateDifferential precessionViscous timeDisk modelPrecessionDecay rateCoherent signalsRotating objectLenseFluid disks
1998
The Alignment of Disk and Black Hole Spins in Active Galactic Nuclei
Natarajan P, Pringle J. The Alignment of Disk and Black Hole Spins in Active Galactic Nuclei. The Astrophysical Journal 1998, 506: l97-l100. DOI: 10.1086/311658.Peer-Reviewed Original ResearchActive galactic nucleiBlack holesAngular momentumGalactic nucleiInner diskAccretion diskRadio-loud active galactic nucleiOuter accretion diskBlack hole spinBardeen–Petterson effectJet directionThird lawHost galaxiesHole spinGravitational potentialSpinHolesMomentumNewton's third lawJetDiskInner partGalaxiesTimescalesNucleus
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