0000000000822329

AUTHOR

Michael A. Nowak

showing 11 related works from this author

First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring

2019

The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data. To this end, we construct a large library of models based on general relativistic magnetohydrodynamic (GRMHD) simulations and synthetic images produced by general relativistic ray tracing. We compare the observed visibilities with this library and confirm that the asymmetric ring is consistent with earlier predictions of strong gravitational lensing of synchrotron emission from a hot plasma orbiting near the black hole event horizon. The ring rad…

Magnetohydrodynamics (MHD)010504 meteorology & atmospheric sciencesindividual (M87) [galaxies]Event horizongalaxies: jetAstronomyStrong gravitational lensingblack hole physicsjets [galaxies]galaxies: individualAstrophysicsaccretion accretion disk01 natural sciencesGeneral Relativity and Quantum CosmologyGalaxies: individual (M87)accretion010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsaccretion accretion disksaccretion diskshigh angular resolution [techniques]Accretion disks(MHD)Astrophysics - High Energy Astrophysical PhenomenaGeneral relativityAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Compact stargalaxies: individual: M87magnetohydrodynamics (MHD)Techniques: high angular resolutionGeneral Relativity and Quantum Cosmology0103 physical sciences(M87)0105 earth and related environmental sciencesEvent Horizon TelescopeSupermassive black holeAstronomy and AstrophysicsBlack hole physicsAstrophysics - Astrophysics of Galaxiesblack hole physicBlack holeRotating black holeSpace and Planetary Sciencemagnetohydrodynamics: MHDGalaxies: jetsAstrophysics of Galaxies (astro-ph.GA)magnetohydrodynamics[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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On Relativistic Disk Spectroscopy in Compact Objects with X-ray CCD Cameras

2010

X-ray charge-coupled devices (CCDs) are the workhorse detectors of modern X-ray astronomy. Typically covering the 0.3-10.0 keV energy range, CCDs are able to detect photoelectric absorption edges and K shell lines from most abundant metals. New CCDs also offer resolutions of 30-50 (E/dE), which is sufficient to detect lines in hot plasmas and to resolve many lines shaped by dynamical processes in accretion flows. The spectral capabilities of X-ray CCDs have been particularly important in detecting relativistic emission lines from the inner disks around accreting neutron stars and black holes. One drawback of X-ray CCDs is that spectra can be distorted by photon "pile-up", wherein two or mor…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)PhotonSpectrometerAstrophysics::High Energy Astrophysical PhenomenaElectron shellFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGeneral Relativity and Quantum Cosmology (gr-qc)General Relativity and Quantum CosmologyRelativistic diskSpectral lineaccretion accretion disks black hole physics instrumentation spectrographs methods analytical X-rays binariesNeutron starSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary ScienceEmission spectrumAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaSpectroscopyAstrophysics::Galaxy Astrophysics
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First M87 Event Horizon Telescope Results. VII. Polarization of the Ring

2021

Full list of authors: Akiyama, Kazunori; Algaba, Juan Carlos; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.…

1663010504 meteorology & atmospheric sciences1346KinoAstrophysics - astrophysics of galaxiesAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesGalaxy accretion disks01 natural sciencesAstrophysics - high energy astrophysical phenomena2033Galaxies: individual: M87 1278 1346 1769 1663 16 2033 1859 5620103 physical sciencesPolarimetrySupermassive black holes1769010303 astronomy & astrophysicsAstronomy data modeling0105 earth and related environmental sciencesVery long baseline interferometryPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Active galactic nucleiGalaxies: individual: M871278F510ChatterjeeAstronomy and AstrophysicsCreative commons16562Low-luminosity active galactic nuclei13. Climate actionSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)Fish <Actinopterygii>Radio interferometryHumanities1859
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First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon

2021

Full list of authors: Akiyama, Kazunori; Algaba, Juan Carlos; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.…

AccretionKinoAstrophysics - astrophysics of galaxiesAstrophysics::High Energy Astrophysical PhenomenaAstronomy19641347FOS: Physical sciences479Astrophysics::Cosmology and Extragalactic AstrophysicsF500870126101 natural sciences7. Clean energyAstrophysics - high energy astrophysical phenomena994MagnetohydrodynamicsRelativistic jets 14 162 479 870 886 994 1964 1261 1278 1335 1347 13900103 physical sciencesJetsPolarimetryRadiative transferPlasma astrophysicsRadio jets010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics162High Energy Astrophysical Phenomena (astro-ph.HE)Physics1278Event horizons1335010308 nuclear & particles physicsBlack holesChatterjee14886Astronomy and AstrophysicsCreative commons139013. Climate actionSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)Magnetic fieldsKerr black holesFish <Actinopterygii>Relativistic jetsHumanities
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First M87 Event Horizon Telescope Results. I. the Shadow of the Supermassive Black Hole

2019

When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and study this phenomenon, we have assembled the Event Horizon Telescope, a global very long baseline interferometry array observing at a wavelength of 1.3 mm. This allows us to reconstruct event-horizon-scale images of the supermassive black hole candidate in the center of the giant elliptical galaxy M87. We have resolved the central compact radio source as an asymmetric bright emission ring with a diameter of 42 ± 3 μas, which is circular and encompasses a central depression in brightness with a flux rati…

010504 meteorology & atmospheric sciencesindividual (M87) [galaxies]Event horizonAstronomyblack hole physicsjets [galaxies]galaxies: individualAstrophysicshigh-resolution7. Clean energy01 natural sciencesPhoton sphereGeneral Relativity and Quantum Cosmologyaccretionsagittarius-a-asterisk010303 astronomy & astrophysicsgalactic-centerHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsradio-sourcesaccretion disksGalactic Centergrmhd simulations3. Good healthenergy-distributionsactive [galaxies]AnatomyAstrophysics - High Energy Astrophysical PhenomenaActive galactic nucleusAstrophysics::High Energy Astrophysical Phenomenagalaxies: activeFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics::Cosmology and Extragalactic Astrophysicsgalaxies: individual: M87galaxies: individual (M87)Cell and Developmental BiologyGeneral Relativity and Quantum Cosmology0103 physical sciences(M87)Astrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesEvent Horizon TelescopeSupermassive black holeghz vlbi observationsfaraday-rotationAstronomy and Astrophysicsgalaxies: jetsAstrophysics - Astrophysics of GalaxiesBlack holeRotating black holeSpace and Planetary SciencegravitationAstrophysics of Galaxies (astro-ph.GA)advection-dominated accretion[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]ionized-gas
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INTEGRAL/RXTE Observations of Cygnus X-1

2003

We present first results from contemporaneous observations of Cygnus X-1 with INTEGRAL and RXTE, made during INTEGRAL's performance verification phase in 2002 November and December. Consistent with earlier results, the 3-250 keV data are well described by Comptonization spectra from a Compton corona with a temperature of kT~50-90 keV and an optical depth of tau~1.0-1.3 plus reflection from a cold or mildly ionized slab with a covering factor of Omega/2pi~0.2-0.3. A soft excess below 10 keV, interpreted as emission from the accretion disk, is seen to decrease during the 1.5 months spanned by our observations. Our results indicate a remarkable consistency among the independently calibrated de…

Black hole physics ; Individual stars ; Cyg X-1 ; Gamma rays ; X-rays observations ; BinariesAstrophysics::High Energy Astrophysical PhenomenaPhase (waves)FOS: Physical sciencesFlux02 engineering and technologyAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsCyg X-101 natural sciencesOmegaSpectral lineIonizationIndividual stars0103 physical sciencesOptical depth (astrophysics)0202 electrical engineering electronic engineering information engineeringCalibration010303 astronomy & astrophysicsOptical depthPhysics010308 nuclear & particles physicsGamma raysBinariesAstrophysics (astro-ph)X-rays observationsGamma rayAstronomyAstronomy and Astrophysics020206 networking & telecommunicationsBlack hole physics:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]CoronaSpace and Planetary ScienceReflection (physics)020201 artificial intelligence & image processingUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]AIP Conference Proceedings
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Event Horizon Telescope imaging of the archetypal blazar 3C 279 at an extreme 20 microarcsecond resolution

2020

Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by Max Planck Society.--All authors: Kim, Jae-Young; Krichbaum, Thomas P.; Broderick, Avery E.; Wielgus, Maciek; Blackburn, Lindy; Gómez, José L.; Johnson, Michael D.; Bouman, Katherine L.; Chael, Andrew; Akiyama, Kazunori; Jorstad, Svetlana; Marscher, Alan P.; Issaoun, Sara; Janssen, Michael; Chan, Chi-kwan; Savolainen, Tuomas; Pesce, Dominic W.; Özel, Feryal; Alberdi, Antxon; Alef, Walt…

ACTIVE GALACTIC NUCLEIBrightnessActive galactic nucleusactive [Galaxies]Astrophysics::High Energy Astrophysical PhenomenaAstronomygalaxies: activeAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesSubmillimeter ArrayFLOWSSCALE CIRCULAR-POLARIZATION0103 physical sciencesVery-long-baseline interferometryBlazar010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsPhysicsEvent Horizon Telescope[PHYS]Physics [physics]Jet (fluid)010308 nuclear & particles physicsAstronomy and AstrophysicsFLAREgalaxies: jetsindividual: 3C 279 [Galaxies]LONGVARIABILITYgalaxies: individual: 3C 279GAMMA-RAYQUASARS13. Climate actionSpace and Planetary Sciencetechniques: interferometricBrightness temperatureACCRETION DISKSinterferometric [Techniques]jets [Galaxies]RELATIVISTIC JETS[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]Astronomy & astrophysics
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Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

2021

Full list of authors: EHT MWL Science Working Group; Algaba, J. C.; Anczarski, J.; Asada, K.; Baloković, M.; Chandra, S.; Cui, Y. -Z.; Falcone, A. D.; Giroletti, M.; Goddi, C.; Hada, K.; Haggard, D.; Jorstad, S.; Kaur, A.; Kawashima, T.; Keating, G.; Kim, J. -Y.; Kino, M.; Komossa, S.; Kravchenko, E. V.; Krichbaum, T. P.; Lee, S. -S.; Lu, R. -S.; Lucchini, M.; Markoff, S.; Neilsen, J.; Nowak, M. A.; Park, J.; Principe, G.; Ramakrishnan, V.; Reynolds, M. T.; Sasada, M.; Savchenko, S. S.; Williamson, K. E.; Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Anantua, Richard; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Barrett, John; Bintley, Dan; …

Accretion010504 meteorology & atmospheric sciencesAstronomyFluxAstrophysics7. Clean energy01 natural sciencesActive galactic nuclei; Radio cores; Low-luminosity active galactic nuclei; High energy astrophysics; Astrophysical black holes; Accretion; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsastro-ph.HERadio coreAccretion (meteorology)PhysicsAstrophysical black holes520 Astronomie und zugeordnete WissenschaftenActive galactic nuclei ; Radio cores ; Low-luminosity ; active galactic nuclei ; High energy astrophysics ; Astrophysical black holes ; AccretionAstrophysical black holeLow-luminosity active galactic nucleiastro-ph.COAstrophysics - High Energy Astrophysical PhenomenaAccretion; Active galactic nuclei; Astrophysical black holes; High energy astrophysics; Low-luminosity active galactic nuclei; Radio coresHigh energy astrophysicsRadio coresAstrophysics - Cosmology and Nongalactic AstrophysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Active galactic nucleusHigh-energy astronomyastro-ph.GAAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesF500Astrophysics::Cosmology and Extragalactic AstrophysicsHigh energy astrophysic0103 physical sciencesVery-long-baseline interferometryddc:530Astrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesEvent Horizon TelescopeSupermassive black holeActive galactic nucleiAstronomy and Astrophysics530 PhysikAstrophysics - Astrophysics of GalaxiesGalaxySpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)ddc:520Active galactic nuclei; Radio cores; Low-luminosity active galactic nuclei; High energy astrophysics; Astrophysical black holes; AccretionHESS - Abteilung Hinton[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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The Polarized Image of a Synchrotron-emitting Ring of Gas Orbiting a Black Hole

2021

Full list of authors: Narayan, Ramesh; Palumbo, Daniel C. M.; Johnson, Michael D.; Gelles, Zachary; Himwich, Elizabeth; Chang, Dominic O.; Ricarte, Angelo; Dexter, Jason; Gammie, Charles F.; Chael, Andrew A.; Event Horizon Telescope Collaboration; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Domini…

AstrofísicaCamps magnèticsAccretion010504 meteorology & atmospheric sciencesAstronomyAstrophysics::High Energy Astrophysical PhenomenaStrong gravitational lensingSynchrotron radiationFOS: Physical sciencesF50001 natural sciencesAstrophysics - high energy astrophysical phenomena994General Relativity and Quantum Cosmology0103 physical sciencesPolarimetrySchwarzschild metric010303 astronomy & astrophysics0105 earth and related environmental sciences162astro-ph.HEEvent Horizon TelescopePhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)1278Accretion (meteorology)Black holes14Astronomy and AstrophysicsPolarization (waves)Computational physicsMagnetic fieldBlack holeSpace and Planetary ScienceMagnetic fields14 162 1278 994
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Event Horizon Telescope observations of the jet launching and collimation in Centaurus A

2021

Full list of authors: Janssen, Michael; Falcke, Heino; Kadler, Matthias; Ros, Eduardo; Wielgus, Maciek; Akiyama, Kazunori; Baloković, Mislav; Blackburn, Lindy; Bouman, Katherine L.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Koushik; Davelaar, Jordy; Edwards, Philip G.; Fromm, Christian M.; Gómez, José L.; Goddi, Ciriaco; Issaoun, Sara; Johnson, Michael D.; Kim, Junhan; Koay, Jun Yi; Krichbaum, Thomas P.; Liu, Jun; Liuzzo, Elisabetta; Markoff, Sera; Markowitz, Alex; Marrone, Daniel P.; Mizuno, Yosuke; Müller, Cornelia; Ni, Chunchong; Pesce, Dominic W.; Ramakrishnan, Venkatessh; Roelofs, Freek; Rygl, Kazi L. J.; van Bemmel, Ilse; Event Horizon Telescope Collaboration.--This Open Access artic…

AstrofísicaActive galactic nucleusCosmology and Nongalactic Astrophysics (astro-ph.CO)010504 meteorology & atmospheric sciencesEvent horizonastro-ph.GAAstronomyAstrophysics::High Energy Astrophysical PhenomenaAstrophysics - astrophysics of galaxiesAstrophysics - cosmology and nongalactic astrophysicsCentaurus AFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesAstrophysics - high energy astrophysical phenomena0103 physical sciencesVery-long-baseline interferometry010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesAstronomia ObservacionsEvent Horizon TelescopePhysicsastro-ph.HEHigh Energy Astrophysical Phenomena (astro-ph.HE)Supermassive black holeJet (fluid)Galactic CenterAstronomy and AstrophysicsAstrophysics of Galaxies (astro-ph.GA)astro-ph.CO
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Constraints on black-hole charges with the 2017 EHT observations of M87*

2021

Full list of authors: Kocherlakota, Prashant; Rezzolla, Luciano; Falcke, Heino; Fromm, Christian M.; Kramer, Michael; Mizuno, Yosuke; Nathanail, Antonios; Olivares, Héctor; Younsi, Ziri; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; …

PhysicsGravitació010308 nuclear & particles physicsAstronomyKinoAstrophysics::High Energy Astrophysical Phenomenagr-qcChatterjeeFOS: Physical sciencesGeneral Relativity and Quantum Cosmology (gr-qc)Creative commons01 natural sciencesGeneral Relativity and Quantum Cosmology0103 physical sciencesAstronomiaFish <Actinopterygii>010306 general physicsGeneral relativity and quantum cosmologyHumanitiesPhysical Review D. Particles and Fields
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