0000000000313832

AUTHOR

Zong-hong Zhu

showing 3 related works from this author

Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs

2021

We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo detectors. For the first time, we include Virgo data in our analysis and run our search with a new efficient pipeline called {\tt PyStoch} on data folded over one sidereal day. We use gravitational-wave radiometry (broadband and narrow band) to produce sky maps of stochastic gravitational-wave backgrounds and to search for gravitational waves from point sources. A spherical harmonic decomposition method is employed to look for gravitational-wave emission from spatially-extended sources. Neither technique found eviden…

gravitational radiation: anisotropyPhysics and Astronomy (miscellaneous)gravitational radiation: stochasticAstronomyAstrophysics01 natural sciencesGeneral Relativity and Quantum CosmologyPhysics Particles & FieldsCosmology & Astrophysicsenergy: fluxenergy: densitygravitational radiation: energyLIGOQCQBPhysicsSettore FIS/01Spectral indexPhysicsGalactic CenterAmplitudeGeneral relativitySidereal timePhysical Sciences[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]gravitational radiation: power spectrumGravitationdata analysis methodAnisotropic stochastic gravitational-wave backgroundExperimental studies of gravityFOS: Physical sciencesO3O2General Relativity and Quantum Cosmology (gr-qc)Astronomy & AstrophysicsStochastic Background Gravitational Waves LIGO Virgo O1 O2 O3O1Gravitational wavesGeneral Relativity and Quantum CosmologyUPPER LIMITSstatistical analysis0103 physical sciencesadvanced LIGO and Virgoddc:530KAGRAKAGRACosmology & Astrophysics010306 general physicsSTFCgravitational waves; LIGO; VirgoGravitational WavesScience & Technology010308 nuclear & particles physicsGravitational waveVirgogravitational radiation: backgroundRCUKGalaxyLIGOVIRGOgravitational radiation: emissionspectrum: densityRADIATIONCROSS-CORRELATION SEARCHStochastic BackgroundDewey Decimal Classification::500 | Naturwissenschaften::530 | PhysikgalaxyExperimental studies of gravity; General relativity; Gravitational waves
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Constraints on cosmological models from strong gravitational lensing systems

2012

Strong lensing has developed into an important astrophysical tool for probing both cosmology and galaxies (their structure, formation, and evolution). Using the gravitational lensing theory and cluster mass distribution model, we try to collect a relatively complete observational data concerning the Hubble constant independent ratio between two angular diameter distances $D_{ds}/D_s$ from various large systematic gravitational lens surveys and lensing by galaxy clusters combined with X-ray observations, and check the possibility to use it in the future as complementary to other cosmological probes. On one hand, strongly gravitationally lensed quasar-galaxy systems create such a new opportun…

PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)Strong gravitational lensingFOS: Physical sciencesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsCosmologyRedshiftEinstein radiussymbols.namesakeGravitational lenssymbolsDark energyGalaxy clusterAstrophysics - Cosmology and Nongalactic AstrophysicsHubble's lawJournal of Cosmology and Astroparticle Physics
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Investigation of the orientation of galaxies in clusters: the importance, methods and results of research

2018

Various models of structure formation can account for various aspects of the galaxy formation process on different scales, as well as for various observational features of structures. Thus, the investigation of galaxies orientation constitute a standard test of galaxies formation scenarios since observed variations in angular momentum represent fundamental constraints for any model of galaxy formation. We have improved the method of analysis of the alignment of galaxies in clusters. Now, the method allowed analysis both position angles of galaxy major axes and two angles describing the spatial orientation of galaxies. The distributions of analyzed angles were tested for isotropy by applying…

PhysicsAngular momentumStructure formation010308 nuclear & particles physicsIsotropyFOS: Physical sciencesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsgalaxy formationAstrophysics - Astrophysics of Galaxies01 natural sciencesGalaxyAstrophysics of Galaxies (astro-ph.GA)Orientation (geometry)0103 physical sciencesgalaxy clustersGalaxy formation and evolutionAstrophysics::Galaxy AstrophysicsGalaxy clusterStatistical hypothesis testingJournal of Cosmology and Astroparticle Physics
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