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Decomposing the host galaxy from high-z QSOs using principal component analysis
He, Wei1,2; Wang, Yi-Ping1
2019-10-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume19Issue:10Pages:10
AbstractHigh resolution deep imaging from space and adaptive optics techniques with large ground -based facilities have enabled studies examining faint host galaxies of high redshift quasi -stellar objects ( QSOs). However, the related image processing techniques, especially for a precise point -spread function (PSF) reconstruction and characterization of the host galaxy light profiles, have yet to be optimized. We present here the scientific performance of a principal component analysis (PCA) based PSF subtraction of the central bright point source of high redshift QSO images, as well as further characterization of the host galaxy profile by directly fitting a S`ersic model to the residual image using the Markov Chain Monte Carlo (MCMC) algorithm. With a set of reference PSF star images which represent interleaving exposures between the QSO imaging, we can create an orthogonal basis of eigen -images and restore the PSF of QSO images by projecting the QSO images onto the basis. In this way, we can quantify the modes in which the PSF varies with time by a basis function that characterizes the temporal variations of the reference star as well as the QSO images. To verify the algorithm, we performed a simulation and applied this method to one of the high -z QSO targets from Mechtley et al. We demonstrate that the PCA -based PSF subtraction and further modeling of the galaxy's light profile using MCMC fitting would sufficiently remove the effects from central dominating point sources, and improve characterization ability for the host galaxies of high - z QSOs to the background noise level which is much better than previous two -component fitting procedures.
Keywordquasars: general galaxies: active galaxies: high-redshift methods: data analysis
Funding OrganizationJohn Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program)
DOI10.1088/1674-4527/19/10/139
WOS KeywordSUPERMASSIVE BLACK-HOLES ; POINT-SPREAD FUNCTION ; GEMS
Language英语
Funding ProjectJohn Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[10173025] ; National Natural Science Foundation of China[10673013] ; National Natural Science Foundation of China[10778709] ; National Natural Science Foundation of China[11073031] ; National Natural Science Foundation of China[11653005] ; National Basic Research Program of China (973 Program)[TG 2000077602]
Funding OrganizationJohn Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program) ; John Templeton Foundation ; John Templeton Foundation ; National Astronomical Observatories, Chinese Academy of Sciences ; National Astronomical Observatories, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Program) ; National Basic Research Program of China (973 Program)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000505165600002
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/53933
Collection中国科学院国家天文台
Corresponding AuthorHe, Wei
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
He, Wei,Wang, Yi-Ping. Decomposing the host galaxy from high-z QSOs using principal component analysis[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(10):10.
APA He, Wei,&Wang, Yi-Ping.(2019).Decomposing the host galaxy from high-z QSOs using principal component analysis.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(10),10.
MLA He, Wei,et al."Decomposing the host galaxy from high-z QSOs using principal component analysis".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.10(2019):10.
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