New near-infrared observations and lens-model constraints for UM673

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101106

Title:	New near-infrared observations and lens-model constraints for UM673
Authors:	陳文屏;Koptelova, E.;Chiueh, T.;Chen, W. P.;Chan, H. H.
Contributors:	理學院天文研究所
Keywords:	Astronomy;Estimates;Flux;Fluxes;gravitational lensing: strong;Lenses;methods: data analysis;Photometry;Position measurement;quasars: individual: UM673;Telescopes
Date:	2014-01-01
Issue Date:	2026-04-21 14:24:13 (UTC+8)
Publisher:	EDP Sciences
Abstract:	摘要： Aims. We performed a detailed photometric analysis of the lensed system UM673 (Q0142-100) and an analysis of the tentative lens models. Methods. High-resolution adaptive optics images of UM673 taken with the Subaru telescope in the H band were examined. We also analysed the J, H and K-band observational data of UM673 obtained with the 1.3 m telescope at the CTIO observatory. Results. We present photometry of quasar components A and B of UM673, the lens, and the nearby bright galaxy using H-band observational data obtained with the Subaru telescope. Based on the CTIO observations of UM673, we also present J- and H-band photometry and estimates of the J, H and K-band flux ratios between the two UM673 components in recent epochs. The near-infrared fluxes of the A and B components of UM673 and their published optical fluxes are analysed to measure extinction properties of the lensing galaxy. We estimate the extinction-corrected flux ratio between components A and B to be about 2.14 mag. We discuss lens models for the UM673 system constrained with the positions of the UM673 components, their flux ratio, and the previously measured time delay. 出版者： EDP Sciences 出版日期： 2014-06-01 出處： Astronomy & Astrophysics, 2014-06, Vol.566, p.A36--np 資源來源： EDP Sciences 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201322230
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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