Zobrazeno 31 - 40
of 161
pro vyhledávání: '"Okura, Yuki"'
Publikováno v:
Publ. Astron. Soc. Japan 65, 104, 2013
We examined the anisotropic point spread function (PSF) of Suprime-Cam data utilizing dense star field data. We decomposed the PSF ellipticities into three components, the optical aberration, atmospheric turbulence, and chip-misalignment in an empiri
Externí odkaz:
http://arxiv.org/abs/1304.4992
Publikováno v:
In IFAC PapersOnLine 2019 52(16):298-303
Autor:
Okura, Yuki, Futamase, Toshifumi
This is the third paper on the improvements of systematic errors in our weak lensing analysis using an elliptical weight function, called E-HOLICs. In the previous papers we have succeeded in avoiding error which depends on ellipticity of background
Externí odkaz:
http://arxiv.org/abs/1208.3564
Autor:
Okura, Yuki, Futamase, Toshifumi
We have developed a new method(E-HOLICs) of estimating gravitational shear by adopting an elliptical weight function to measure background galaxy images in our previous paper. Following to the previous paper where isotropic Point Spread Function(PSF)
Externí odkaz:
http://arxiv.org/abs/1107.5863
Autor:
Okura, Yuki, Futamase, Toshifumi
We develop a new method to estimate gravitational shear by adopting an elliptical weight function to measure background galaxy images. In doing so, we introduce a new concept of "zero plane" which is an imaginal source plane where shapes of all sourc
Externí odkaz:
http://arxiv.org/abs/1010.0466
We obtain the projected mass distributions for two Subaru/Suprime-Cam fields in the southwest region (r\simlt 60') of the Coma cluster (z=0.0236) by weak lensing analysis and detect eight subclump candidates. We quantify the contribution of backgroun
Externí odkaz:
http://arxiv.org/abs/1001.2402
Autor:
Okura, Yuki, Futamase, Toshifumi
Publikováno v:
Astrophys.J.699:143-149,2009
We investigate the possibility to use higher order moments of gravitational lensed images in the weak lensing analysis. For this purpose we employ spin-2 component of HOLICs(Higher Order Lensing Characteristics) developed by us. We test the weak lens
Externí odkaz:
http://arxiv.org/abs/0805.4498
We have developed a method for measuring higher-order weak lensing distortions of faint background galaxies, namely the weak gravitational flexion, by fully extending the Kaiser, Squires & Broadhurst method to include higher-order lensing image chara
Externí odkaz:
http://arxiv.org/abs/0710.2262
Publikováno v:
Astrophys.J.660:995-1002,2007
We study a possibility to use the octopole moment of gravitationally lensed images as a direct measure of the third-order weak gravitational lensing effect, or the gravitational flexion. It turns out that there is a natural relation between flexion a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607288
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