Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Ma, Zhaoming"'
General Requirements on Matter Power Spectrum Predictions for Cosmology with Weak Lensing Tomography
Forthcoming projects such as DES, LSST, WFIRST, and Euclid aim to measure weak lensing shear correlations with unprecedented precision, constraining the dark energy equation of state at the percent level. Reliance on photometrically-determined redshi
Externí odkaz:
http://arxiv.org/abs/1111.0052
Publikováno v:
Astrophys. J. 720:1351-1369 (2010)
A goal of forthcoming imaging surveys is to use weak gravitational lensing shear measurements to constrain dark energy. We quantify the importance of uncalibrated photometric redshift outliers to the dark energy goals of forthcoming imaging surveys i
Externí odkaz:
http://arxiv.org/abs/1002.3383
Accurate knowledge of the telescope's point spread function (PSF) is essential for the weak gravitational lensing measurements that hold great promise for cosmological constraints. For space telescopes, the PSF may vary with time due to thermal drift
Externí odkaz:
http://arxiv.org/abs/0809.2954
Autor:
Ma, Zhaoming, Bernstein, Gary
Publikováno v:
Astrophys.J.682:39-48,2008
Weak gravitational lensing surveys using photometric redshifts can have their cosmological constraints severely degraded by errors in the photo-z scale. We explore the cosmological degradation vs the size of the spectroscopic survey required to calib
Externí odkaz:
http://arxiv.org/abs/0712.1562
Autor:
Ma, Zhaoming
Publikováno v:
Astrophys.J.665:887-898,2007
We modify the public PM code developed by Anatoly Klypin and Jon Holtzman to simulate cosmology with arbitrary initial power spectrum and equation of state of dark energy. With this tool in hand, we perform the following studies on the matter power s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610213
Autor:
Ma, Zhaoming1,2 (AUTHOR), Gao, Xuzhu1 (AUTHOR), Raza, Faisal3 (AUTHOR), Zafar, Hajra3 (AUTHOR), Huang, Guanhong1 (AUTHOR), Yang, Yunyun1 (AUTHOR), Shi, Feng4 (AUTHOR), Wang, Deqiang4,5 (AUTHOR) deqiang_wang@aliyun.com, He, Xia2 (AUTHOR) deqiang_wang@aliyun.com
Publikováno v:
Pharmaceutics. Sep2022, Vol. 14 Issue 9, pN.PAG-N.PAG. 14p.
Publikováno v:
Astrophys.J.636:21-29,2005
We perform a systematic analysis of the effects of photometric redshift uncertainties on weak lensing tomography. We describe the photo-z distribution with a bias and Gaussian scatter that are allowed to vary arbitrarily between intervals of dz = 0.1
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506614
Autor:
Yip, Ching-Wa, Connolly, Andrew, Berk, Daniel Vanden, Ma, Zhaoming, Frieman, Joshua, SubbaRao, Mark, Szalay, Alex
We construct eigenspectra from the DR1 quasars in the SDSS using the Karhunen-Lo\`eve (KL) transform (or Principal Component Analysis, PCA) in different redshift and luminosity bins. We find that the quasar spectra can be classified, by the first two
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403560
Autor:
Johnston, David E., Richards, Gordon T., Frieman, Joshua A., Keeton, Charles R., Strauss, Michael A., Becker, Robert H., White, Richard L., Johnson, Eric T., Ma, Zhaoming, SubbaRao, Mark, Bahcall, Neta A., Bernardi, Mariangela, Brinkmann, Jon, Eisenstein, Daniel J., Fukugita, Masataka, Hall, Patrick B., Inada, Naohisa, Knapp, Gillian R., Pindor, Bartosz, Schlegel, David J., Scranton, Ryan, Sheldon, Erin S., Schneider, Donald P., Szalay, Alexander S., York, Donald G.
Publikováno v:
Astron.J.126:2281,2003
We report the discovery of a new gravitationally lensed quasar from the Sloan Digital Sky Survey, SDSS J090334.92+502819.2. This object was targeted for SDSS spectroscopy as a Luminous Red Galaxy (LRG), but manual examination of the spectrum showed t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307371
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