國立虎尾科技大學 |

Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory./
Author:	Hebert, Claire-Alice.
Description:	1 online resource (188 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
Subject:	Theoretical physics. -
Online resource:	click for full text (PQDT)
ISBN:	9798381028157

Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory.
Hebert, Claire-Alice.

Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory. - 1 online resource (188 pages)

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--Stanford University, 2023.

Includes bibliographical references

The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will image tens of billions of galaxies over ten years-a 100 times increase over previous surveys-enabling the most precise measurements of dark energy properties to date. Realizing the full potential of this powerful dataset requires an unprecedented understanding of observational effects that, if uncorrected, can bias the science results. One such source is the blurring of images due to optical turbulence in the atmosphere, which dominates the point-spread function (PSF) for ground-based instruments. This atmospheric effect imprints spatially correlated noise on scales (and with amplitudes) similar to the cosmological signal we will study: the spatial correlation of positions and shapes of galaxies on the plane of the sky due to gravitational lensing of light by the dark matter in the Universe. High-fidelity simulated astronomical images are an important tool in developing and measuring the performance of image-processing algorithms that will be needed to accurately and precisely account for sources of correlated noise such as the atmospheric PSF.This thesis presents a new simulation tool, psf-weather-station, that allows us to study and model the dependence of correlations in the atmospheric PSF on weather conditions at any observatory by leveraging data from weather forecasting models. We use this tool to simulate and study the correlations in the size and shape of the atmospheric PSF predicted for the Vera C. Rubin Observatory in Chile. We make quantitative predictions for two-point correlation functions (2PCF) that are used in analyses of cosmic shear. We observe a strong anisotropy in the two-dimensional 2PCF, which is expected based on observations in real images, and study the dependence of the orientation of the anisotropy on dominant wind directions at the observatory site.We also explore the temporal behaviour of the atmospheric PSF using high-resolution speckle images of stars, recorded near Rubin Observatory, and simulate similar observations using psfweather-station. We find differences in the time scales of correlation in the PSF between data and simulations, but observe a consistent dependence of PSF shape with image motion on short time scales.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381028157Subjects--Topical Terms:

1180318
Theoretical physics.
Index Terms--Genre/Form:

554714
Electronic books.

Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory.
LDR:03679ntm a22003977 4500 001 1148755
005 20240930100138.5
006 m o d
007 cr bn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798381028157
035 $a (MiAaPQ)AAI30742174
035 $a (MiAaPQ)STANFORDvc035yz3635
035 $a AAI30742174
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Hebert, Claire-Alice. $3 1474799
245 1 0 $a Cosmic Shear, Or Atmosphere? Modeling the Atmosphere for Dark Energy Measurements with the Vera C. Rubin Observatory.
264 0 $c 2023
300 $a 1 online resource (188 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
500 $a Advisor: Moerner, William;Roodman, Aaron;Burchat, Patricia.
502 $a Thesis (Ph.D.)--Stanford University, 2023.
504 $a Includes bibliographical references
520 $a The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will image tens of billions of galaxies over ten years-a 100 times increase over previous surveys-enabling the most precise measurements of dark energy properties to date. Realizing the full potential of this powerful dataset requires an unprecedented understanding of observational effects that, if uncorrected, can bias the science results. One such source is the blurring of images due to optical turbulence in the atmosphere, which dominates the point-spread function (PSF) for ground-based instruments. This atmospheric effect imprints spatially correlated noise on scales (and with amplitudes) similar to the cosmological signal we will study: the spatial correlation of positions and shapes of galaxies on the plane of the sky due to gravitational lensing of light by the dark matter in the Universe. High-fidelity simulated astronomical images are an important tool in developing and measuring the performance of image-processing algorithms that will be needed to accurately and precisely account for sources of correlated noise such as the atmospheric PSF.This thesis presents a new simulation tool, psf-weather-station, that allows us to study and model the dependence of correlations in the atmospheric PSF on weather conditions at any observatory by leveraging data from weather forecasting models. We use this tool to simulate and study the correlations in the size and shape of the atmospheric PSF predicted for the Vera C. Rubin Observatory in Chile. We make quantitative predictions for two-point correlation functions (2PCF) that are used in analyses of cosmic shear. We observe a strong anisotropy in the two-dimensional 2PCF, which is expected based on observations in real images, and study the dependence of the orientation of the anisotropy on dominant wind directions at the observatory site.We also explore the temporal behaviour of the atmospheric PSF using high-resolution speckle images of stars, recorded near Rubin Observatory, and simulate similar observations using psfweather-station. We find differences in the time scales of correlation in the PSF between data and simulations, but observe a consistent dependence of PSF shape with image motion on short time scales.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Theoretical physics. $3 1180318
650 4 $a Optics. $3 595336
650 4 $a Mathematics. $3 527692
650 4 $a Energy. $3 784773
650 4 $a Astrophysics. $3 646223
650 4 $a Astronomy. $3 593935
650 4 $a Cosmology. $3 579761
650 4 $a Universe. $3 787622
650 4 $a Dark energy. $3 1467482
650 4 $a General circulation models. $3 1474804
650 4 $a Radiation. $3 673044
650 4 $a Theory of relativity. $3 1474803
650 4 $a Stars & galaxies. $3 1474789
650 4 $a Dark matter. $3 1474802
650 4 $a Observatories. $3 1474801
650 4 $a Power. $3 999190
650 4 $a Atmosphere. $3 670485
650 4 $a Fourier transforms. $3 1372561
650 4 $a Space telescopes. $3 1249036
650 4 $a Physics. $3 564049
650 4 $a Adventure. $3 1474800
655 7 $a Electronic books. $2 local $3 554714
690 $a 0605
690 $a 0606
690 $a 0596
690 $a 0791
690 $a 0405
690 $a 0752
690 $a 0753
710 2 $a Stanford University. $3 1184533
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Dissertations Abstracts International $g 85-06B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30742174 $z click for full text (PQDT)