Article
Astronomy & Astrophysics
T. Schrabback, S. Bocquet, M. Sommer, H. Zohren, J. L. van den Busch, B. Hernandez-Martin, H. Hoekstra, S. F. Raihan, M. Schirmer, D. Applegate, M. Bayliss, B. A. Benson, L. E. Bleem, J. P. Dietrich, B. Floyd, S. Hilbert, J. Hlavacek-Larrondo, M. McDonald, A. Saro, A. A. Stark, N. Weissgerber
Summary: Expanding on previous work, the study presents weak-lensing measurements for 30 distant massive galaxy clusters, revealing a relationship between mass scale and redshift evolution, with a discrepancy from the flat Planck cosmology model. Further expanded observations are needed to test the level of agreement between SPT clusters and Planck.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. L. van den Busch, A. H. Wright, H. Hildebrandt, M. Bilicki, M. Asgari, S. Joudaki, C. Blake, C. Heymans, A. Kannawadi, H. Y. Shan, T. Troster
Summary: In this study, a cosmic shear analysis with an improved redshift calibration for the fourth data release of the Kilo-Degree Survey (KiDS-1000) was presented using self-organising maps (SOMs). The redshift calibration sample was expanded to include data from 17 spectroscopic redshift campaigns and was enhanced with precision photometric redshifts from COSMOS2015 and the Physics of the Accelerated Universe Survey (PAUS). A Complete Orthogonal Sets of E/B-Integrals (COSEBIs) cosmic shear analysis was performed on the newly calibrated KiDS sample. The results showed good agreement with previous studies and increased the tension with measurements of the cosmic microwave background.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
T. N. Varga, D. Gruen, S. Seitz, N. MacCrann, E. Sheldon, W. G. Hartley, A. Amon, A. Choi, A. Palmese, Y. Zhang, M. R. Becker, J. McCullough, E. Rozo, E. S. Rykoff, C. To, S. Grandis, G. M. Bernstein, S. Dodelson, K. Eckert, S. Everett, R. A. Gruendl, I. Harrison, K. Herner, R. P. Rollins, I. Sevilla-Noarbe, M. A. Troxel, B. Yanny, J. Zuntz, H. T. Diehl, M. Jarvis, M. Aguena, S. Allam, J. Annis, E. Bertin, S. Bhargava, D. Brooks, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, J. P. Dietrich, I. Ferrero, B. Flaugher, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, J. Gschwend, G. Gutierrez, S. R. Hinton, K. Honscheid, T. Jeltema, K. Kuehn, N. Kuropatkin, M. A. G. Maia, M. March, P. Melchior, F. Menanteau, R. Miquel, R. Morgan, J. Myles, F. Paz-Chinchon, A. A. Plazas, A. K. Romer, E. Sanchez, V. Scarpine, M. Schubnell, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, J. Weller
Summary: We have developed a novel data-driven method for generating synthetic optical observations of galaxy clusters. By measuring and modeling the photometric properties of galaxy clusters and extrapolating the galaxy populations, we can create synthetic galaxy clusters in the same format as actual survey observations. This method can be used to test systematic uncertainties in cluster mass measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Calum Murray, James G. Bartlett, Emmanuel Artis, Jean-Baptiste Melin
Summary: In this study, weak lensing mass estimates were presented for 458 galaxy clusters using weak lensing data. The mass-richness relation and the correlation between cluster richness and weak lensing masses were explored. The results showed some discrepancies compared to other studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Henk Hoekstra
Summary: The study presents a fully data-driven approach using METADETECTION to accurately estimate shear in weak lensing by large-scale structure with anisotropic point spread function observations. By exploiting the insensitivity of multiplicative shear bias obtained with METADETECTION to PSF ellipticity, unbiased shear estimates can be obtained from observed data alone. The data-driven approach meets the stringent requirements for upcoming space- and ground-based surveys, with potential for further optimization.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Niemiec, M. Jauzac, D. Eckert, D. Lagattuta, K. Sharon, A. M. Koekemoer, K. Umetsu, A. Acebron, J. M. Diego, D. Harvey, E. Jullo, V Kokorev, M. Limousin, G. Mahler, P. Natarajan, M. Nonino, C. Steinhardt, S- Tam, A. Zitrin
Summary: The study presents a combined strong and weak lensing analysis of the Abell 370 cluster using the HST BUFFALO program. Seven candidate substructures were identified and evaluated for their physical significance. Five of these candidates were found to be reliable, and the mass distribution in Abell 370 was observed to extend along the north-west and south-east directions. This research provides new insights into the complex mass distribution of clusters at large cluster-centric radii.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Bilicki, A. Dvornik, H. Hoekstra, A. H. Wright, N. E. Chisari, M. Vakili, M. Asgari, B. Giblin, C. Heymans, H. Hildebrandt, B. W. Holwerda, A. Hopkins, H. Johnston, A. Kannawadi, K. Kuijken, S. J. Nakoneczny, H. Y. Shan, A. Sonnenfeld, E. Valentijn
Summary: The study presents a bright galaxy sample selected using accurate photometric redshifts from the Kilo-Degree Survey Data Release 4, with precise photo-zs determined through a supervised machine learning neural network algorithm. The data shows low mean errors and scatter, allowing for estimation of robust absolute magnitudes and stellar masses. Analysis of the data reveals that red galaxies at high stellar mass occupy dark matter halos that are significantly more massive than those occupied by blue galaxies at the same stellar mass.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Imran S. Hasan, Samuel J. Schmidt, Michael D. Schneider, J. Anthony Tyson
Summary: This study investigates the systematic errors in cosmology inference caused by systematic errors in the galaxy redshift distribution. Observational data from the Deep Lens Survey is used to characterize the degenerate effects on tomographic bin widths and galaxy bias. The study finds that by correcting the errors in the redshift distribution, the derived cosmological parameter shows a decreased bias.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Myles, A. Alarcon, A. Amon, C. Sanchez, S. Everett, J. DeRose, J. McCullough, D. Gruen, G. M. Bernstein, M. A. Troxel, S. Dodelson, A. Campos, N. MacCrann, B. Yin, M. Raveri, A. Amara, M. R. Becker, A. Choi, J. Cordero, K. Eckert, M. Gatti, G. Giannini, J. Gschwend, R. A. Gruendl, I Harrison, W. G. Hartley, E. M. Huff, N. Kuropatkin, H. Lin, D. Masters, R. Miquel, J. Prat, A. Roodman, E. S. Rykoff, I Sevilla-Noarbe, E. Sheldon, R. H. Wechsler, B. Yanny, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, S. Bhargava, S. L. Bridle, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, C. Conselice, M. Costanzi, M. Crocce, L. N. da Costa, M. E. S. Pereira, S. Desai, H. T. Diehl, T. F. Eifler, J. Elvin-Poole, A. E. Evrard, I Ferrero, A. Ferte, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, T. Giannantonio, S. R. Hinton, D. L. Hollowood, K. Honscheid, B. Hoyle, D. Huterer, D. J. James, E. Krause, K. Kuehn, O. Lahav, M. Lima, M. A. G. Maia, J. L. Marshall, P. Martini, P. Melchior, F. Menanteau, J. J. Mohr, R. Morgan, J. Muir, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, A. A. Plazas, M. Rodriguez-Monroy, S. Samuroff, E. Sanchez, V Scarpine, L. F. Secco, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller, W. Wester
Summary: Determining the redshifts of galaxies observed by wide-field photometric experiments is crucial for mapping the matter density with gravitational lensing. This study validates the assumptions made for assigning weak lensing source galaxies from the Dark Energy Survey and combines information from multiple likelihood functions to estimate the redshift distributions with calibrated uncertainties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Maria Cristina Fortuna, Henk Hoekstra, Benjamin Joachimi, Harry Johnston, Nora Elisa Chisari, Christos Georgiou, Constance Mahony
Summary: This study investigates the impact of different galaxy samples on cosmic shear studies using the halo model formalism, accounting for varied IA features and redshift dependencies. The model includes luminosity and signal radial dependencies, and uses realistic mocks to validate predictions. Results indicate that uncertainties in predicting IA signal largely stem from fainter galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
C. Zhou, A. Tong, M. A. Troxel, J. Blazek, C. Lin, D. Bacon, L. Bleem, C. Chang, M. Costanzi, J. Derose, J. P. Dietrich, A. Drlica-Wagner, D. Gruen, R. A. Gruendl, B. Hoyle, M. Jarvis, N. Maccrann, B. Mawdsley, T. Mcclintock, P. Melchior, J. Prat, A. Pujol, E. Rozo, E. S. Rykoff, S. Samuroff, E. Sheldon, T. Shin, A. Carnero Rosell, B. Yanny, C. Sanchez, D. L. Tucker, I Sevilla-Noarbe, J. Zuntz, T. N. Varga, Y. Zhang, O. Alves, A. Amon, E. Bertin, D. Brooks, D. L. Burke, M. Carrasco Kind, L. N. da Costa, T. M. Davis, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, S. Everett, I Ferrero, B. Flaugher, J. Frieman, D. W. Gerdes, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, T. Jeltema, K. Kuehn, O. Lahav, M. Lima, J. L. Marshall, J. Mena-Fernandez, F. Menanteau, R. Miquel, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, A. Porredon, M. Raveri, A. K. Romer, E. Sanchez, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, N. Weaverdyck, J. Weller, P. Wiseman
Summary: This study focuses on the intrinsic alignment of galaxies within clusters using the Dark Energy Survey (DES) Year 1 data. The researchers found evidence of a non-zero radial alignment of galaxies within clusters between redshifts 0.1-0.7. They also discovered systematic effects in the measured ellipticities of cluster satellite galaxies and attempted to correct for this signal. Additionally, stronger alignments were observed between the central galaxy and the cluster dark matter halo at low redshift, higher richness, and central galaxy absolute magnitude.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Chenxiao Zeng, Andres N. Salcedo, Hao-Yi Wu, Christopher M. Hirata
Summary: In this study, we investigate the use of three correlation functions - cluster lensing, the cluster-galaxy cross-correlation function, and the galaxy autocorrelation function - to self-calibrate optical cluster selection bias in a richness-selected sample. We develop mock catalogues of redMaGiC-like galaxies and redMaPPer-like clusters using N-body simulations and counts-in-cylinders around massive haloes as a richness proxy. We find that projection effects significantly boost both the projected and three-dimensional correlation functions. Likelihood analysis shows that the selection bias can be constrained at the 10 per cent level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Bailey Robison, Michael J. Hudson, Jean-Charles Cuillandre, Thomas Erben, Sebastien Fabbro, Raphael Gavazzi, Axel Guinot, Stephen Gwyn, Hendrik Hildebrandt, Martin Kilbinger, Alan McConnachie, Lance Miller, Isaac Spitzer, Ludovic van Waerbeke
Summary: Using weak gravitational lensing, the ellipticity of dark matter haloes around Luminous Red Galaxies (LRGs) was measured. The results showed that for LRGs in the Sloan Digital Sky Survey Data Release 7 (DR7) with mass M~ 2.7 x 10^13 M_sun h^-1, the halo ellipticity was found to be e = 0.46 +/- 0.10, with f(h) = 2.2 +/- 0.6 as a fraction of the galaxy's ellipticity. For BOSS LRGs, the detection was marginally significant: e = 0.20 +/- 0.10 and f(h) = 0.7 +/- 0.7. These findings are consistent with previous measurements and suggest an increase in halo ellipticity of 0.10 +/- 0.06 per decade in halo mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Hao-Yi Wu, Matteo Costanzi, Chun-Hao To, Andres N. Salcedo, David H. Weinberg, James Annis, Sebastian Bocquet, Maria Elidaiana da Silva Pereira, Joseph DeRose, Johnny Esteves, Arya Farahi, Sebastian Grandis, Eduardo Rozo, Eli S. Rykoff, Tamas N. Varga, Risa H. Wechsler, Chenxiao Zeng, Yuanyuan Zhang, Zhuowen Zhang
Summary: This study investigates the selection bias of the stacked cluster lensing signal associated with optically selected clusters and finds a positive correlation between redMaPPer richness and weak lensing signal at a given cluster halo mass. The results show that the stacked lensing signal is biased high due to the cluster lensing selection bias, leading to overestimated mean cluster mass and biased cosmology results.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
K. Kiiveri, D. Gruen, A. Finoguenov, T. Erben, L. van Waerbeke, E. Rykoff, L. Miller, S. Hagstotz, R. Dupke, J. Patrick Henry, J-P Kneib, G. Gozaliasl, C. C. Kirkpatrick, N. Cibirka, N. Clerc, M. Costanzi, E. S. Cypriano, E. Rozo, H. Shan, P. Spinelli, J. Valiviita, J. Weller
Summary: The CODEX sample includes a large number of high-redshift galaxy cluster data and measures their mass using lensing constraints, ultimately resulting in statistical findings about the richness-mass relation of galaxy clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Federica B. Bianco, Zeljko Ivezic, R. Lynne Jones, Melissa L. Graham, Phil Marshall, Abhijit Saha, Michael A. Strauss, Peter Yoachim, Tiago Ribeiro, Timo Anguita, A. E. Bauer, Franz E. Bauer, Eric C. Bellm, Robert D. Blum, William N. Brandt, Sarah Brough, Marcio Catelan, William Clarkson, Andrew J. Connolly, Eric Gawiser, John E. Gizis, Renee Hlozek, Sugata Kaviraj, Charles T. Liu, Michelle Lochner, Ashish A. Mahabal, Rachel Mandelbaum, Peregrine McGehee, Eric H. Jr Jr Neilsen, Knut A. G. Olsen, Hiranya Peiris, Jason Rhodes, Gordon T. Richards, Stephen Ridgway, Megan E. Schwamb, Dan Scolnic, Ohad Shemmer, Colin T. Slater, Anze Slosar, Stephen J. Smartt, Jay Strader, Rachel Street, David E. Trilling, Aprajita Verma, A. K. Vivas, Risa H. Wechsler, Beth Willman
Summary: The Vera C. Rubin Observatory is a ground-based astronomical facility designed to conduct a 10-year optical survey of the Southern Hemisphere sky. It aims to probe dark energy and dark matter, catalog the solar system, explore the transient optical sky, and map the Milky Way. The massive data throughput of the survey will have transformative effects on other areas of astrophysics.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Yesukhei Jagvaral, Duncan Campbell, Rachel Mandelbaum, Markus Michael Rau
Summary: Using cosmological simulations, we developed two models to study the formation and evolution of galaxies by understanding different galaxy components. These models show improved robustness compared to traditional methods and better agreement with observational data. Additionally, we found different color groups and mass distributions within galaxy classifications.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tianqing Zhang, Rachel Mandelbaum
Summary: Weak gravitational lensing is a powerful tool for cosmology, but quantifying subtle systematic biases is a challenge. This study investigates the impact of errors in higher moments of the point spread function (PSF) model on weak lensing analysis for the LSST survey.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. M. Rau, C. B. Morrison, S. J. Schmidt, S. Wilson, R. Mandelbaum, Y-Y. Mao
Summary: Obtaining accurate redshift distributions of calibrated photometric samples is challenging, and this study presents an inference methodology that combines redshift information from galaxy photometry with constraints from two-point functions to address this issue. Results from simulations show that the proposed method can provide accurate calibration of sample redshift distributions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Correction
Astronomy & Astrophysics
Takashi Hamana, Masato Shirasaki, Satoshi Miyazaki, Chiaki Hikage, Masamune Oguri, Surhud More, Robert Armstrong, Alexie Leauthaud, Rachel Mandelbaum, Hironao Miyatake, Atsushi J. Nishizawa, Melanie Simet, Masahiro Takada, Hiroaki Aihara, James Bosch, Yutaka Komiyama, Robert Lupton, Hitoshi Murayama, Michael A. Strauss, Masayuki Tanaka
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2022)
Article
Astronomy & Astrophysics
Michelle Lochner, Dan Scolnic, Husni Almoubayyed, Timo Anguita, Humna Awan, Eric Gawiser, Satya Gontcho Gontcho, Melissa L. Graham, Philippe Gris, Simon Huber, Saurabh W. Jha, R. Lynne Jones, Alex G. Kim, Rachel Mandelbaum, Phil Marshall, Tanja Petrushevska, Nicolas Regnault, Christian N. Setzer, Sherry H. Suyu, Peter Yoachim, Rahul Biswas, Tristan Blaineau, Isobel Hook, Marc Moniez, Eric Neilsen, Hiranya Peiris, Daniel Rothchild, Christopher Stubbs
Summary: Researchers use metrics to assess the impact of observing strategy on cosmological probes, and find that multiple observing strategy decisions can profoundly impact cosmological constraints with LSST, including adjusting the survey footprint, taking repeat nightly visits in different filters, and maintaining a regular cadence.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Yesukhei Jagvaral, Sukhdeep Singh, Rachel Mandelbaum
Summary: A study found that the bulge components of galaxies exhibit similar intrinsic alignments as elliptical galaxies, highlighting the importance of studying galaxy dynamics to understand galaxy alignments and their cosmological implications.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Chien-Hao Lin, Rachel Mandelbaum, M. A. Troxel, Christopher M. Hirata, Mike Jarvis
Summary: The High-Latitude Survey of the Nancy Grace Roman Space Telescope will provide high-quality weak lensing data with minimal impact from the persistence effect. The effect of persistence on the weak lensing correlation function is expected to be minimal compared to other sources of error in the Roman Space Telescope's measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Xiangchong Li, Hironao Miyatake, Wentao Luo, Surhud More, Masamune Oguri, Takashi Hamana, Rachel Mandelbaum, Masato Shirasaki, Masahiro Takada, Robert Armstrong, Arun Kannawadi, Satoshi Takita, Satoshi Miyazaki, Atsushi J. Nishizawa, Andres A. Plazas Malagon, Michael A. Strauss, Masayuki Tanaka, Naoki Yoshida
Summary: We present a galaxy shear catalog for three-year cosmological weak gravitational lensing analyses. The catalog is based on data from the Wide layer of the HSC Subaru SSP Survey and covers an area of 433.48 deg(2) of the northern sky. The galaxy shapes are measured from i-band imaging data and calibrated with image simulations. The catalog meets the requirements for cosmological weak-lensing science, but there are residual biases related to PSF model shape and star-galaxy shape correlations that need mitigation.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2022)
Article
Astronomy & Astrophysics
Yesukhei Jagvaral, Francois Lanusse, Sukhdeep Singh, Rachel Mandelbaum, Siamak Ravanbakhsh, Duncan Campbell
Summary: In order to prepare for upcoming cosmological surveys, large simulations with realistic galaxy populations are needed. This study focuses on the effect of intrinsic alignments (IA), the tendency of galaxies to align towards overdensities. As simulating the details of galaxy formation and evolution relevant to IA is not feasible, a Deep Generative Model is proposed as an alternative. The model is trained on a simulation and is capable of sampling the orientations of galaxies to recover correct alignments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Tianqing Zhang, Markus Michael Rau, Rachel Mandelbaum, Xiangchong Li, Ben Moews
Summary: Recovering credible cosmological parameter constraints in weak lensing shear analysis requires accurate models and appropriate methods for marginalizing over nuisance parameters. This study proposes a statistically principled Bayesian resampling approach for marginalizing over uncertainties in the sample redshift distribution. Comparison with existing methods shows consistent error bars for predicted analyses, but the choice of method could modify parameter constraints by about 4% for data sets with stronger constraints, indicating the need for careful model selection.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Masaya Yamamoto, M. A. Troxel, Mike Jarvis, Rachel Mandelbaum, Christopher Hirata, Heyang Long, Ami Choi, Tianqing Zhang
Summary: We investigated the performance of the metacalibration shear calibration framework using simulated imaging data for the Roman reference HLIS. The results show that metacalibration can calibrate shapes within certain precision. However, the precision is limited by the simulated survey volume, and further work on testing the shear calibration methodology is necessary, especially in the presence of blending. Nevertheless, the current results demonstrate that metacalibration can work on undersampled space-based Roman imaging data at levels comparable to requirements of current weak lensing surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tianqing Zhang, Husni Almoubayyed, Rachel Mandelbaum, Joshua E. Meyers, Mike Jarvis, Arun Kannawadi, Morgan A. Schmitz, Axel Guinot, LSST Dark Energy Sci Collaboration
Summary: Weak lensing is a powerful tool for studying dark matter and dark energy, but controlling systematic uncertainties becomes more challenging as statistical errors decrease. Errors in the higher moments of the point spread function (PSF) can introduce significant biases in weak lensing measurements. This study investigates the modeling quality of PSF moments from the 3rd to 6th order and propagates the PSFEx higher moments modeling error to weak lensing shear-shear correlation functions and cosmological analyses. The results show that errors in PSF higher moments can cause shifts in cosmological parameters and should be reduced or explicitly modeled in weak lensing analysis.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Emily P. Longley, Chihway Chang, Christopher W. Walter, Joe Zuntz, Mustapha Ishak, Rachel Mandelbaum, Hironao Miyatake, Andrina Nicola, Eske M. Pedersen, Maria E. S. Pereira, Judit Prat, J. Sanchez, Lucas F. Secco, Tilman Troester, Michael Troxel, Angus H. Wright
Summary: Cosmological parameter constraints from recent galaxy imaging surveys have reached percent-level accuracy on the effective amplitude of the lensing signal, S-8. The upcoming LSST will provide subpercent level measurements of cosmological parameters, which will be a milestone test for the ?CDM model. A unified catalogue-level reanalysis of three cosmic shear data sets from DES-Y1, KiDS-1000, and HSC-Y1 shows that the S-8 constraint is robust and the three surveys are statistically consistent. Considering the cross-covariance between KiDS-1000 and HSC-Y1, the combined data sets yield a 1.6-1.9% constraint on S-8 under different assumptions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. A. Troxel, C. Lin, A. Park, C. Hirata, R. Mandelbaum, M. Jarvis, A. Choi, J. Givans, M. Higgins, B. Sanchez, M. Yamamoto, H. Awan, J. Chiang, O. Dore, C. W. Walter, T. Zhang, J. Cohen-Tanugi, E. Gawiser, A. Hearin, K. Heitmann, M. Ishak, E. Kovacs, Y-y Mao, M. Wood-Vasey, LSST Dark Energy Sci Collaborat
Summary: This article presents and validates synthetic imaging surveys of Nancy Grace Roman Space Telescope High-Latitude Imaging Survey (HLIS) and Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). The simulations explore the identification of unrecognized blends in LSST and Roman images, revealing that 20-30% of objects in LSST images can be identified as multiple objects in Roman images.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
