Article
Astronomy & Astrophysics
Marika Asgari, Indiarose Friswell, Mijin Yoon, Catherine Heymans, Andrej Dvornik, Benjamin Joachimi, Patrick Simon, Joe Zuntz
Summary: The study introduces a mitigation strategy to reduce the impact of non-linear galaxy bias on the joint cosmological analysis of weak lensing and galaxy surveys, utilizing Psi-statistic to minimize contributions from smallest physical scales and showing comparable constraining power to standard two-point galaxy clustering statistics. It demonstrates a significant decrease in bias on cosmological parameter S-8 when analyzing Psi-statistics compared to standard two-point correlation functions, highlighting the importance of moving towards new statistics less sensitive to smallest physical scales in 3 x 2pt analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jaime Ruiz-Zapatero, Boryana Hadzhiyska, David Alonso, Pedro G. Ferreira, Carlos Garcia-Garcia, Arrykrishna Mootoovaloo
Summary: As the statistical power of imaging surveys increases, it is crucial to consider all systematic uncertainties. Constructing a model and marginalizing over extra model parameters can account for these uncertainties. The high dimensionality of the total parameter spaces makes inferring cosmological parameters more time-consuming using traditional methods. However, a linearization of the theoretical prediction with respect to calibrated systematic parameters allows for analytical marginalization, reducing the time needed for parameter inference by a factor of approximately 30 while accurately recovering the same posterior distributions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xiangkun Liu, Shuo Yuan, Chuzhong Pan, Tianyu Zhang, Qiao Wang, Zuhui Fan
Summary: In this study, we analyze weak-lensing tomographic peak data from the HSC-SSP survey and use a theoretical peak model to derive cosmological constraints. We consider various systematic effects and uncertainties in our analysis, including the projection effect of large-scale structures, baryonic effects, galaxy intrinsic alignments, and residual uncertainties in shear and photometric redshift calibrations. The derived constraints improve upon previous non-tomographic peak analyses.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ziwei Li, Xiangkun Liu, Zuhui Fan
Summary: In this paper, a new method called peak steepness statistics is introduced to understand the cosmological information compared to commonly used peak height statistics. The analyses using ray-tracing simulations and a theoretical model show that the steepness statistics is more sensitive to cosmological parameters than the peak height statistics, but this advantage decreases with the increase of shape noise.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. MacCrann, M. R. Becker, J. McCullough, A. Amon, D. Gruen, M. Jarvis, A. Choi, M. A. Troxel, E. Sheldon, B. Yanny, K. Herner, S. Dodelson, J. Zuntz, K. Eckert, R. P. Rollins, T. N. Varga, G. M. Bernstein, R. A. Gruendl, I Harrison, W. G. Hartley, I Sevilla-Noarbe, A. Pieres, S. L. Bridle, J. Myles, A. Alarcon, S. Everett, C. Sanchez, E. M. Huff, F. Tarsitano, M. Gatti, L. F. Secco, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Costanzi, M. Crocce, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, T. F. Eifler, I Ferrero, A. Ferte, B. Flaugher, P. Fosalba, J. Frieman, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, T. Giannantonio, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, O. Lahav, M. Lima, M. A. G. Maia, M. March, J. L. Marshall, P. Martini, P. Melchior, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, J. Muir, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, A. A. Plazas, M. Rodriguez-Monroy, A. Roodman, S. Samuroff, E. Sanchez, V Scarpine, S. Serrano, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, R. D. Wilkinson
Summary: The study discusses the necessity of large, realistic simulations to calibrate observational systematics in galaxy weak lensing, especially in the presence of object blending. It describes the methodology of estimating the effective redshift distribution for lensing using image simulations, and evaluates the shear estimation pipeline performance on DES Year 3 data. Blending-related effects are identified as the dominant contributor to shear calibration biases. By generating simulations with varying input shear signals with redshift, biases in estimating effective redshift distribution are calibrated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Constance Mahony, Maria Cristina Fortuna, Benjamin Joachimi, Andreas Korn, Henk Hoekstra, Samuel J. Schmidt
Summary: Recent works have shown that weak lensing magnification must be included in large-scale structure analyses to avoid biasing the cosmological results. This study investigates the impact of including magnification on the precision of cosmological constraints in an LSST galaxy clustering analysis and finds that it has little effect on the precision of the constraints.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Dominik Zurcher, Janis Fluri, Raphael Sgier, Tomasz Kacprzak, Alexandre Refregier
Summary: The study compared the constraining power of three map-based non-Gaussian statistics with the angular power spectrum in the Omega(m)-sigma(8) plane, finding that non-Gaussian statistics provide tighter constraints. A combination of non-Gaussian statistics and the angular power spectrum increased the constraining power and reduced the error on S8.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Henk Hoekstra, Arun Kannawadi, Thomas D. Kitching
Summary: The impact of object detection on surveys like Euclid can lead to biases exceeding requirements for the next generation of cosmic shear surveys. Galaxy blending is an important source of detection bias in realistic scenarios. METADETECTION can address blending issues, meeting the requirements for Stage IV surveys.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Mohamed Yousry Elkhashab, Cristiano Porciani, Daniele Bertacca
Summary: The study focuses on the impact of radial redshift-space distortions on the monopole moment of the galaxy power spectrum, demonstrating excess power due to peculiar velocities and a damped oscillatory pattern caused by the kinematic dipole overdensity. It also discusses the weak-lensing magnification effect and potential implications for determining cosmological parameters and properties of the galaxy population.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Carlo Giocoli, Federico Marulli, Lauro Moscardini, Mauro Sereno, Alfonso Veropalumbo, Lorenzo Gigante, Matteo Maturi, Mario Radovich, Fabio Bellagamba, Mauro Roncarelli, Sandro Bardelli, Sofia Contarini, Giovanni Covone, Joachim Harnois-Deraps, Lorenzo Ingoglia, Giorgio F. Lesci, Lorenza Nanni, Emanuella Puddu
Summary: This study uses a large photometric galaxy cluster sample and shear signal to assess cluster masses and test the Lambda CDM model. The results provide strong observational evidence of the two-halo signal in the stacked gravitational lensing of galaxy clusters, further demonstrating the reliability of this probe for cosmological studies. The main result is a robust constraint on Omega(M), consistent with estimates from cosmic microwave background experiments.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Zhuoqi (Jackie) Zhang, Chihway Chang, Patricia Larsen, Lucas F. Secco, Joe Zuntz
Summary: We explore the cosmological constraints by studying two cross-correlation probes between galaxy and cosmic microwave background (CMB) surveys: the cross-correlation of lens galaxy density with CMB lensing convergence.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ting Tan, Dominik Zurcher, Janis Fluri, Alexandre Refregier, Federica Tarsitano, Tomasz Kacprzak
Summary: Weak gravitational lensing is a powerful tool for constraining the standard cosmological model and its extensions. Accurate predictions for weak lensing statistics are necessary to limit the impact of theoretical uncertainties on cosmological parameter constraints. This study compares theoretical predictions for the non-linear matter and weak lensing power spectra using fitting functions, emulators, and N-body simulations. It finds that the fitting functions, especially mead, provide the best agreement with the emulators.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Patrick Simon, Stefan Hilbert
Summary: By testing two semi-analytic models with data from the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), a study found that galaxy bias increases with scale and stellar mass, and shows color dependency. Despite reasonable agreement on relative changes with scale and galaxy properties, there is a clear conflict for the galaxy bias factor b(k) without model preference.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Benjamin Giblin, Catherine Heymans, Marika Asgari, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Arun Kannawadi, Konrad Kuijken, Chieh-An Lin, Lance Miller, Tilman Troster, Jan Luca van den Busch, Angus H. Wright, Maciej Bilicki, Chris Blake, Jelte de Jong, Andrej Dvornik, Thomas Erben, Fedor Getman, Nicola R. Napolitano, Peter Schneider, HuanYuan Shan, Edwin Valentijn
Summary: This study presents weak lensing shear catalogues from the KiDS-1000 survey, evaluating the accuracy of the PSF model and validating the shear estimates. No significant non-lensing B-mode distortions were found in the data, with low amplitude of PSF residuals detected in the highest-redshift bins. The joint KiDS-1000 shear and photometric redshift calibration is deemed sufficiently robust for combined-probe gravitational lensing and spectroscopic clustering analyses.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Alessandro Maraio, Alex Hall, Andy Taylor
Summary: In this study, we compare the performance of a new optimal likelihood estimator (QML) and a general estimator in terms of residual and estimation errors through simulated experiments of weak lensing measurements. We find that the QML method significantly reduces estimation errors compared to the general method and can better capture the information of B modes. This is important for future weak lensing measurements as it provides a better data analysis tool.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)