Article
Astronomy & Astrophysics
Andrei Lazanu
Summary: Machine learning techniques accurately extract cosmological parameters Omega(m) and sigma(8) from N-body simulations, and also find these parameters from the non-linear matter power spectrum using random forest regressors and deep neural networks. The power spectrum provides competitive results in terms of accuracy compared to using simulations, and the scalar spectral index ns can also be estimated from the power spectrum with lower precision.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
M. Ruiz-Granda, P. Vielva
Summary: This paper performs a phenomenological parametrisation of the standard cosmological model using Planck 2018 data to explore the physical processes of the Cosmic Microwave Background (CMB) anisotropies. The analysis finds that including polarization and lensing data provides tighter constraints on the physical contributions and breaks degeneracies seen when only temperature data is considered. The results show that the Planck experiment can constrain all phenomenological amplitudes except the late Integrated Sachs-Wolfe effect.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Anton Baleato Lizancos, Martin White
Summary: A leading method to constrain physical theories from cosmological observations is to test their predictions for the angular clustering statistics of matter tracers. This article explores the impact of anisotropies in the redshift distribution on angular two-point statistics, identifying a mode-coupling effect that adds power to auto-correlations and removes it from certain cross-correlations. The study also discusses special cases like galaxy clustering and cosmic shear and releases a code to compute the biases.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Rebeca Martinez-Carrillo, Juan Carlos Hidalgo, Karim A. Malik, Alkistis Pourtsidou
Summary: The researchers compute the real space galaxy power spectrum, including the effects of General Relativity and primordial non-Gaussianity through parameters f(NL) and g(NL), and assess the detectability of these contributions in Stage-IV surveys. They also found that specific values of the bias parameter may erase the primordial and relativistic contributions to the configuration space power spectrum.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Guido D'Amico, Leonardo Senatore, Pierre Zhang
Summary: By applying the Effective Field Theory of Large-Scale Structure to analyze the wCDM cosmological model, competitive CMB-independent limits on parameter w were set using data from BOSS, Pantheon, and BBN. After incorporating the Planck CMB data, adjustments were made to the limits on parameter w.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Fabian Schmidt
Summary: A forward model for matter and biased tracers at arbitrary order in Lagrangian perturbation theory is introduced, including complete LPT displacement field and relevant bias operators. Validation tests show subpercent agreement with N-body simulations, demonstrating the effectiveness and accuracy of the model. This method has broad applications in cosmology research.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Mina Ghodsi Yengejeh, Saeed Fakhry, Javad T. Firouzjaee, Hojatollah Fathi
Summary: Interacting dark matter-dark energy (IDMDE) models are considered as a current challenge that could impact cosmic structures. The models propose that the mass of dark matter particles is determined by their interactions with a scalar field characterized by dark energy. In this study, the integrated Sachs-Wolfe (ISW) effect in IDMDE models is investigated. The theoretical framework for IDMDE models is introduced, and the stability conditions are discussed. Perturbation equations are calculated by specifying a functional form for the energy density transfer rate. The amplitudes of the matter power spectrum and the ISW auto-power spectrum are determined for IDMDE models and compared with those of the ACDM model. The results show similarities in the behavior of the ISW auto-power spectrum for different phantom dark energy equation of state values, while the amplitude for the IDMDE model is expected to be higher than that of the ACDM model in the case of quintessence dark energy equation of state. Additionally, the amplitude of the ISW-auto power spectrum in IDMDE models is found to be inversely proportional to the coupling parameter xi. The amplitude of the ISW-cross power spectrum in IDMDE models is also calculated, and it is higher than that of the ACDM model for all values of w, with an inverse relationship to the coupling parameter xi.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
Mario Ballardini, Fabio Finelli
Summary: This study investigates a specific localized oscillation in the cosmic microwave background (CMB) temperature spectrum, which can be used to explain the excess smoothing of acoustic peaks. The study shows that this oscillation is strongly damped in the observed nonlinear matter power spectrum at z = 0, but is still present at lower redshifts, making it a target for future high-redshift galaxy surveys. The findings highlight the importance of studying the origin and evolution of the universe.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Mina Y. Ghodsi, Aryan Behnamfard, Saeed Fakhry, Javad T. Firouzjaee
Summary: A novel 4-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity model has been proposed, which shows a higher ISW effect compared to the Lambda-CDM (Λ CDM) model. The study explores the evolution of the gravitational potential, linear growth factor, ISW-auto power spectrum, and ISW-cross power spectrum in the 4D EGB model, revealing that the amplitude of the ISW power spectrum is amplified, suggesting a relative advantage of the 4D EGB model over the Λ CDM one.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Benedict Bahr-Kalus, Daniele Bertacca, Licia Verde, Alan Heavens
Summary: In this study, the impact of the observer's motion on the clustering signal in galaxy distribution and the Kaiser rocket effect is examined both analytically and numerically. While the Kaiser rocket effect can significantly bias cosmological parameter inference in idealistic full-sky surveys dominated by cosmic variance, it is not a major concern for forthcoming surveys with realistic masks and selection functions, except for possible implications on primordial non-Gaussianity studies. This systematic effect is well understood and should be accounted for using various approaches.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alexandre Barreira
Summary: The scale-dependent bias effect is a promising way to study the primordial non-Gaussianity parameter f(NL), but our limited knowledge of the linear PNG galaxy bias parameter b(phi) currently prevents us from accurately constraining f(NL).
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Alexandre Barreira
Summary: We place constraints on compensated isocurvature perturbations (CIP) using the BOSS DR12 galaxy power spectrum and find that galaxy data is powerful in constraining CIP.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
James M. Sullivan, Uros Seljak, Sukhdeep Singh
Summary: The updated Halo Zeldovich Perturbation Theory (HZPT) model provides an analytic and accurate description of the two-point statistics of dark matter on nonlinear scales, with applications to halo and galaxy clustering as well as galaxy-matter cross-correlation.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Dan Pryer, Robert E. Smith, Robin Booth, Chris Blake, Alexander Eggemeier, Jon Loveday
Summary: The study derives expressions for the galaxy power spectrum convolved by survey window in real space, considering the geometric lightcone effect for full sky and deep redshift surveys. It investigates the impact of using the standard mean redshift approximation, showing both overall amplitude suppression and scale-dependent error compared to the 'true' spectrum. However, it also demonstrates that accurate approximation to the full model can be achieved by carefully choosing an 'effective fixed-time' within a certain range of scales.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marcel Schmittfull, Marko Simonovic, Mikhail M. Ivanov, Oliver H. E. Philcox, Matias Zaldarriaga
Summary: An analytical forward model based on perturbation theory was developed to predict the redshift-space galaxy overdensity, finding residual noise characteristics in simulated galaxy density. Furthermore, comparison of galaxy velocities revealed that about 10% of galaxies contribute to half of the rms velocity residual in the simulated galaxy sample.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
E. Merlin, M. Castellano, H. Bretonniere, M. Huertas-Company, U. Kuchner, D. Tuccillo, F. Buitrago, J. R. Peterson, C. J. Conselice, F. Caro, P. Dimauro, L. Nemani, A. Fontana, M. Kuemmel, B. Haussler, W. G. Hartley, A. Alvarez Ayllon, E. Bertin, P. Dubath, F. Ferrari, L. Ferreira, R. Gavazzi, D. Hernandez-Lang, G. Lucatelli, A. S. G. Robotham, M. Schefer, C. Tortora, N. Aghanim, A. Amara, L. Amendola, N. Auricchio, M. Baldi, R. Bender, C. Bodendorf, E. Branchini, M. Brescia, S. Camera, V. Capobianco, C. Carbone, J. Carretero, F. J. Castander, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, L. Conversi, Y. Copin, L. Corcione, F. Courbin, M. Cropper, A. Da Silva, H. Degaudenzi, J. Dinis, M. Douspis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, M. Frailis, E. Franceschi, P. Franzetti, S. Galeotta, B. Garilli, B. Gillis, C. Giocoli, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, A. Hornstrup, P. Hudelot, K. Jahnke, S. Kermiche, A. Kiessling, T. Kitching, R. Kohley, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, H. J. McCracken, E. Medinaceli, M. Melchior, M. Meneghetti, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, W. J. Percival, G. Polenta, M. Poncet, L. Popa, L. Pozzetti, F. Raison, R. Rebolo, A. Renzi, J. Rhodes, G. Riccio, E. Romelli, E. Rossetti, R. Saglia, D. Sapone, B. Sartoris, P. Schneider, A. Secroun, G. Seidel, C. Sirignano, G. Sirri, J. Skottfelt, J. -L. Starck, P. Tallada-Crespi, A. N. Taylor, I. Tereno, R. Toledo-Moreo, I. Tutusaus, L. Valenziano, T. Vassallo, Y. Wang, J. Weller, A. Zacchei, G. Zamorani, J. Zoubian, S. Andreon, S. Bardelli, A. Boucaud, C. Colodro-Conde, D. Di Ferdinando, J. Gracia-Carpio, V. Lindholm, N. Mauri, S. Mei, C. Neissner, V. Scottez, A. Tramacere, E. Zucca, C. Baccigalupi, A. Balaguera-Antolinez, M. Ballardini, F. Bernardeau, A. Biviano, S. Borgani, A. S. Borlaff, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, A. R. Cooray, J. Coupon, H. M. Courtois, O. Cucciati, S. Davini, G. De Lucia, G. Desprez, J. A. Escartin, S. Escoffier, M. Farina, K. Ganga, J. Garcia-Bellido, K. George, G. Gozaliasl, H. Hildebrandt, I. Hook, O. Ilbert, S. Ilic, B. Joachimi, V. Kansal, E. Keihanen, C. C. Kirkpatrick, A. Loureiro, J. Macias-Perez, M. Magliocchetti, G. Mainetti, R. Maoli, S. Marcin, M. Martinelli, N. Martinet, S. Matthew, M. Maturi, R. B. Metcalf, P. Monaco, G. Morgante, S. Nadathur, A. A. Nucita, L. Patrizii, V. Popa, C. Porciani, D. Potter, A. Pourtsidou, M. Pontinen, P. Reimberg, A. G. Sanchez, Z. Sakr, M. Schirmer, M. Sereno, J. Stadel, R. Teyssier, C. Valieri, J. Valiviita, S. E. van Mierlo, A. Veropalumbo, M. Viel, J. R. Weaver, D. Scott
Summary: The Euclid mission of the European Space Agency aims to provide high-quality imaging for 1.5 billion galaxies. A software pipeline is being developed to process and analyze the massive amount of data in real time, including a model-fitting algorithm for important photometric and morphological estimates. The Euclid Morphology Challenge compares five model-fitting software packages on simulated data to identify the best algorithm for implementation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Benedict Bahr-Kalus, David Parkinson, Richard Easther
Summary: The ability to test and constrain theories of cosmic inflation will greatly improve in the next decade. Key data sources include cosmic microwave background (CMB) measurements and observations of matter distribution at low-redshift. A positive detection of a CMB B-mode consistent with a primordial stochastic gravitational wave background (SGWB) is considered strong evidence for inflation, but a null result does not exclude it. This study forecasts the precision with which the spectral index n(s) and the running alpha(s) can be constrained by current and planned observations, providing informative constraints on the inflationary parameter space if the SGWB remains undetected.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
U. Malik, R. Sharp, A. Penton, Z. Yu, P. Martini, C. Lidman, B. E. Tucker, T. M. Davis, G. F. Lewis, M. Aguena, S. Allam, O. Alves, F. Andrade-Oliveira, J. Asorey, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, D. L. Burke, A. Carnero Rosell, D. Carollo, M. Carrasco Kind, J. Carretero, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, S. Everett, I Ferrero, J. Frieman, J. Garcia-Bellido, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, J. L. Marshall, J. Mena-Fernandez, F. Menanteau, R. Miquel, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, M. Raveri, M. Rodriguez-Monroy, A. K. Romer, E. Sanchez, V Scarpine, I Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, G. Taylor, D. L. Tucker, N. Weaverdyck, R. D. Wilkinson
Summary: Reverberation mapping measures the relationship between the size of the broad-line region and luminosity of AGN. This study presents reverberation measurements using H beta from the OzDES program, successfully recovering reverberation lags for eight AGN at higher redshifts. The results are consistent with previous measurements and the observed dependence on accretion rate, providing a foundation for future research.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yan Lai, Cullan Howlett, Tamara M. Davis
Summary: This study introduces an improved method for constraining the growth rate of structure and reduces the modeling systematic error. The new method is tested on mocks and applied to the SDSS PV catalogue, providing a constraint on the growth rate of structure. The results are consistent with a Planck 2018 cosmological model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Grayling, C. P. Gutierrez, M. Sullivan, P. Wiseman, M. Vincenzi, L. Galbany, A. Moller, D. Brout, T. M. Davis, C. Frohmaier, O. Graur, L. Kelsey, C. Lidman, B. Popovic, M. Smith, M. Toy, B. E. Tucker, Z. Zontos, T. M. C. Abbott, M. Aguena, S. Allam, F. Andrade-Oliveira, J. Annis, J. Asorey, D. Bacon, E. Bertin, S. Bocquet, D. Brooks, A. Carnero Rosell, D. Carollo, M. Carrasco Kind, J. Carretero, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, S. Everett, I Ferrero, D. Friedel, J. Frieman, J. Garcia-Bellido, M. Gatti, D. Gruen, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, G. F. Lewis, U. Malik, M. March, F. Menanteau, R. Miquel, R. Morgan, R. L. C. Ogando, A. Palmese, F. Paz-Chinchon, A. Pieres, A. A. Plazas Malagon, M. Rodriguez-Monroy, A. K. Romer, A. Roodman, E. Sanchez, V Scarpine, I Sevilla-Noarbe, E. Suchyta, G. Tarle, C. To, D. L. Tucker, T. N. Varga
Summary: We present the luminosity functions and host galaxy properties of the Dark Energy Survey (DES) core-collapse supernova (CCSN) sample, consisting of 69 Type II and 50 Type Ibc spectroscopically and photometrically confirmed supernovae over a redshift range 0.045 < z < 0.25. Comparing luminosity functions, the DES and ZTF samples of SNe II are brighter than that of LOSS with significances of 3.0 sigma and 2.5 sigma, respectively. We find that the host galaxies of SNe II in DES are on average bluer than in ZTF, despite having consistent stellar mass distributions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Helene M. Courtois, Khaled Said, Jeremy Mould, T. H. Jarrett, Daniel Pomarede, Tobias Westmeier, Lister Staveley-Smith, Alexandra Dupuy, Tao Hong, Daniel Guinet, Cullan Howlett, Nathan Deg, Bi-Qing For, Dane Kleiner, Baerbel Koribalski, Karen Lee-Waddell, Jonghwan Rhee, Kristine Spekkens, Jing Wang, O. I. Wong, Frank Bigiel, Albert Bosma, Matthew Colless, Tamara Davis, Benne Holwerda, Igor Karachentsev, Renee C. Kraan-Korteweg, Kristen B. W. McQuinn, Gerhardt Meurer, Danail Obreschkow, Edward Taylor
Summary: The WALLABY pilot survey used ASKAP to form integrated 21-cm Hi line spectra in a different manner than traditional single-dish spectra Tully-Fisher measurements. It is crucial to quantify and understand slight differences in order to maximize the use of upcoming large-scale data. The pilot data consists of 614 galaxy spectra, with 472 of high enough quality for potential distance derivation using the Tully-Fisher relation. The resulting Tully-Fisher distances for the Eridanus, Hydra, Norma, and NGC4636 clusters are 21.5, 53.5, 69.4, and 23.0Mpc, respectively, with uncertainties of 5-10 percent.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Santiago Casas, Isabella P. Carucci, Valeria Pettorino, Stefano Camera, Matteo Martinelli
Summary: In this study, we present updated forecasts on parameterised modifications of gravity that can capture deviations of the behaviour of cosmological density perturbations beyond ACDM. We adopt the SKA Observatory (SKAO) as a benchmark for future cosmological surveys at radio frequencies and combine multiple surveys to obtain precise constraints on the deviations from ACDM.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
Benedict Bahr-Kalus, David Parkinson, Eva-Maria Mueller
Summary: By measuring the distribution of quasars, the turnover scale of the matter power spectrum, which is set by the horizon size at the epoch of matter-radiation equality, can be determined in a model-independent statistical manner. This provides an independent standard ruler for studying the physics of the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Caroline Guandalin, Jade Piat, Chris Clarkson, Roy Maartens
Summary: In the era of precision cosmology, it is critical to test the viability of the Cosmological Principle. Recent studies have found a tension between the cosmic microwave background and the large-scale matter distribution, suggesting a possible new cosmic tension and a violation of the Cosmological Principle. However, neglecting redshift evolution can lead to a significant overestimate of the relative velocity amplitude, indicating the need to resolve this theoretical bias.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Simon Deeley, Michael J. Drinkwater, Sarah M. Sweet, Kenji Bekki, Warrick J. Couch, Duncan A. Forbes
Summary: By combining observational and simulation data, it has been found that compact elliptical galaxies have two main formation pathways: stripping from a larger host galaxy and gradual buildup of stellar mass in isolated environments. The proportions are 32% and 68% respectively. The observed differences between isolated and host-associated compact elliptical galaxies can be fully explained by the dominance of different formation pathways in each environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
K. J. Luken, R. P. Norris, X. R. Wang, L. A. F. Park, Y. Guo, M. D. Filipovic
Summary: With the emergence of deep, all-sky radio surveys, the demand for additional data is rapidly increasing to fully utilize the high-quality radio data from surveys such as EMU, GaLactic and Extragalactic All-sky Murchison Widefield Array survey eXtended, Very Large Array Sky Survey, and LOFAR Two-metre Sky Survey. This study compiles and standardizes a radio-selected dataset, combining both northern and southern hemisphere data, and tests various ML algorithms on this dataset. The results show that kNN has the lowest percentage of outliers, providing the best match for the majority of science cases in the EMU survey.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
P. Armstrong, H. Qu, D. Brout, T. M. Davis, R. Kessler, A. G. Kim, C. Lidman, M. Sako, B. E. Tucker
Summary: As the scale of cosmological surveys increases, the complexity in the analyses also rises, making it difficult to derive the underlying principles. In this paper, a statistically rigorous method is presented to test the consistency of contours produced in cosmological analyses. The results show that while there are some differences between the Pippin pipeline and the approximate Neyman construction, the impact is mitigated when combining with other cosmological probes.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
T. M. C. Abbott, M. Aguena, A. Alarcon, O. Alves, A. Amon, F. Andrade-Oliveira, J. Annis, B. Ansarinejad, S. Avila, D. Bacon, E. J. Baxter, K. Bechtol, M. R. Becker, B. A. Benson, G. M. Bernstein, E. Bertin, J. Blazek, L. E. Bleem, S. Bocquet, D. Brooks, E. Buckley-Geer, D. L. Burke, H. Camacho, A. Campos, J. E. Carlstrom, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, R. Cawthon, C. Chang, C. L. Chang, R. Chen, A. Choi, R. Chown, C. Conselice, J. Cordero, M. Costanzi, T. Crawford, A. T. Crites, M. Crocce, L. N. da Costa, C. Davis, T. M. Davis, T. de Haan, J. De Vicente, J. DeRose, S. Desai, H. T. Diehl, M. A. Dobbs, S. Dodelson, P. Doel, C. Doux, A. Drlica-Wagner, K. Eckert, T. F. Eifler, F. Elsner, J. Elvin-Poole, S. Everett, W. Everett, X. Fang, I. Ferrero, A. Ferte, B. Flaugher, P. Fosalba, O. Friedrich, J. Frieman, J. Garcia-Bellido, M. Gatti, E. M. George, T. Giannantonio, G. Giannini, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, N. W. Halverson, I. Harrison, K. Herner, S. R. Hinton, G. P. Holder, D. L. Hollowood, W. L. Holzapfel, K. Honscheid, J. D. Hrubes, H. Huang, E. M. Huff, D. Huterer, B. Jain, D. J. James, M. Jarvis, T. Jeltema, S. Kent, L. Knox, A. Kovacs, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, A. T. Lee, P. -F. Leget, P. Lemos, A. R. Liddle, C. Lidman, D. Luong-Van, J. J. McMahonn, N. MacCrann, M. March, J. L. Marshall, P. Martini, J. McCullough, P. Melchior, F. Menanteau, S. S. Meyer, R. Miquel, L. Mocanu, J. J. Mohr, R. Morgan, J. Muir, J. Myles, T. Natoli, A. Navarro-Alsina, R. C. Nichol, Y. Omori, S. Padin, S. Pandey, Y. Park, F. Paz-Chinchon, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagon, A. Porredon, J. Prat, C. Pryke, M. Raveri, C. L. Reichardt, R. P. Rollins, A. K. Romer, A. Roodman, R. Rosenfeld, A. J. Ross, J. E. Ruhl, E. S. Rykoff, C. Sanchez, E. Sanchez, J. Sanchez, K. K. Schaffer, L. F. Secco, I. Sevilla-Noarbe, E. Sheldon, T. Shin, E. Shirokoff, M. Smith, Z. Staniszewski, A. A. Stark, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, M. A. Troxel, I. Tutusaus, T. N. Varga, J. D. Vieira, N. Weaverdyck, R. H. Wechsler, J. Weller, R. Williamson, W. L. K. Wu, B. Yanny, B. Yin, Y. Zhang, J. Zuntz
Summary: We present cosmological constraints from the analysis of two-point correlation functions between galaxy positions and galaxy lensing measured in Dark Energy Survey (DES) Year 3 data and measurements of cosmic microwave background (CMB) lensing from the South Pole Telescope (SPT) and Planck. The joint analysis of DES-only two-point functions and DES cross-correlations with CMB lensing yields Omega(m) = 0.344 + 0.030 and S-8 equivalent to sigma(8)(Omega(m)/0.3)(0.5) = 0.773 +/- 0.016. Combining with measurements of the CMB lensing autospectrum, we find omega m = 0.306(-0.021)(+0.018) and S-8 = 0.792 +/- 0.012. The CMB lensing cross-correlations provide consistency tests and suggest possible problems with alternative lens galaxy samples.
Article
Physics, Particles & Fields
Sheean Jolicoeur, Roy Maartens, Simthembile Dlamini
Summary: Surveys of the matter distribution contain information on potential non-Gaussianity in the early Universe. By combining different surveys, the cosmic variance can be reduced and the precision of primordial non-Gaussianity can be improved. A combination of optical galaxy surveys and 21 cm intensity mapping surveys can deliver precision comparable to that from the CMB.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Nikhel Gupta, Zeeshan Hayder, Ray P. Norris, Minh Huynh, Lars Petersson, X. Rosalind Wang, Heinz Andernach, Barbel S. Koribalski, Miranda Yew, Evan J. Crawford
Summary: This work discusses the use of a weakly-supervised deep learning algorithm to reduce the cost of labeling pixel-level masks for complex radio galaxies. The algorithm is trained on weak class-level labels to obtain class activation maps, which are refined using an inter-pixel relations network. Using data from the Australian Square Kilometre Array Pathfinder telescope, the algorithm achieves high accuracy in predicting pixel-level information and the positions of infrared host galaxies.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)