Browsing by Author "Alves, O."

Now showing 1 - 3 of 3
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    Cosmology from cross-correlation of ACT-DR4 CMB lensing and DES-Y3 cosmic shear
    (2024) Shaikh, S.; Harrison, I; van Engelen, A.; Alves, O.; Marques, G. A.; Abbott, T. M. C.; Aguena, M.; Amon, A.; An, R.; Bacon, D.; Battaglia, N.; Becker, M. R.; Bernstein, G. M.; Bertin, E.; Blazek, J.; Bond, J. R.; Brooks, D.; Burke, D. L.; Calabrese, E.; Carnero Rosell, A.; Carretero, J.; Cawthon, R.; Chang, C.; Chen, R.; Choi, A.; Choi, S. K.; da Costa, L. N.; Pereira, M. E. S.; Darwish, O.; Davis, T. M.; Desai, S.; Devlin, M.; Diehl, H. T.; Doel, P.; Doux, C.; Elvin-Poole, J.; Farren, G. S.; Ferraro, S.; Ferrero, I; Ferte, A.; Flaugher, B.; Frieman, J.; Garcia-Bellido, J.; Gatti, M.; Giannini, G.; Giardiello, S.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Hill, J. C.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; Huffenberger, K. M.; Huterer, D.; James, D. J.; Jarvis, M.; Jeffrey, N.; Jense, H. T.; Knowles, K.; Kim, J.; Kramer, D.; Lahav, O.; Lee, S.; Lima, M.; MacCrann, N.; Madhavacheril, M. S.; Marshall, J. L.; McCullough, J.; Mehta, Y.; Mena-Fernandez, J.; Miquel, R.; Mohr, J. J.; Moodley, K.; Myles, J.; Navarro-Alsina, A.; Newburgh, L.; Niemack, M. D.; Omori, Y.; Pandey, S.; Partridge, B.; Pieres, A.; Malagon, A. A. Plazas; Porredon, A.; Prat, J.; Qu, F. J.; Robertson, N.; Rollins, R. P.; Roodman, A.; Samuroff, S.; Sanchez, C.; Sanchez, E.; Cid, D. Sanchez; Secco, L. F.; Sehgal, N.; Sheldon, E.; Sherwin, B. D.; Shin, T.; Sifon, C.; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Troxel, M. A.; Tutusaus, I; Vargas, C.; Weaverdyck, N.; Wiseman, P.; Yamamoto, M.; Zuntz, J.
    Cross-correlation between weak lensing of the Cosmic Microwave Background (CMB) and weak lensing of galaxies offers a way to place robust constraints on cosmological and astrophysical parameters with reduced sensitivity to certain systematic effects affecting individual surveys. We measure the angular cross-power spectrum between the Atacama Cosmology Telescope (ACT) DR4 CMB lensing and the galaxy weak lensing measured by the Dark Energy Survey (DES) Y3 data. Our baseline analysis uses the CMB convergence map derived from ACT-DR4 and Planck data, where most of the contamination due to the thermal Sunyaev Zel'dovich effect is removed, thus avoiding important systematics in the cross-correlation. In our modelling, we consider the nuisance parameters of the photometric uncertainty, multiplicative shear bias and intrinsic alignment of galaxies. The resulting cross-power spectrum has a signal-to-noise ratio = 7.1 and passes a set of null tests. We use it to infer the amplitude of the fluctuations in the matter distribution (S-8 equivalent to sigma(8) (Omega(m)/0.3)(0.5) = 0.782 +/- 0.059) with informative but well-motivated priors on the nuisance parameters. We also investigate the validity of these priors by significantly relaxing them and checking the consistency of the resulting posteriors, finding them consistent, albeit only with relatively weak constraints. This cross-correlation measurement will improve significantly with the new ACT-DR6 lensing map and form a key component of the joint 6x2pt analysis between DES and ACT.
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    Giant spin-charge conversion driven by nanoscopic particles of Ag in Pt
    (2017) Alves, O.; Silva, E.; Gamino, M.; Cunha, R.; Mendes, J.; Rodríguez Suárez, Roberto; Rezende, S.; Azevedo, A.
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    Kinematic Sunyaev-Zel'dovich effect with ACT, DES, and BOSS: A novel hybrid estimator
    (2023) Mallaby-Kay, M.; Amodeo, S.; Hill, J. C.; Aguena, M.; Allam, S.; Alves, O.; Annis, J.; Battaglia, N.; Battistelli, E. S.; Baxter, E. J.; Bechtol, K.; Becker, M. R.; Bertin, E.; Bond, J. R.; Brooks, D.; Calabrese, E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Choi, A.; Crocce, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Desai, S.; Dietrich, J. P.; Doel, P.; Doux, C.; Drlica-Wagner, A.; Dunkley, J.; Elvin-Poole, J.; Everett, S.; Ferraro, S.; Ferrero, I.; Frieman, J.; Gallardo, P. A.; Garcia-Bellido, J.; Giannini, G.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; James, D. J.; Kosowsky, A.; Kuehn, K.; Lokken, M.; Louis, T.; Marshall, J. L.; McMahon, J.; Mena-Fernandez, J.; Menanteau, F.; Miquel, R.; Moodley, K.; Mroczkowski, T.; Naess, S.; Niemack, M. D.; Ogando, R. L. C.; Page, L.; Pandey, S.; Pieres, A.; Malagon, A. A. Plazas; Raveri, M.; Rodriguez-Monroy, M.; Rykoff, E. S.; Samuroff, S.; Sanchez, E.; Schaan, E.; Sevilla-Noarbe, I.; Sheldon, E.; Sifon, C.; Smith, M.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; To, C.; Vargas, C.; Vavagiakis, E. M.; Weaverdyck, N.; Weller, J.; Wiseman, P.; Yanny, B.
    The kinematic and thermal Sunyaev-Zel'dovich (kSZ and tSZ) effects probe the abundance and thermodynamics of ionized gas in galaxies and clusters. We present a new hybrid estimator to measure the kSZ effect by combining cosmic microwave background temperature anisotropy maps with photometric and spectroscopic optical survey data. The method interpolates a velocity reconstruction from a spectroscopic catalog at the positions of objects in a photometric catalog, which makes it possible to leverage the high number density of the photometric catalog and the precision of the spectroscopic survey. Combining this hybrid kSZ estimator with a measurement of the tSZ effect simultaneously constrains the density and temperature of free electrons in the photometrically selected galaxies. Using the 1000 deg2 of overlap between the Atacama Cosmology Telescope (ACT) Data Release 5, the first three years of data from the Dark Energy Survey (DES), and the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 12, we detect the kSZ signal at 4.8 & sigma; and reject the null (no-kSZ) hypothesis at 5.1 & sigma;. This corresponds to 2.0 & sigma; per 100,000 photometric objects with a velocity field based on a spectroscopic survey with 1=5th the density of the photometric catalog. For comparison, a recent ACT analysis using exclusively spectroscopic data from BOSS measured the kSZ signal at 2.1 & sigma; per 100,000 objects. Our derived constraints on the thermodynamic properties of the galaxy halos are consistent with previous measure-ments. With future surveys, such as the Dark Energy Spectroscopic Instrument and the Rubin Observatory Legacy Survey of Space and Time, we expect that this hybrid estimator could result in measurements with significantly better signal-to-noise than those that rely on spectroscopic data alone.