Results 51 to 60 of about 47,826 (245)

Recovering the real-space correlation function from photometric redshift surveys

, 2008
Measurements of clustering in large-scale imaging surveys that make use of photometric redshifts depend on the uncertainties in the redshift determination.
Alberto Fernández-Soto, Baum, Benítez, Benítez, Blake, Coe, Connolly, Davis, Enn Saar, Fernández-Soto, Fernández-Soto, Fernández-Soto, Hawkins, Ilbert, Ivan Suhhonenko, Koo, Landy, Madgwick, Martinez, Martínez, Moles, Pablo Arnalte-Mur, Padmanabhan, Pekka Heinämäki, Phleps, Saunders, Stoyan, Vicent J. Martínez, Wolf, Zehavi, Zehavi, Zehavi   +31 more
core   +1 more source

Photometric redshifts: estimating their contamination and distribution using clustering information [PDF]

, 2010
We present a new technique to estimate the level of contamination between photometric redshift bins. If the true angular cross-correlation between redshift bins can be safely assumed to be zero, any measured cross-correlation is a result of contamination
Benjamin, Jonathan, Kilbinger, Martin, Ménard, Brice, Van Waerbeke, Ludovic   +3 more
core   +1 more source

Probabilistic Forward Modeling of Galaxy Catalogs with Normalizing Flows

The Astronomical Journal
Evaluating the accuracy and calibration of the redshift posteriors produced by photometric redshift (photo- z ) estimators is vital for enabling precision cosmology and extragalactic astrophysics with modern wide-field photometric surveys.
John Franklin Crenshaw, J. Bryce Kalmbach, Alexander Gagliano, Ziang Yan, Andrew J. Connolly, Alex I. Malz, Samuel J. Schmidt, The LSST Dark Energy Science Collaboration   +7 more
doaj   +1 more source

Temperature‐Dependent Zinc Oxide Cathodoluminescence: Toward Compact Wavelength‐Tunable Solid‐State Photoionization Sources

Advanced Optical Materials, EarlyView.
A proof‐of‐concept of a thermally‐tunable cathodoluminescence‐based light source is demonstrated using a wide‐bandgap z‐cut ZnO crystal as anode, resulting in the ultraviolet (UV) emission peak shifting from 398 nm to ~409 nm (3.115‐3.032 eV). Our results establish the feasibility of a compact, field‐deployable UV source with potential for gas sensing ...
Rui M. R. Pinto, Aritz Retolaza, João Cunha, Pedro Matos, Júlio Silva, Diana Silva, Rosana Alves Dias, K. B. Vinayakumar   +7 more
wiley   +1 more source

Data-driven Cosmology from Three-dimensional Light Cones

The Astrophysical Journal, 2023
We present a data-driven technique to analyze multifrequency images from upcoming cosmological surveys mapping large sky area. Using full information from the data at the two-point level, our method can simultaneously constrain the large-scale structure (
Yun-Ting Cheng, Benjamin D. Wandelt, Tzu-Ching Chang, Olivier Doré   +3 more
doaj   +1 more source

The removal of shear-ellipticity correlations from the cosmic shear signal: Influence of photometric redshift errors on the nulling technique

, 2009
Cosmic shear is regarded one of the most powerful probes to reveal the properties of dark matter and dark energy. To fully utilize its potential, one has to be able to control systematic effects down to below the level of the statistical parameter errors.
Abdalla, Amara, Amara, B. Joachimi, Bacon, Benjamin, Bernstein, Bridle, Bridle, Brown, Catelan, Crittenden, Croft, Eifler, Eisenstein, Fu, Heavens, Hetterscheidt, Heymans, Heymans, Heymans, Hirata, Hirata, Hoekstra, Hoekstra, Hu, Hu, Hu, Huterer, Huterer, Ilbert, Jarvis, Jing, Joachimi, Joachimi, Kaiser, Kim, King, King, King, Lee, Ma, Mackey, Mandelbaum, Massey, Munshi, Okumura, Okumura, P. Schneider, Peacock, Pen, Schneider, Schäfer, Semboloni, Semboloni, Simon, Smail, Spergel, Sugiyama, Taburet, Takada, Taylor, Tegmark, Thomas, van den Bosch, van Waerbeke, Wittman   +66 more
core   +1 more source

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Characterizing and Propagating Modeling Uncertainties in Photometrically-Derived Redshift Distributions

, 2011
The uncertainty in the redshift distributions of galaxies has a significant potential impact on the cosmological parameter values inferred from multi-band imaging surveys.
Albrecht, Assef, Assef, Augusta Abrahamse, Bassett, Baum, Benitez, Brammer, Bridle, Budavári, Giavalisco, Hearin, Heavens, Howell, Hu, Hu Zhan, Ilbert, J. Anthony Tyson, Lloyd Knox, LSST Science Collaborations, Ma, Ma, MacQueen, Matthews, Nishizawa, Paul Thorman, Perlmutter, Riess, Samuel Schmidt, Schneider, Sun, Wang, Wittman, Zhan, Zhan   +34 more
core   +1 more source

Self‐Controlled Automated Strategy for the Synthesis of Gold Nanorods With Fine‐Tuned Longitudinal Absorption

Chemistry – A European Journal, EarlyView.
This work proposes an innovative strategy which allows to synthesize precisely tuned gold nanorods starting from nonpurified dispersions with variable aspect‐ratio. The etching process is under direct control and can be stopped at any time by oxidizer quenching, providing stable dispersions.
Giordano Zanoni, Elisabetta Collini, Fabrizio Mancin   +2 more
wiley   +1 more source

Lewis Acid‐Triggered Spatiotemporally Controllable Ring Opening in a Classic Rhodamine Featuring Φ = 95% Emission

Small Science, EarlyView.
This work reports a breakthrough in rhodamine activation via an elegant Lewis acid coordination strategy. It induces ring opening in spirolactone rhodamine TMR, generating exceptional fluorescence (quantum yields up to 95%) without destructive modifications or structural modification. The method preserves full photocontrol, reversibility, and real‐time
Quanchun Sun, Liancheng He, Tao Wang, Haiyan Cui, Xinping Wang   +4 more
wiley   +1 more source