Results 141 to 150 of about 4,302,843 (380)

Photometric Redshift Forecast for the 7-Dimensional Sky Survey

The Astrophysical Journal
We investigate the expected accuracy of redshifts that can be obtained using low-resolution spectroscopic (medium-band) data from the 7-Dimensional Sky Survey (7DS). By leveraging 40 densely sampled filters with widths of FWHM = 25 nm, we create 7DS mock
Eunhee Ko, Myungshin Im, Yujin Yang, Ji Hoon Kim, Seong-Kook Lee, Gregory S.-H. Paek   +5 more
doaj   +1 more source

Populating dark matter haloes with galaxies: comparing the 2dFGRS with mock galaxy redshift surveys [PDF]

, 2003
In two recent papers, we developed a powerful technique to link the distribution of galaxies to that of dark matter haloes by considering halo occupation numbers as a function of galaxy luminosity and type.
Xiaohu Yang, Xiaohu Yang, H. Mo, H. Mo, Y. Jing, F. V. D. Bosch, Y. Chu   +6 more
semanticscholar   +1 more source

RoHS‐Compliant, Cu‐Zn‐In‐Se‐Based Core/Multi‐shell Quantum Dots with Efficient and Tunable Short‐Wave Infrared Emission

Advanced Functional Materials, EarlyView.
An innovative combination of size‐controlled template synthesis, partial cation exchange reactions, and dual shell passivation offers a new class of RoHS‐compliant, heavy metal‐free Cu‐Zn‐In‐Se/ZnS/Al2O3 core/shell/shell quantum dots (QDs), exhibiting long‐range tunability, highly efficient SWIR emission with remarkably narrow photoluminescence ...
Avijit Saha, Morena Cervino, Hossein Roshan, René Hübner, Angelika Wrzesińska‐Lashkova, Christine Steinbach, Yana Vaynzof, Francesco Di Stasio, Vladimir Lesnyak   +8 more
wiley   +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

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

The Southern Sky Redshift Survey [PDF]

The Astrophysical Journal, 1988
The general characteristics of the space distribution of galaxies in the SSRS sample, covering the southern Galactic cap, are examined, and maps of the space distribution are presented. The sample consists of 2028 galaxies in an area of 1.75 sr with declination south of -17.5 deg and galactic latitude below -30 deg.
L. Nicolaci da Costa, P. S. Pellegrini, W. L. W. Sargent, J. Tonry, M. Davis, A. Meiksin, David W. Latham, J. W. Menzies, I. A. Coulson   +8 more
openaire   +1 more source

Self‐Trapped Hole Migration and Defect‐Mediated Thermal Quenching of Luminescence in α‐ and β‐Ga2O3

Advanced Functional Materials, EarlyView.
Temperature‐dependent photoluminescence and first‐principles calculations reveal self‐trapped hole migration as the microscopic origin of thermal quenching in α‐ and β‐Ga2O3. The low migration barrier in α‐Ga2O3 enables defect trapping and enhances blue luminescence, while the higher barrier in β‐Ga2O3 preserves ultraviolet emission at elevated ...
Nima Hajizadeh, Ymir K. Frodason, Clemens Petersen, Benjamin M. Janzen, Luca Sung‐Min Choi, Nils Bernhardt, Felix Nippert, Zbigniew Galazka, Joel B. Varley, Holger von Wenckstern, Lasse Vines, Markus R. Wagner   +11 more
wiley   +1 more source

JWST Discovery of a High-redshift Tidal Disruption Event Candidate in COSMOS-Web

The Astrophysical Journal
The rates and properties of tidal disruption events (TDEs) provide valuable insights into their host galaxy central stellar densities and the demographics of their central supermassive black holes. TDEs have been observed only at low redshifts ( z  ≲ 1),
Mitchell Karmen, Suvi Gezari, Erini Lambrides, Hollis B. Akins, Colin Norman, Caitlin M. Casey, Justin Pierel, David Coulter, Armin Rest, Ori Dr. Fox, Yukta Ajay, Natalie Allen, Nicole E. Drakos, Seiji Fujimoto, Sebastian Gomez, Ghassem Gozaliasl, Olivier Ilbert, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Zachary G. Lane, Henry Joy McCracken, Louise Paquereau, Jason Rhodes, Brant E. Robertson, Marko Shuntov, Matthew R. Siebert, Sune Toft, Thomas Wevers, Yossef Zenati   +28 more
doaj   +1 more source

Accuracy of the Photometric Redshifts of Brightest Cluster Galaxies Identified in the CFHTLS-W1

Journal of Advanced Research in Natural and Applied Sciences
We determine the accuracy of photometric redshifts for the brightest cluster galaxies (BCGs) identified in the W1 field of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS).
Sinan Aliş
doaj   +1 more source

Cosmological Constraints with Clustering-Based Redshifts

, 2016
We demonstrate that observations lacking reliable redshift information, such as photometric and radio continuum surveys, can produce robust measurements of cosmological parameters when empowered by clustering-based redshift estimation. This method infers
Kovetz, Ely D., Raccanelli, Alvise, Rahman, Mubdi   +2 more
core   +1 more source