Results 31 to 40 of about 121,582 (238)

First tests of a 1 megapixel near-infrared avalanche photodiode array for ultra-low background space astronomy

X-Ray, Optical, and Infrared Detectors for Astronomy X, 2022
Spectroscopy of Earth-like exoplanets and ultra-faint galaxies are priority science cases for the coming decades. Here, broadband source flux rates are measured in photons per square meter per hour, imposing extreme demands on detector performance, including dark currents lower than 1 e-/pixel/kilosecond, read noise less than 1 e-/pixel/frame, and ...
Claveau, Charles-Antoine, Bottom, Michael, Jacobson, Shane, Hodapp, Klaus, Walk, Aidan, Loose, Markus, Baker, Ian, Zemaityte, Egle, Hicks, Matthew, Barnes, Keith, Powell, Richard, Bradley, Ryan, Moore, Eric   +12 more
openaire   +2 more sources

Development of a Monitoring System for an Infrared Camera [PDF]

Journal of Astronomy and Space Sciences, 2006
The KASINICS (KASI Near-Infrared Camera System) is a ground-based instrument developed by the Korea Astronomy and Space Science Institute (KASI). We developed a temperature and vacuum monitoring system for operating the KASINICS.
Sang-Mok Cha, Bongkon Moon, Ho Jin, In-Soo Yuk, Uk-Won Nam, Sungho Lee, Yungsik Park, Seounghyun Cho, Seungwon Mok, Chun-Hwey Kim   +9 more
doaj   +1 more source

Near-Infrared Properties of Metal-poor Globular Clusters in the Galactic Bulge Direction [PDF]

, 2010
Aims. J, H, and K' images obtained from the near-infrared imager CFHTIR on the Canada-France-Hawaii Telescope are used to derive the morphological parameters of the red giant branch (RGB) in the near-infrared color-magnitude diagrams for 12 metal-poor ...
Bellazzini, Bonatto, C. Chung, Carpenter, Carraro, Carreta, Cho, Cioni, Cioni, Côté, D.-W. Lim, Dinescu, Dinescu, Ferraro, Ferraro, Froebrich, Fusi Pecci, H.-I. Kim, Harris, I.-G. Shin, Iben, Ivanov, J.-H. Park, J.-W. Kim, Kim, Kim, Kobulnicky, Kuchinski, Lee, Lee, Madore, McWilliam, Minniti, Montegriffo, Montegriffo, Nakasato, Origlia, Ortolani, Ortolani, Ortolani, Piotto, Rich, Rieke, S.-H. Chun, Salaris, Salaris, Schlegel, Stephens, Stetson, Stetson, Thomas, Valenti, Valenti, Valenti, Valenti, Valenti, Valenti, W. Han, Willman, Y.-J. Sohn, Yi, Yi, Zinn, Zoccali   +63 more
core   +2 more sources

Alignment of the grating wheel mechanism for a ground-based cryogenic near-infrared astronomy instrument [PDF]

SPIE Proceedings, 2003
We describe the population, optomechanical alignment, and alignment verification of near-infrared gratings on the grating wheel mechanism (GWM) for the Infrared Multi-Object Spectrometer (IRMOS). IRMOS is a cryogenic (80 K), principle investigator-class instrument for the 2.1 m and Mayall 3.8 m telescopes at Kitt Peak National Observatory, and a MEMS ...
Sharon M. Gutkowski, Raymond G. Ohl, Jason E. Hylan, John G. Hagopian, Stephen E. Kraft, J. E. Mentzell, Joseph A. Connelly, Joseph P. Schepis, Leroy M. Sparr, Matthew A. Greenhouse, John W. MacKenty   +10 more
openaire   +1 more source

Halide‐Dependent Photoluminescence and Heavy‐Atom Effects in Low‐Melting Organic–Inorganic Manganese Halides

Advanced Functional Materials, EarlyView.
Two pyridinium‐based ionic liquid templated hybrid manganese halides, (C4Py)2[MnCl4] and (C4Py)2[MnBr4], display similar bulk structures but show significantly different photoluminescence behaviors due to the bromine heavy‐atom effect. Their stable local Mn environments remain intact even in the molten state, allowing applications such as luminescence ...
Biswajit Bhattacharyya, Christian Balischewski, Jiyong Kim, Tiago Duarte, Lianshe Fu, Rute A.S. Ferreira, Alkit Beqiraj, Iuliia Mikulska, Diego Gianolio, Eric Sperlich, Felix Stete, Wouter Koopman, Christina Günter, Katlen Brennenstuhl, Daniel Van Opdenbosch, Cordt Zollfrank, Armin Wedel, Beth J. Murray, Małgorzata Swadźba‐Kwaśny, Tillmann Klamroth, Michael U. Kumke, Verónica de Zea Bermudez, Andreas Taubert   +22 more
wiley   +1 more source

The VMC survey - XI : Radial Stellar Population Gradients in the Galactic Globular Cluster 47 Tucanae [PDF]

, 2014
Copyright American Astronomical SocietyWe present a deep near-infrared color-magnitude diagram of the Galactic globular cluster 47 Tucanae, obtained with the Visible and Infrared Survey Telescope for Astronomy (VISTA) as part of the VISTA near-infrared Y,
Anderson, Andrés E. Piatti, Arnaboldi, Bi-Qing For, Boyer, Chengyuan Li, Chuchu Wang, Cordero, D'Antona, de Grijs, Dotter, Gisella Clementini, Goldsbury, Goudfrooij, Harris, Jacco Th. van Loon, Jim Emerson, Kenji Bekki, Koch, Leo Girardi, Li, Li, Licai Deng, Mackey, Mackey, Marcella Marconi, Marco Gullieuszik, Maria-Rosa L. Cioni, Martin A. T. Groenewegen, Marín-Franch, McDonald, McLaughlin, McWillian, Milone, Milone, Milone, Nataf, Norris, Piotto, Piotto, Piotto, Platais, Qing, Ramírez, Renzini, Richard de Grijs, Roald Guandalini, Salaris, Schlafly, Schlegel, Sollima, Stefano Rubele, Trager, Vandenberg, Vincenzo Ripepi, Wall, Yang, Zoccali   +57 more
core   +3 more sources

Elucidating the Role of Surface Ligands on the Oxidative Etching of Au Bipyramids During Photothermia Using Liquid Cell Transmission Electron Microscopy

Advanced Functional Materials, EarlyView.
Gold bipyramids can act as efficient plasmonic nanoheaters, but they often reshape during laser heating. This study shows that oxygen nanobubbles drive oxidative etching and that surface ligands control stability. CTAB‐ and citrate‐coated particles blunt and lose optical performance, whereas polystyrene sulfonate preserves shape and heating by ...
Irene López‐Sicilia, Valentina Girelli Consolaro, Sophie Marbach, Nancy Rahbany, Grégoire Petit, Ovidiu Ersen, Juan J. Giner‐Casares, Ali Abou‐Hassan   +7 more
wiley   +1 more source

The Second and Third Data Releases from the UKIRT Hemisphere Survey

The Astronomical Journal
This paper describes the second and third data releases (DR2 and DR3, respectively) from the ongoing United Kingdom Infrared Telescope Hemisphere Survey (UHS).
Adam C. Schneider, Frederick J. Vrba, Justice Bruursema, Jeffrey A. Munn, Mike Irwin, Mike Read, Watson Varricatt, Tom Kerr, Klaus Hodapp, Simon Dye, Stephen J. Williams, Andrew T. Cenko, Trudy M. Tilleman, Marc A. Murison, Barry Rothberg, Scott Dahm, Bryan Dorland, Andy Lawrence, Kenneth C. Chambers   +18 more
doaj   +1 more source

A new near-IR window of low extinction in the Galactic plane [PDF]

, 2018
Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO. Comments: 6 pages, 6 figures. Accepted for publication in Astronomy & AstrophysicsAims.
Alonso-García, Javier, Barbá, Rodolfo, Gonzalez, Oscar A., Irwin, Mike, Kammers, Roberto, Lucas, Philip, Majaess, Daniel, Minniti, Dante, Rejkuba, Marina, Saito, Roberto K., Valenti, Elena   +10 more
core   +5 more sources

Versatile Magneto‐Dielectric Response of Epitaxial Thin Films of the High Entropy Oxide Perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3

Advanced Materials, EarlyView.
The magnetic high entropy oxide perovskite Nd(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 exhibits a substantially large dielectric constant (εr) at room temperature, which shows distinct anionic and cationic contributions in the form of zero and finite bias peaks, respectively, down to its magnetic transition temperature (Tmag).
Roxana Capu, Ryan Thompson, C. Willem Rischau, Marli R. Cantarino, Premysl Marsik, Sergey L. Bud'ko, Neven Biškup, María Varela, Yurii G. Pashkevich, Serhii M. Orel, Thomas Prokscha, Andreas Suter, Jiangtao Zhao, Ugwumsinachi Oji, Marco Bonura, Peter Bencok, Zaher Salman, Stefano Gariglio, Christian Bernhard, Subhrangsu Sarkar   +19 more
wiley   +1 more source