Results 21 to 30 of about 553,609 (298)

The 5.25 & 5.7 $\mu$m Astronomical Polycyclic Aromatic Hydrocarbon Emission Features [PDF]

, 2008
Astronomical mid-IR spectra show two minor PAH features at 5.25 and 5.7 $\mu$m (1905 and 1754 cm$^{\rm - 1}$) that hitherto have been little studied, but contain information about the astronomical PAH population that complements that of the major ...
Boersma, C., Tielens, A. G. G. M., Bauschlicher, C. W., Mattioda, A. L., Bauschlicher Jr., C. W., Allamandola, L. J., Peeters, E.   +6 more
core   +1 more source

First Constraints on Helium +He3 Evolution in z = 3–4 Using the 8.67 GHz Hyperfine Transition

The Astrophysical Journal, 2023
We present the first constraints on the cross-correlation power spectrum of the He ii ( ^+ He ^3 ) signal strength using the redshifted 8.67 GHz hyperfine transition between z = 2.9 and 4.1 and with interferometric data obtained from the public archive ...
Cathryn M. Trott, Randall B. Wayth
doaj   +1 more source

The Benefits of Using XML Technologies in Astronomical Data Retrieval and Interpretation [PDF]

, 2016
This paper describes a solution found during recent research that could provide improvements in the efficiency, reliability and cost of retrieving stored astronomical data.
Doicu, Adrian, Altieri, Bruno, Efremenko, Dmitry, Rotzoll, Henry, Soille, Pierre, Boxhoorn, Danny, Marchetti, Pier Giorgio, Reck, Christoph, Datcu, Mihai, Cui, Shiyong, Benoit, A, Beech, Guy, RODRIGUEZ ASERETTO Roque Dario, Buenadicha, Guillermo, Valentijn, E, Alessandro Bemporad, Deborah Busonero, Hofmann, Mathias, Nieto, Sara, Espinoza-Molina, Daniela, Belikov, Andrey, Ben-Amar, Chokri, Heinen, Torsten, European Commission, Joint Research Centre, Ben Hamida, Amina, SOILLE Pierre, Williams, Owen, Andrea Fonti, Dumitru, Corneliu, Salgado, Jesus, Dengler, Klaus, VASILEV Veselin, Valentijn, E; id_orcid, Campuzano, Gina, Winkler, Mario, de Teodoro, Pilar, Loyola, Diego, Schwarz, Gottfried, Ruben De March, Tsyganov, Andrey, Trautmann, Thomas, McFarland, John, Rosario Messineo, Francesco Vaccarino, Lambert, Patrick, BURGER Armin, Angelo Fabio Mulone, Mario Lattanzi, Manilici, Vlad, Droge, Bob, SYRRIS Vasileios, Droge, Bob; id_orcid, Buckl, Bernhard, Briese, Christian, Skriver, Henning, Elefante, Stefano, Stephan, Meißl, Giannecchini, Simone, Ramos, Jose Julio, Mücke, Werner, Kiemle, Stephan, JULEA Andreea Maria, Conradsen, Knut, Nielsen, Allan Aasbjerg, PESARESI Martino, Aspetsberger, Michael, Becedas, Jonathan, Naeimi, Vahid, Wagner, Wolfgang, Cao, Senmao   +69 more
core   +2 more sources

Impact of PDP on Training for Astronomical Instrumentation [PDF]

, 2022
The Institute for Scientist and Engineer Educators (ISEE) Professional Development Program (PDP) has led to the generation of several activities geared toward training in astronomical instrumentation. These include activities developed for the Center for
Konopacky, Quinn, Lu, Jessica R, Lanz, Alicia, Do, Tuan   +3 more
core   +1 more source

The NASA Astrophysics Data System: Free Access to the Astronomical Literature On-Line and through Email [PDF]

, 2001
The Astrophysics Data System (ADS) provides access to the astronomical literature through the World Wide Web. It is a NASA funded project and access to all the ADS services is free to everybody world-wide.
Kurtz, Michael J., Eichhorn, Guenther, Grant, Carolyn S., Accomazzi, Alberto, Murray, Stephen S.   +4 more
core   +1 more source

Infrared fibres in astronomical instrumentation [PDF]

, 1995
For several years multi-object spectroscopy systems have been available for carrying out survey work in the visible region, but until very recently there has not been a system for the near infrared region.
Haynes, Roger
core  

Atom Probe Tomography as an Emerging Tool for Understanding Defect‑Driven Mechanisms in HfO2‑Based Ferroelectrics

Advanced Functional Materials, EarlyView.
This Perspective highlights atom probe tomography as a powerful tool for understanding the atomic‐scale defect chemistry in HfO2‐based ferroelectrics. 3D mapping of dopants, point defects, and interface chemistry can provide new insight into defect‐driven mechanisms underpinning the ferroelectricity in the system and guide the design of more reliable ...
Kasper Hunnestad, Catherine Dubourdieu, Alexei Gruverman, Dennis Meier   +3 more
wiley   +1 more source

Motion Planning for the Robotic Fiber Positioners of the Large Sky Area Multiobject Fiber Spectrocopy Telescope

The Astronomical Journal
The Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) is one of the most effective multiobject spectroscopic instruments. Its survey efficiency is guaranteed by simultaneously positioning multiple fibers via 4000 robotic fiber positioners
Feifan Zhang, Baolong Chen, Yu Wang, Zhenwan Peng, Zengxiang Zhou, Jianping Wang   +5 more
doaj   +1 more source

Imaging and Characterization of Extrasolar Planets with the Next Generation of Space Telescopes

Geosciences, 2018
The study and characterization of the exoplanets’ atmospheres and composition is in its infancy. The large facilities that will make feasible to image an exo-Earth are currently under study.
Ana I. Gómez de Castro
doaj   +1 more source

An Optical Distortion Solution for the Keck I OSIRIS Imager

The Astronomical Journal, 2023
The astrometric precision and accuracy of an imaging camera is often limited by geometric optical distortions. These must be calibrated and removed to measure precise proper motions, orbits, and gravitationally lensed positions of interesting ...
Matthew S. R. Freeman, Jessica R. Lu, Jim Lyke, Abhimat Gautam, Renate Kupke, Andrea Ghez, Shoko Sakai, Jay Anderson, Andrea Bellini   +8 more
doaj   +1 more source