Results 31 to 40 of about 5,796,492 (306)

Astronomical observations: a guide for allied researchers

The Open Journal of Astrophysics, 2019
Observational astrophysics uses sophisticated technology to collect and measure electromagnetic and other radiation from beyond the Earth. Modern observatories produce large, complex datasets and extracting the maximum possible information from them ...
Pauline Barmby
doaj   +1 more source

PROTOCALC, a W-band Polarized Calibrator for Cosmic Microwave Background Telescopes: Application to Simons Observatory and CLASS

The Astrophysical Journal Supplement Series
Current- and next-generation cosmic microwave background (CMB) experiments will measure polarization anisotropies with unprecedented sensitivities. The need for high precision in these measurements underscores the importance of gaining a comprehensive ...
Gabriele Coppi, Nadia Dachlythra, Federico Nati, Rolando Dünner-Planella, Alexandre E. Adler, Josquin Errard, Nicholas Galitzki, Yunyang Li, Matthew A. Petroff, Sara M. Simon, Ema Tsang King Sang, Amalia Villarrubia Aguilar, Edward J. Wollack, Mario Zannoni   +13 more
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Nearly a decade of groundbreaking speckle interferometry at the international Gemini observatory

Frontiers in Astronomy and Space Sciences
Since its inception, speckle interferometry has revolutionized high-resolution astronomical imaging, overcoming atmospheric challenges to achieve the diffraction limits of telescopes. Almost a decade ago, in 2018, a pair of speckle cameras – ‘Alopeke and
Steve B. Howell, Clara E. Martínez-Vázquez, Elise Furlan, Nicholas J. Scott, Rachel A. Matson, Colin Littlefield, Colin Littlefield, Catherine A. Clark, Kathryn V. Lester, Zachary D. Hartman, David R. Ciardi, Sarah J. Deveny, Sarah J. Deveny   +12 more
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The GMRT High Resolution Southern Sky Survey for Pulsars and Transients. VI. Discovery of Nulling, Localization, and Timing of PSR J1244–4708

The Astrophysical Journal, 2023
Many pulsars in the known population exhibit nulling, which is characterized by a sudden cessation and subsequent restoration of radio emission. In this work, we present the localization, timing, and emission properties of a pulsar discovered by the GMRT
S. Singh, J. Roy, Shyam S. Sharma, B. Bhattacharyya, S. Kudale   +4 more
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Neurochemical Endpoints to Inform Early‐Stage Trials of Spinocerebellar Ataxia 2 and 3 in a Multisite Setting

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Neurochemical levels measured by brain MR spectroscopy (MRS) have been proposed as endpoints for clinical trials in early‐stage spinocerebellar ataxia (SCA) trials. We tested their trial‐readiness by quantifying neurochemicals in three affected brain regions in early‐stage cohorts of SCA2 and SCA3, examining their reproducibility in ...
James M. Joers, Yaqiao Wei, Dinesh K. Deelchand, Adam Berrington, Young Woo Park, Guita Banan, Michal Povazan, Jens T. Rosenberg, André J. W. van der Kouwe, Tetsuo Ashizawa, Khalaf O. Bushara, Chiadi U. Onyike, Sub H. Subramony, Jeremy D. Schmahmann, Brian J. Soher, Peter B. Barker, Thomas H. Mareci, Eva‐Maria Ratai, Lynn E. Eberly, Gülin Öz   +19 more
wiley   +1 more source

Modeling the Wavelength Dependence of Pixel Response Nonuniformity of a CCD Sensor

The Astronomical Journal
Precision measurements in astronomy require stringent control of systematics such as those arising from imperfect correction of sensor effects.
Zun Luo, Wei Du, Baocun Chen, Xianmin Meng, Hu Zhan   +4 more
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Dark Matter Indirect Detection [PDF]

EPJ Web of Conferences, 2020
This is an overview of recent developments and future prospects in the search for dark matter and new physics with astronomical and astro-particle techniques.
Profumo Stefano
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Analysis of EMCCD gain estimation techniques for use in astronomical instruments

, 2023
Electron-multiplied Charge Coupled Devices (EMCCDs) are used in many astro nomical instruments where they provide much improved signal to noise compared to conventional CCDs.
McErlean, Donal
core   +1 more source

Accelerated Discovery of Topological Spin Phase Diagrams in CrSBr Magnets Via High‐Throughput Optimization

Advanced Functional Materials, EarlyView.
Here, we develop a high‐throughput algorithm that accelerates the elucidation of phase diagrams of topological spin textures using limited computational resources at high numerical accuracy. Applying this framework to the van der Waals magnet CrSBr, we unveiled a hierarchy of previously unknown topological textures (domain‐wall bimerons, bimeron chains,
Andrew Lyall, Mohammad H. Badarneh, Cristian Bonato, Rebecca Cheung, Elton J. G. Santos   +4 more
wiley   +1 more source

Back-illuminated Light-spot-mapping Algorithm for Dual Rotation Robotic Fiber Positioners Based on an Artificial Probability Potential Field Method

The Astronomical Journal
Back-illuminated spot mapping is essential for observations with modern spectroscopic survey telescopes. In the fiber position detection system, after the fiber view camera (FVC) detects the positions of the light spots from the robotic fiber positioners
Yingfu Wang, Jiahao Zhou, Ziming Liu, Rongfeng Chen, Jiacheng Xie, Hongzhuan Hu, Jianping Wang, Zhigang Liu, Jiaru Chu, Feifan Zhang, Haotong Zhang, Yong Zhang, Zengxiang Zhou   +12 more
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