Results 51 to 60 of about 140,683 (272)

A Hierarchical Point-spread Function Reconstruction Method

The Astrophysical Journal
Reconstruction of the point-spread function (PSF) plays an important role in many areas of astronomy, including photometry, astrometry, galaxy morphology, and shear measurement.
Pedro Alonso, Jun Zhang, Cong Liu
doaj   +1 more source

Primary beam calibration for commensal telescopes utilizing offset optics

Frontiers in Astronomy and Space Sciences
IntroductionAccurate primary beam calibration is essential for precise brightness measurements in radio astronomy. The VLA Low-band Ionosphere and Transient Experiment (VLITE) faces challenges in calibration due to the offset Cassegrain optics used in ...
Emil Polisensky, Tracy E. Clarke, Simona Giacintucci, Wendy Peters   +3 more
doaj   +1 more source

Summary of the 13th IACHEC Meeting [PDF]

, 2019
We summarize the outcome of the 13th meeting of the International Astronomical Consortium for High Energy Calibration (IACHEC), held at Tenuta dei Ciclamini (Avigliano Umbro, Italy) in April 2018. Fifty-one scientists directly involved in the calibration
Belanger, G., Grant, C. E., Guainazzi, M., Kashyap, V., Madsen, K. K., Marshall, H. L., Miller, E. D., Natalucci, L., Nevalainen, J., Plucinsky, P. P., Terada, Y.   +10 more
core   +1 more source

Data mining techniques on astronomical spectra data – I. Clustering analysis

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Clustering is an effective tool for astronomical spectral analysis, to mine clustering patterns among data. With the implementation of large sky surveys, many clustering methods have been applied to tackle spectroscopic and photometric data effectively and automatically.
Haifeng Yang, Chenhui Shi, Jianghui Cai, Lichan Zhou, Yuqing Yang, Xujun Zhao, Yanting He, Jing Hao   +7 more
openaire   +2 more sources

Spectrally Tunable 2D Material‐Based Infrared Photodetectors for Intelligent Optoelectronics

Advanced Functional Materials, EarlyView.
Intelligent optoelectronics through spectral engineering of 2D material‐based infrared photodetectors. Abstract The evolution of intelligent optoelectronic systems is driven by artificial intelligence (AI). However, their practical realization hinges on the ability to dynamically capture and process optical signals across a broad infrared (IR) spectrum.
Junheon Ha, Yingshan Ma, Yong Nam An, Sung‐Un An, Hyeon Hak Jung, Suvi‐Tuuli Varjamo, Jiwon Yoo, Junho Min, Hanvit Kim, Faisal Ahmed, Sang Hoon Chae, Young Min Song, Weiwei Cai, Tawfique Hasan, Zhipei Sun, Dong‐Ho Kang, Hyeon‐Jin Shin, Yunyun Dai, Hoon Hahn Yoon   +18 more
wiley   +1 more source

The Digitization of Photographic Spectra in the Dominion Astrophysical Observatory Plate Collection with Commercial Scanners: A Pilot Study

The Astronomical Journal
Commercial flatbed scanners have the potential to deliver a quick and efficient means of capturing the scientific content of spectra recorded on photographic plates.
T. J. Davidge
doaj   +1 more source

Integrated Laboratory Demonstrations of Multi-Object Adaptive Optics on a Simulated 10-Meter Telescope at Visible Wavelengths [PDF]

, 2009
One important frontier for astronomical adaptive optics (AO) involves methods such as Multi-Object AO and Multi-Conjugate AO that have the potential to give a significantly larger field of view than conventional AO techniques.
Ammons, S. Mark, Bauman, Brian J., Gavel, Donald T., Johnson, Luke, Kupke, Renate, Laag, Edward A., Max, Claire E.   +6 more
core   +1 more source

Multipurpose Transparent Nanocomposites for Gamma Spectroscopy, Pulse Shape Discrimination, Thermal Neutron Detection, Radiation Shielding, and High Refractive Index Applications

Advanced Functional Materials, EarlyView.
Materials exist that are useful for gamma scintillation, radiation shielding, neutron‐gamma pulse shape discrimination (PSD), thermal neutron detection, or high refractive index applications. While certain materials have exhibited optimal performance for each of these applications, none achieve multiple functions.
Isabelle Winardi, Stephane Miaule, Robert Carmichael, Bowen Sun, Ziqing Han, Prabhav Surabhi, Zhen Luo, Noelan Hum, David Prout, Yi‐An Chen, Ting‐Hsuan Wu, Hao Yu, Arion Chatziioannou, Qibing Pei   +13 more
wiley   +1 more source

Projected Rotational Velocities for LAMOST Stars with Effective Temperatures Lower than 9000 K

The Astrophysical Journal Supplement Series
In Data Release 9 of LAMOST, we present measurements of v sin i for a total of 121,698 stars measured using the Medium Resolution Spectrograph (MRS) and 80,108 stars using the Low Resolution Spectrograph (LRS).
Fang Zuo, A-Li Luo, Bing Du, Yinbi Li, Hugh R. A. Jones, Yi-han Song, Xiao Kong, Yan-xin Guo   +7 more
doaj   +1 more source

Singular spectrum analysis for the time-variable seasonal signals from GPS in Yunnan Province

Geodesy and Geodynamics
Studying the seasonal deformation in GPS time series is important to interpreting geophysical contributors and identifying unmodeled and mismodeled seasonal signals.
Weijie Tan, Junping Chen, Yize Zhang, Bin Wang, Songyun Wang   +4 more
doaj   +1 more source