Results 1 to 10 of about 27,118,143 (254)

Reduction and Archiving of Multiwavelength, Polarized-intensity Debris-disk Observations with the Gemini Planet Imager

open access: yesThe Astrophysical Journal Supplement Series
The Gemini Planet Imager (GPI), an extreme adaptive optics instrument on Gemini South, has been pivotal in the advancement of the debris-disk field.
Katie A. Crotts   +12 more
doaj   +1 more source

An Algorithm Architecture for Radio Interferometric Data Processing

open access: yesThe Astronomical Journal
We present a foundational, scalable algorithm architecture for processing data from aperture synthesis radio telescopes. The analysis leading to the architecture is rooted in the theory of aperture synthesis, signal processing, and numerical optimization,
S. Bhatnagar   +4 more
doaj   +1 more source

Cosmic-CoNN: A Cosmic-Ray Detection Deep-learning Framework, Data Set, and Toolkit

open access: yesThe Astrophysical Journal, 2023
Rejecting cosmic rays (CRs) is essential for the scientific interpretation of CCD-captured data, but detecting CRs in single-exposure images has remained challenging.
Chengyuan Xu   +4 more
doaj   +1 more source

The Early Data Release of the Dark Energy Spectroscopic Instrument

open access: yesThe Astronomical Journal
The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the
DESI Collaboration   +269 more
doaj   +1 more source

Quasar Properties from the Sloan Digital Sky Survey. III. The Quasars Obtained by the SDSS-IV

open access: yesThe Astrophysical Journal Supplement Series, 2023
This paper provides the compilations of properties of the quasars newly obtained by the Sloan Digital Sky Survey (SDSS) during the fourth stage (SDSS-IV). The catalog is available on the journal's website. We have measured the main properties of emission
Wei-Rong Huang   +3 more
doaj   +1 more source

The EDGES Analysis Pipeline: Description and Validation

open access: yesThe Astrophysical Journal
The sky-averaged redshifted 21 cm signal from Cosmic Dawn is expected to provide a unique view of the first compact objects. However, its measurement remains daunting.
Steven G. Murray   +9 more
doaj   +1 more source

Data Release 1 of the Dark Energy Spectroscopic Instrument

open access: yesThe Astronomical Journal
In 2021 May the Dark Energy Spectroscopic Instrument (DESI) collaboration began a 5 yr spectroscopic redshift survey to produce a detailed map of the evolving three-dimensional structure of the Universe between z = 0 and z  ≈ 4.
DESI Collaboration   +309 more
doaj   +1 more source

Square Root Compression and Noise Effects in Digitally Transformed Images

open access: yesThe Astrophysical Journal, 2022
We report on a particular example of noise and data representation interacting to introduce systematic error into scientific measurements. Many instruments collect integer digitized values and apply nonlinear coding, in particular square root coding, to ...
Craig E. DeForest   +3 more
doaj   +1 more source

Efficient Astronomical Data Condensation Using Approximate Nearest Neighbors

open access: yesInternational Journal of Applied Mathematics and Computer Science, 2019
Extracting useful information from astronomical observations represents one of the most challenging tasks of data exploration. This is largely due to the volume of the data acquired using advanced observational tools.
Łukasik Szymon   +5 more
doaj   +1 more source

SAX and Random Projection Algorithms for the Motif Discovery of Orbital Asteroid Resonance Using Big Data Platforms

open access: yesSensors, 2022
The phenomenon of big data has occurred in many fields of knowledge, one of which is astronomy. One example of a large dataset in astronomy is that of numerically integrated time series asteroid orbital elements from a time span of millions to billions ...
Lala Septem Riza   +5 more
doaj   +1 more source

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