Results 41 to 50 of about 443 (134)

Robust Estimates of Orientation between Astrometric Catalogs

The Astronomical Journal, 2023
Accurately comparing two celestial reference frames based on the observed position of a number of common objects requires to detect and appropriately process outliers, lest they spuriously influence the results.
Julien Frouard
doaj   +1 more source

Maximum-likelihood Regression with Systematic Errors for Astronomy and the Physical Sciences. II. Hypothesis Testing of Nested Model Components for Poisson Data

The Astrophysical Journal
A novel model of systematic errors for the regression of Poisson data is applied to hypothesis testing of nested model components with the introduction of a generalization of the Δ C statistic that applies in the presence of systematic errors. This paper
Massimiliano Bonamente, Dale Zimmerman, Yang Chen   +2 more
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The Role of Statistics and Statisticians in the Future of Astrostatistics [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractGiven the generic definition of statistics, it is clear that astronomers have engaged in statistical analysis of some variety since astronomy first emerged as a science. However, from the early nineteenth century until the beginning of the twenty-first the two disciplines have been somewhat estranged – there was no formal relationship between ...
openaire   +1 more source

Photometric Redshift Estimation of Quasars by a Cross-modal Contrast Learning Method

The Astronomical Journal
Estimating photometric redshifts (photo- z ) of quasars is crucial for measuring cosmic distances and monitoring cosmic evolution. While numerous point estimation methods have successfully determined photo- z , they often struggle with the inherently ill-
Chen Zhang, Wenyu Wang, Meixia Qu, Bin Jiang, YanXia Zhang   +4 more
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Jupyter notebooks from Gaussian process and transit fitting hands-on sessions

, 2022
Jupyter notebooks, and auxiliary data, from two "hands-on" sessions at the Exoplanets Astrostatistics Summer School (12-16 Sept. 2022 in Geneva). Notebooks used in these sessions had several blocks of Python code missing, to be filled out by session ...
Vinesh Maguire Rajpaul
core   +1 more source

Multifidelity Emulator for Large-scale 21 cm Lightcone Images: A Few-shot Transfer Learning Approach with Generative Adversarial Network

The Astrophysical Journal
Emulators using machine learning techniques have emerged to efficiently generate mock data matching the large survey volume for upcoming experiments, as an alternative approach to large-scale numerical simulations.
Kangning Diao, Yi Mao
doaj   +1 more source

A Geometric Approach to Estimate Background in Astronomical Images

The Astrophysical Journal Supplement Series
Estimating the true background in an astronomical image is fundamental to detecting faint sources. In a typical low-photon-count astronomical image, such as in the far- and near-ultraviolet wavelength ranges, conventional methods relying on 3 σ clipping ...
Pushpak Pandey, Kanak Saha
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An Information-based Metric for Observing Strategy Optimization, Demonstrated in the Context of Photometric Redshifts for LSST

The Astrophysical Journal Supplement Series
The observing strategy (OS) of an astronomical survey influences the degree to which its resulting data can be used to accomplish any science goal, necessitating upcoming programs, including those on the Rubin and Roman telescopes, to solicit metrics in ...
Alex I. Malz, Francois Lanusse, John Franklin Crenshaw, Bryan Scott, Melissa L. Graham   +4 more
doaj   +1 more source

A Preliminary Study of Large Scale Pulsar Candidate Sifting Based on Parallel Hybrid Clustering

, 2022
Pulsar candidate sifting is an essential part of pulsar analysis pipelines for discovering new pulsars. To solve the problem of data mining of a large number of pulsar data using a Five-hundred-meter Aperture Spherical radio Telescope (FAST), a parallel ...
Ru-Shuang Zhao, Si-Yao Li, Pei Wang, Zhi Ma, Zi-Yi You, Ying Liu, Ai-Jun Dong, Dan-Dan Zhang, Shi-Jun Dang   +8 more
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Computational AstroStatistics: Fast and Efficient Tools for Analysing Huge Astronomical Data Sources [PDF]

, 2006
Invited talk at "Statistical Challenges in Modern Astronomy III" July 18-21 2001.
Nichol, R. C., Chong, S., Connolly, A. J., Davies, S., Genovese, C., Hopkins, A. M., Miller, C. J., Moore, A. W., Pelleg, D., Richards, G. T., Schneider, J., Szapudi, I., Wasserman, L.   +12 more
openaire   +2 more sources