PreprintCC BY-NC-SA 4.0arXiv
Gnuastro: removing extended/diffuse outliers while coadding
Abstract
Deep astronomical images are produced by the coadding (also called "stacking") of several individual exposures. However, individual exposures are often plagued with many artifacts which will reduce the quality of the deep image if not properly removed. Most are removed during reduction/calibration, but the more diffuse may stay. To address this problem, the following new operators were introduced to the Arithmetic program in Gnuastro 0.23: 'madclip-maskfilled', 'sigclip-maskfilled' and 'collapse-*clip-fill-*'. They are able to mask many such outliers successfully by using all the exposures to find outlying pixels in each exposure and exploiting their contiguity. This research note is reproducible with Maneage, on the Git commit bf3815a.
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BibTeX
@misc{akhlaghi2026gnuastro,
title = {{Gnuastro: removing extended/diffuse outliers while coadding}},
author = {Mohammad Akhlaghi and Héctor Vives Arias and Pablo Renard and Héctor Vázquez Ramió and Raúl Infante-Sainz},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.15529},
eprint = {2609.15529},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15529},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Gnuastro: removing extended/diffuse outliers while coadding
AU - Mohammad Akhlaghi
AU - Héctor Vives Arias
AU - Pablo Renard
AU - Héctor Vázquez Ramió
AU - Raúl Infante-Sainz
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.15529
UR - https://arxiv.org/abs/2609.15529
AB - Deep astronomical images are produced by the coadding (also called "stacking") of several individual exposures. However, individual exposures are often plagued with many artifacts which will reduce the quality of the deep image if not properly removed. Most are removed during reduction/calibration, but the more diffuse may stay. To address this problem, the following new operators were introduced to the Arithmetic program in Gnuastro 0.23: 'madclip-maskfilled', 'sigclip-maskfilled' and 'collapse-*clip-fill-*'. They are able to mask many such outliers successfully by using all the exposures to find outlying pixels in each exposure and exploiting their contiguity. This research note is reproducible with Maneage, on the Git commit bf3815a.
ER -