农民:用于深星系调查的可重复的剖面拟合光度计包

IF 8.6 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
J. R. Weaver, L. Zalesky, V. Kokorev, C. J. R. McPartland, N. Chartab, K. M. L. Gould, M. Shuntov, I. Davidzon, A. Faisst, N. Stickley, P. L. Capak, S. Toft, D. Masters, B. Mobasher, D. B. Sanders, O. B. Kauffmann, H. J. McCracken, O. Ilbert, G. Brammer, A. Moneti
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引用次数: 0

摘要

虽然星载光学和近红外设备已经成功地提供了我们宇宙的精确和空间分辨率的图像,但它们的小调查区域被认为不足以代表星系群的真正多样性。地面调查已经达到了类似的深度,但空间分辨率较低,导致源混淆,阻碍了准确的光度提取。曾经仅限于红外波段的探测,现在已经开始挑战地面的超深探测,对探测和光度测量都产生了影响。如果不能解决这些挑战,就意味着失去对遥远宇宙的代表性看法。我们介绍了The Farmer:一个自动化的,可重复的轮廓拟合光度测量包,它将来自The Tractor的平滑参数模型库与决策树配对,该决策树可以确定与邻近源一致的最佳拟合模型。光度测量是通过在其他波段上拟合模型来测量的,让亮度自由变化。由此产生的光度测量自然是全的,不需要孔径校正。支持诊断(如χ 2)使测量验证成为可能。由于拟合模型相对耗时,The Farmer采用高性能计算例程构建。我们在一组真实的类似宇宙的图像上对农民进行基准测试,并找到准确的光度,数量计数和星系形状。Farmer已经被用于为几次大面积的深河外巡天制作目录,在这些巡天中,它已经被证明可以处理一些最具挑战性的光学和近红外数据,并有望在不久的将来扩展到其他超深巡天。农民可以从GitHub (https://github.com/astroweaver/the_farmer)和Zenodo (https://doi.org/10.5281/zenodo.8205817)下载。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Farmer: A Reproducible Profile-fitting Photometry Package for Deep Galaxy Surveys
Abstract While space-borne optical and near-infrared facilities have succeeded in delivering a precise and spatially resolved picture of our Universe, their small survey area is known to underrepresent the true diversity of galaxy populations. Ground-based surveys have reached comparable depths but at lower spatial resolution, resulting in source confusion that hampers accurate photometry extractions. What once was limited to the infrared regime has now begun to challenge ground-based ultradeep surveys, affecting detection and photometry alike. Failing to address these challenges will mean forfeiting a representative view into the distant Universe. We introduce The Farmer : an automated, reproducible profile-fitting photometry package that pairs a library of smooth parametric models from The Tractor with a decision tree that determines the best-fit model in concert with neighboring sources. Photometry is measured by fitting the models on other bands leaving brightness free to vary. The resulting photometric measurements are naturally total, and no aperture corrections are required. Supporting diagnostics (e.g., χ 2 ) enable measurement validation. As fitting models is relatively time intensive, The Farmer is built with high-performance computing routines. We benchmark The Farmer on a set of realistic COSMOS-like images and find accurate photometry, number counts, and galaxy shapes. The Farmer is already being utilized to produce catalogs for several large-area deep extragalactic surveys where it has been shown to tackle some of the most challenging optical and near-infrared data available, with the promise of extending to other ultradeep surveys expected in the near future. The Farmer is available to download from GitHub ( https://github.com/astroweaver/the_farmer ) and Zenodo ( https://doi.org/10.5281/zenodo.8205817 ).
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来源期刊
Astrophysical Journal Supplement Series
Astrophysical Journal Supplement Series 地学天文-天文与天体物理
CiteScore
14.50
自引率
5.70%
发文量
264
审稿时长
2 months
期刊介绍: The Astrophysical Journal Supplement (ApJS) serves as an open-access journal that publishes significant articles featuring extensive data or calculations in the field of astrophysics. It also facilitates Special Issues, presenting thematically related papers simultaneously in a single volume.
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