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arXiv 2108.03271astro-ph.GAastro-ph.COastro-ph.IM
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miniJPAS巡天:测光红移星表

The miniJPAS survey: the photometric redshift catalogue

A. Hernán-Caballero, J. Varela, C. López-Sanjuan, D. Muniesa, T. Civera, J. Chaves-Montero, L. A. Díaz-García, J. Laur, C. Hernández-Monteagudo, R. Abramo, R. A… 展开作者

A. Hernán-Caballero, J. Varela, C. López-Sanjuan, D. Muniesa, T. Civera, J. Chaves-Montero, L. A. Díaz-García, J. Laur, C. Hernández-Monteagudo, R. Abramo, R. Angulo, D. Cristóbal-Hornillos, R. M. González-Delgado, N. Greisel, A. Orsi, C. Queiroz, D. Sobral, A. Tamm, E. Tempel, H. Vázquez-Ramió, J. Alcaniz, N. Benítez, S. Bonoli, S. Carneiro, J. Cenarro, R. Dupke, A. Ederoclite, A. Marín-Frach, C. Mendes de Oliveira, M. Moles, L. Sodr, K. Taylor, E. S. Cypriano

摘要:

MiniJPAS是对AEGIS领域的60个波段进行的~1 deg^2成像调查,用于展示即将到来的JPAS调查的科学潜力。利用54个窄滤光片和6个宽滤光片对3800-9100 μ m范围的全覆盖,可以实现极其精确的光z,其应用范围超过1000 s deg^2,这将使光z技术的新应用成为可能,例如测量重子声学振荡。在本文中,我们描述了用于获得包含在公开的miniJPAS目录中的photo-z的方法,并验证了photo-z的性能。我们建立了100纳米分辨率的光谱从PSF校正的强制光圈测光。测光中的系统偏移是通过应用星等偏移来校正的,星等偏移是通过与恒星星族合成模型的迭代拟合获得的。我们使用定制版本的LePhare计算photo-z,使用一组针对J-PAS滤波器集优化的模板。我们分析了miniJPAS photo-z的准确性及其对多个量的依赖性,使用了5,266个星系的子样本,这些星系具有来自SDSS和DEEP的光谱红移,我们发现它们代表了整个r<23 miniJPAS样本。用δχ^2方法计算的photo-z的形式不确定性低估了实际的红移误差。几率参数与|Dz|有更强的相关性,并且准确地再现了红移异常值(|Dz| >0.03)的概率,而与源的星等、红移或光谱类型无关。我们表明,两个主要的概括统计特征的光z精度的星系人口(snmad和η)可以预测的几率分布在这样的人口,并使用它来估计他们的整个miniJPAS样本。在r<23时,有17,500个星系/deg^2具有有效的photo-z估算值,其中4,200个星系的|Dz| <0.003(略)。

英文摘要:

MiniJPAS is a ~1 deg^2 imaging survey of the AEGIS field in 60 bands, performed to demonstrate the scientific potential of the upcoming JPAS survey. Full coverage of the 3800-9100 Årange with 54 narrow and 6 broad optical filters allow for extremely accurate photo-z, which applied over 1000s of deg^2 will enable new applications of the photo-z technique such as measurement of baryonic acoustic oscillations. In this paper we describe the method used to obtain the photo-z included in the publicly available miniJPAS catalogue, and characterise the photo-z performance. We build 100 Åresolution photo-spectra from the PSF-corrected forced-aperture photometry. Systematic offsets in the photometry are corrected by applying magnitude shifts obtained through iterative fitting with stellar population synthesis models. We compute photo-z with a customised version of LePhare, using a set of templates optimised for the J-PAS filter-set. We analyse the accuracy of miniJPAS photo-z and their dependence on multiple quantities using a subsample of 5,266 galaxies with spectroscopic redshifts from SDSS and DEEP, that we find to be representative of the whole r<23 miniJPAS sample. Formal uncertainties for the photo-z that are calculated with the δχ^2 method underestimate the actual redshift errors. The odds parameter has the stronger correlation with |Dz|, and accurately reproduces the probability of a redshift outlier (|Dz|>0.03) irrespective of the magnitude, redshift, or spectral type of the sources. We show that the two main summary statistics characterising the photo-z accuracy for a population of galaxies (snmad and η) can be predicted by the distribution of odds in such population, and use this to estimate them for the whole miniJPAS sample. At r<23 there are 17,500 galaxies/deg^2 with valid photo-z estimates, of which 4,200 are expected to have |Dz|<0.003 (abridged).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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