DESI调查验证：视觉检查明亮星系，发光红色星系和发射线星系的结果

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DESI调查验证：视觉检查明亮星系，发光红色星系和发射线星系的结果

The DESI Survey Validation: Results from Visual Inspection of Bright Galaxies, Luminous Red Galaxies, and Emission Line Galaxies

论文作者

Lan, Ting-Wen, Tojeiro, R., Armengaud, E., Prochaska, J. Xavier, Davis, T. M., Alexander, David M., Raichoor, A., Zhou, Rongpu, Yeche, Christophe, Balland, C., BenZvi, S., Berti, A., Canning, R., Carr, A., Chittenden, H., Cole, S., Cousinou, M. -C., Dawson, K., Dey, Biprateep, Douglass, K., Edge, A., Escoffier, S., Glanville, A., Gontcho, S. Gontcho A, Guy, J., Hahn, C., Howlett, C., Hwang, Ho Seong, Jiang, L., Kovacs, A., Mezcua, M., Moore, S., Nadathur, S., Oh, M., Parkinson, D., Rocher, A., Ross, A. J., Ruhlmann-Kleider, V., Sabiu, C. G., Said, K., Saulder, C., Sierra-Porta, D., Weiner, B., Yu, J., Zarrouk, P., Zhang, Y., Zou, H., Ahlen, S., Bailey, S., Brooks, D., Cooper, A. P., de la Macorra, A., Dey, A., Dhungana, G., Doel, P., Eftekharzadeh, S., Fanning, K., Font-Ribera, A., Garrison, L., Gaztanaga, E., Kehoe, R., Kisner, T., Kremin, A., Landriau, M., Guillou, L. Le, Levi, Michael E., Magneville, C., Meisner, Aaron M., Miquel, R., Moustakas, J., Myers, Adam D., Newman, Jeffrey A., Nie, J. D., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Schubnell, M., Tarle, Gregory, Weaver, B. A., Zhang, K., Zhou, Zhimin

论文摘要

暗能量光谱仪器（DESI）调查已获得一组星系的光谱测量，以验证最终的调查设计和目标选择。为了协助这些任务，我们可以视觉检查（VI）DESI光谱，约有2500个明亮的星系，3,500个发光红色星系（LRGS）和10,000个发射线星系（ELGS），以获得可靠的红移识别。然后，我们利用VI红移信息来表征DESI操作的性能。根据VI目录，我们的结果表明，最终的调查设计产生了纯度大于$ 99 \％$的明亮星系，LRG和ELG的样品。此外，我们证明，对于明亮的星系和EL，红移测量的精度约为10 km/s，对于LRGS，红移测量值约为40 km/s。对于三种类型的星系，平均红移精度在10 km/s之内。 VI过程还通过识别管道引入的虚假光谱特征来帮助提高DESI数据的质量。最后，我们展示了由VI确定的意外真实天文对象的例子，例如Ly $α$发射器和强烈的镜头候选。这些结果表明，从传入和即将进行的调查中，尤其是在其早期操作阶段中检查数据的重要性和效用。

The Dark Energy Spectroscopic Instrument (DESI) Survey has obtained a set of spectroscopic measurements of galaxies to validate the final survey design and target selections. To assist in these tasks, we visually inspect (VI) DESI spectra of approximately 2,500 bright galaxies, 3,500 luminous red galaxies (LRGs), and 10,000 emission line galaxies (ELGs), to obtain robust redshift identifications. We then utilize the VI redshift information to characterize the performance of the DESI operation. Based on the VI catalogs, our results show that the final survey design yields samples of bright galaxies, LRGs, and ELGs with purity greater than $99\%$. Moreover, we demonstrate that the precision of the redshift measurements is approximately 10 km/s for bright galaxies and ELGs and approximately 40 km/s for LRGs. The average redshift accuracy is within 10 km/s for the three types of galaxies. The VI process also helps improve the quality of the DESI data by identifying spurious spectral features introduced by the pipeline. Finally, we show examples of unexpected real astronomical objects, such as Ly$α$ emitters and strong lensing candidates, identified by VI. These results demonstrate the importance and utility of visually inspecting data from incoming and upcoming surveys, especially during their early operation phases.

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