ODIN：利用 DESI 对 Ly$\alpha$-发射星系样本进行光谱验证
星系天体物理
2026-03-11 v1
摘要
One-hundred-deg^2 DECam Imaging in Narrowbands(ODIN)调查正在对等方位与南方天空进行最宽域深窄带成像。ODIN 使用三个自行构建的窄带(NB)滤镜，对 z=2.4、3.1 和 4.5 处的 Ly 发射星系(LAE)进行薄宇宙片切片取样。在本工作中，我们利用 ODIN 选中星系在 COSMOS 和 XMM-LSS 场的广泛 DESI 光谱仪器，以验证 LAE 选择。2-4 小时的曝露与 DESI 获得了 3075 个 ODIN LAE 候选对象的红移确认，其 NB 亮度为 26~mag 以下。限于获得高置信度红移的星系，其确认率分别为 (93, 96, 92)%，对应 z=(2.4, 3.1, 4.5)。主要污染物由位于预期 Ly 红移范围内的活跃星系核(A)以及较低红移 (C IV, C III]) 组成，其余为星形成星系([O II] 和 [O III])。我们发现 [O II] 发射星系在样本中的污染极少 (<~1%)，这表明我们的 REW>20 A 窄带光度过度要求足以去除它们。
引用
@article{arxiv.2603.09905,
title = {ODIN: Spectroscopic Validation of Ly$\alpha$-Emitting Galaxy Samples with DESI},
author = {Ethan Pinarski and Govind Ramgopal and Nicole Firestone and Kyoung-Soo Lee and Eric Gawiser and Arjun Dey and A. Raichoor and Francisco Valdes and Robin Ciardullo and Jessica N. Aguilar and S. Ahlen and D. Bianchi and D. Brooks and F. J. Castander and M. Candela Cerdosino and T. Claybaugh and A. Cuceu and K. S. Dawson and A. de la Macorra and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and Lucia Guaita and G. Gutierrez and Stephen Gwyn and H. K. Herrera-Alcantar and Ho Seong Hwang and R. Joyce and S. Juneau and R. Kehoe and D. Kirkby and T. Kisner and A. Kremin and Ankit Kumar and C. Lamman and M. Landriau and L. Le Guillou and M. E. Levi and Yufeng Luo and M. Manera and P. Martini and A. Meisner and R. Miquel and J. Moustakas and A. D. Myers and S. Nadathur and Gautam R. Nagaraj and N. Palanque-Delabrouille and Changbom Park and W. J. Percival and I. Pérez-Ràfols and F. Prada and G. Rossi and E. Sanchez and Marcin Sawicki and D. Schlegel and M. Schubnell and J. Silber and Hyunmi Song and D. Sprayberry and G. Tarlé and Paulina Troncoso Iribarren and B. A. Weaver and Yujin Yang and Ann Zabludoff},
journal= {arXiv preprint arXiv:2603.09905},
year = {2026}
}
备注
15 pages, 6 figures, Submitted to Astrophysical Journal