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Optical Design of a Near-infrared Spectrograph Prototype for LAMOST

  • Authors: Xiaojie Zhang, Yonghui Hou, Jun Li, Haoran Yu, Hangxin Ji

Xiaojie Zhang et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 3.

2MASS Point Source Catalog source counts (per 0.2 mag bin) for several hundred square degrees near the north Galactic pole. Blue, green, and red histograms represent J (1.25 μm), H (1.65 μm), and Ks (2.16 μm) counts, respectively (M. F. Skrutskie et al. 2006).

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