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Information for Observers on NIKA2 Bandpasses

Bandpasses of the NIKA2 Arrays

after 3/2025

In March 2025, NIKA2 was upgraded. New 1mm KID arrays were installed, the dichroic was exchanged, various filters have been exchanged. New measurements of the in-situ bandpasses were conducted with the Martin-Puplett interferometer "PIMP" and, as of 18/6/2025, a report on the new bandpasses is in preparation.

till 3/2025

For convenience, we provide one ASCII file with the three NIKA2 bandpasses and three atmospheric transmission curves for 2mm, 4mm, and 7mm of precipitable water vapour: nika2-bandpasses-atm.dat. The instrumental bandpasses have already been corrected for the Rayleigh-Jeans source emission. They are shown in the figure below and also in Figure 1 of Perotto et al. (2020). These bandpasses were measured in the laboratory in Grenoble.

Atmospheric transmission curves

The ATM model of J.Pardo & P.Cernicharo was used to calculate the atmospheric transmission at Pico Veleta. See also the figure below.

Figures

nika2-bandpasses3.png atmos-transmission9.png

Old information

The spectral bands as measured in Néel (note that the two 1.15mm arrays are pretty similar but there is a detectable difference):

xavier_v1.jpg

xavier_v2.jpg

SpectralBands (last edited 2025-07-07 16:08:43 by CarstenKramer)