Performance and calibration of the NIKA camera at the IRAM 30 m telescope

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Table 2

Different contributions to the total calibration error of the NIKA data.

Systematics	1.25 mm Channel error	2.14 mm Channel error

Secondary beams fraction^* (cuts at 30′′, 60′′, 90′′)	25%, 41%, 43%	9%, 30%, 33%
Primary calibrator	5%	5%
Elevation dependant gain correction^**	20%	10%
Spectral response	2%	1%
FOV reconstruction	3.4 arcsec	3.2 arcsec
Opacity correction	5%	6.5%
Data reduction filtering (on point sources)	5%	5%

Overall calibration	15%	10%

Notes.

^(*)

Is estimated by measuring the main beam volume (2πσ²) over the integral of the beam volume up to a considered angular radius.

^(**)

Typically for 1.25 mm the gain correction is about 8% at an elevation of 30 deg (3% at 2.14 mm).

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