The NIKA2 large-field-of-view millimetre continuum camera for the 30 m IRAM telescope

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Volume 609 (January 2018)

A&A, 609 (2018) A115

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Table 1

Summary of the principle characteristics and performance of the NIKA2 instrument.

Channel	260 GHz			150 GHz
	1.15 mm			2 mm

Arrays	A1	A3	A1&3	A2

Number of designed detectors	1140	1140		616
Number of valid detectors¹	952	961		553
Number of used detectors²	660–830	725–780		430–480

FoV diameter [arcmin]	6.5	6.5	6.5	6.5
FWHM [arcsec]	11.3 ± 0.2	11.2 ± 0.2	11.2 ± 0.1	17.7 ± 0.1
Beam efficiency³ [%]	55 ± 5	53 ± 5	60 ± 6	75 ± 5

rms calibration error [%]	4.5	6.6		5

Model absolute calibration uncertainty [%]	5

RMS pointing error [arcsec]	<3

NEFD [mJy s^1/2] ⁴			33 ± 2	8 ± 1
Mapping speed [arcmin² h^-1 mJy^-2] ⁵			67–78	1288–1440

Notes.

⁽¹⁾

Number of detectors that are valid at least for two different beam map scans.

⁽²⁾

Number of detectors used in the scientific analysis after stringent selection.

⁽³⁾

Ratio between the main beam power and the total beam power up to a radius of 250′′.

⁽⁴⁾

Average NEFD during the February, 2017 observation campaign, extrapolated at τ = 0.

⁽⁵⁾

Average mapping speed during the February, 2017 observation campaign, extrapolated at τ = 0.

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