Table 18.
Summary of the main characteristics describing NIKA2 measured performance.
Array 1 and 3 | Array 2 | Reference | ||
---|---|---|---|---|
Reference wavelength [mm] | 1.15 | 2.00 | ||
Reference frequency [GHz] | 260 | 150 | Sect. 8.1.1 | |
Frequency [GHz] | 254.7 and 257.4 | 150.9 | Sect. 2.5 | |
Bandwidth [GHz] | 49.2 and 48.0 | 40.7 | ||
Number of designed detectors | 1140 and 1140 | 616 | Sect. 2.3 | |
Number of valid detectors (a) | 952 and 961 | 553 | Sect. 5.3 | |
Fraction of valid detectors [%] | 84 | 90 | ||
Pixel size in beam sampling unit (b) [λ/D] | 1.1 | 0.87 | Sect. 5.2 | |
FWHM(c) [arcsec] | 11.1 ± 0.2 | 17.6 ± 0.1 | Sect. 6.2 | |
Main beam efficiency (d) [%] | 47 ± 3 | 64 ± 3 | Sect. 6.3 | |
rms FWHM across the FOV [arcsec] | 0.6 | 0.6 | Adam et al. (2018) | |
Reference FWHM (e) [arcsec] | 12.5 | 18.5 | Sect. 8.1.1 | |
Reference beam efficiency (f) [% ] | 61 ± 3 | 72 ± 2 | Sect. 8.1.3 | |
rms pointing error [arcsec] | < 3 | < 3 | Sect. 3.2 | |
Absolute calibration uncertainty [%] | 5 | 5 | Sect. 9.1, Appendix A.1 | |
Systematic calibration uncertainty (g) [%] | 0.6 | 0.3 | Sect. 9.1.3 | |
Point-source rms calibration uncertainty [%] | 5.7 | 3.0 | Sect. 9.2 | |
α noise integration in time (h) | 0.5 | 0.5 | Sect. 10.3 | |
NEFD (i) [mJy s1/2] | 30 ± 3 | 9 ± 1 | Sect. 10.3 | |
Ms(j) [arcmin2 mJy−2 h−1] | 111 ± 11 | 1388 ± 174 |
Notes.
Calculated from real array pixel size [2.75 mm/2.0 mm] and unvignetted entrance pupil diameter [27 m].
Ratio between the main beam and the total beam solid angles including large angular-scale error beams and far side lobes.
Ratio between the reference FWHM beam and the total beam solid angles including large angular-scale error beams and far side lobes.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.