WAFTT results part 3

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Summary

In this posting we study the effects of different scan strategies in the presence of atmospheric effects on the forecasts of Neff.

Depth maps

Total depth 095GHz.png

Rows are minimum observing elevations of 30, 40 and 50 degrees.

Columns are no elevation penalty, with elevation penalty, and high cadence.

These depth maps are for 254 detectors (127 pairs) taking data for one year. The NETs assumed for the maps were for the SAT model. To correct, they are rescaled by the ratio of LAT/SAT NET at an elevation of 50 degrees. To arrive at the noise properties for the array, the noise levels obtained from these maps are rescaled by the number of detectors in the different frequency bands, taking into account a yield of 80% and correlation between detectors taken from here. To arrive at the noise properties for the seven year survey, they are scaled from a single year to seven years, assuming an efficiency of 23%, consistent with the assumptions that enter the noise calculator.

Noise characteristics for minimum elevation of 50 degrees

No elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 56.8 52.0 45.2 38.9
Effective sky fraction for noise (in %) 51.6 47.1 40.8 34.8
Effective sky fraction for signal (in %) 47.3 43.0 37.2 31.6


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 17.9 9.8 1.6 1.6 5.5 13.0
ell knee TT 415 391 1932 3917 6740 6792
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 25.2 13.8 2.3 2.2 7.8 18.5
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4

With elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 56.8 52.0 45.2 38.8
Effective sky fraction for noise (in %) 51.1 46.6 40.4 34.3
Effective sky fraction for signal (in %) 45.9 41.7 36.0 30.6


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 17.4 9.6 1.6 1.5 5.4 12.8
ell knee TT 415 391 1932 3917 6740 6792
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 24.8 13.5 2.3 2.2 7.6 18.1
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4

High cadence survey - 2 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 57.9 52.7 45.6 39.4
Effective sky fraction for noise (in %) 47.3 43.1 37.1 31.7
Effective sky fraction for signal (in %) 38.2 34.8 30.0 25.3


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 17.2 9.5 1.6 1.5 5.3 12.6
ell knee TT 415 391 1932 3917 6740 6792
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 24.3 13.4 2.3 2.2 7.4 17.8
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4

High cadence survey - 11 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 59.7 54.4 47.2 40.8
Effective sky fraction for noise (in %) 53.9 49.2 42.5 36.6
Effective sky fraction for signal (in %) 48.3 44.1 37.9 32.5


Frequency (GHz) 30 40 90 150 220 270
white noise level TT (uK-arcmin) 18.8 10.5 1.8 1.7 5.9 13.9
ell knee TT 415 391 1932 3917 6740 6792
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 26.4 14.8 2.4 2.3 8.2 19.7
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4

Noise characteristics for minimum elevation of 40 degrees

No elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 68.2 62.5 55.1 48.1
Effective sky fraction for noise (in %) 63.5 58.3 51.2 44.5
Effective sky fraction for signal (in %) 59.2 54.3 47.5 41.1


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 20.0 11.2 1.9 1.8 6.3 15.0
ell knee TT 440 406 2031 4117 7011 7029
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 28.3 15.9 2.7 2.5 8.8 21.3
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.01 1.03 1.02 1.02 1.03 1.03

With elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 68.2 62.6 55.2 4812
Effective sky fraction for noise (in %) 61.3 56.2 49.3 42.7
Effective sky fraction for signal (in %) 54.9 50.2 43.8 37.7


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 19.3 10.6 1.8 1.7 6.0 14.0
ell knee TT 440 406 2031 4117 7011 7029
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 27.3 14.9 2.6 2.3 8.4 19.8
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.00 1.01 1.01 1.01 1.01 1.01

High cadence survey - 2 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 67.6 61.4 53.9 46.8
Effective sky fraction for noise (in %) 58.6 53.3 46.4 39.4
Effective sky fraction for signal (in %) 50.0 45.5 39.4 33.8


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 19.5 11.1 1.9 1.8 6.2 15.0
ell knee TT 440 406 2031 4117 7011 7029
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 27.5 15.8 2.6 2.4 8.8 21.1
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.03 1.06 1.04 1.04 1.06 1.07

High cadence survey - 11 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 69.8 63.6 56.0 48.7
Effective sky fraction for noise (in %) 62.6 56.9 49.7 43.1
Effective sky fraction for signal (in %) 55.6 50.6 43.9 37.9


Frequency (GHz) 30 40 90 150 220 270
white noise level TT (uK-arcmin) 20.7 11.9 2.0 1.9 6.7 16.1
ell knee TT 440 406 2031 4117 7011 7029
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 29.4 16.8 2.9 2.6 9.4 22.7
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.03 1.06 1.05 1.04 1.06 1.07

Noise characteristics for minimum elevation of 30 degrees

No elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 75.8 69.3 61.6 53.9
Effective sky fraction for noise (in %) 70.9 64.8 57.3 50.1
Effective sky fraction for signal (in %) 66.2 60.6 53.3 46.5


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 21.8 12.4 2.0 2.0 6.9 16.7
ell knee TT 471 428 2154 4364 7334 7308
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 30.8 17.6 2.9 2.8 9.8 23.6
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.04 1.08 1.06 1.06 1.07 1.09

With elevation penalty

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 75.8 69.3 61.6 53.9
Effective sky fraction for noise (in %) 66.1 60.5 53.3 46.4
Effective sky fraction for signal (in %) 57.6 52.7 46.1 39.8


Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 20.2 11.0 1.9 1.8 6.2 14.7
ell knee TT 471 428 2154 4364 7334 7308
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 28.7 15.7 2.7 2.5 8.8 20.9
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.00 1.02 1.01 1.01 1.02 1.02

High cadence - 2 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 75.3 68.3 60.3 52.6
Effective sky fraction for noise (in %) 65.5 59.5 52.2 45.5
Effective sky fraction for signal (in %) 54.1 49.2 42.7 37.4
Frequency (GHz) 30 40 95 145 220 270
white noise level TT (uK-arcmin) 22.0 13.0 2.2 2.0 7.2 17.5
ell knee TT 471 428 2154 4364 7334 7308
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 31.2 18.4 3.0 2.8 10.2 24.8
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.08 1.17 1.13 1.12 1.15 1.18

High cadence - 11 elevations

Galactic cut (in %) 0 10 20 30
Sky fraction (in %) 77.8 70.7 62.6 54.7
Effective sky fraction for noise (in %) 67.0 60.9 53.5 46.6
Effective sky fraction for signal (in %) 57.4 52.3 45.7 39.6


Frequency (GHz) 30 40 90 150 220 270
white noise level TT (uK-arcmin) 22.7 13.6 2.2 2.1 7.5 18.5
ell knee TT 471 428 2154 4364 7334 7308
1/f exponent TT (uK-arcmin) -3.5 -3.5 -3.5 -3.5 -3.5 -3.5
white noise level E/B (uK-arcmin) 32.1 19.3 3.1 2.9 10.6 26.1
ell knee E/B 700 700 700 700 700 700
1/f exponent E/B (uK-arcmin) -1.4 -1.4 -1.4 -1.4 -1.4 -1.4
Penalty (relative to f_sky scaling) 1.08 1.17 1.14 1.12 1.16 1.19

Results

(Modified 6-7-2019 to update noise model - JM)

Neff WAFTT v3 hc11.png