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On-The-Fly Mapping at AO: Sensitivity and Baseline Quality. K. Spekkens, C. M. Springob, R. Giovanelli, M. P. Haynes, K. L. Masters; Cornell. - Map 3 fields in 4 ways:. DRIFT MODE: 12s/beam “SLOW” OTF: 6s/beam “FAST” OTF, RA-Dec: 3s/beam “FAST” OTF, Dec-RA: 3s/beam.

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On-The-Fly Mapping at AO:

Sensitivity and Baseline Quality

K. Spekkens, C. M. Springob, R. Giovanelli, M. P. Haynes, K. L. Masters; Cornell

- Map 3 fields in 4 ways:

  • DRIFT MODE: 12s/beam

  • “SLOW” OTF: 6s/beam

  • “FAST” OTF, RA-Dec: 3s/beam

  • “FAST” OTF, Dec-RA: 3s/beam

- Setup and preliminary analysis:

  • L-narrow, 1385-1425 MHz coverage (4x12.5 MHz BPs, 12 kHz ch.)

  • 1s integrations across ~5 min strips; Nyquist sampled beam

  • Bandpass correction: divide each record by strip average


Sensitivity Across a Strip – Drift vs. “Slow” OTF

DRIFT

“SLOW” OTF

1s integrations

1415 – 1419 MHz

1421 – 1425 MHz

1405 – 1415 MHz

1s int. + Hanning

smooth in freq.


Sensitivity Across a Strip – “Fast” OTF

Dec-RA

RA-Dec

1s integrations

1415 – 1419 MHz

1421 – 1425 MHz

1405 – 1415 MHz

1s int. + Hanning

smooth in freq.


Intensity (x Tsys)

Baseline Quality – “Fast” OTF Dec-RA Map

Raw spectrum:

1s integration

3s average:

rms/beam

3s average +

Hanning smooth


Baseline Quality – Power Spectrum

High freq.

Low freq.

Raw spectrum:

1s integration

3s average:

rms/beam

3s average +

Hanning smooth


High freq.

Low freq.

Baseline Quality – Average Power

Raw spectrum:

1s integration

3s average:

rms/beam

3s average +

Hanning smooth


OTF Mapping: Sensitivity and Baseline Quality

For all methods (Drift, “slow” OTF , “fast” OTF):

  • Theoretical sensitivity limit achieved; no trend in RMS across strip

  • “Flat” baselines: no harmonics in power spectrum

Map sensitivity and baseline quality independent of mapping technique


Baseline Quality – “Fast” OTF RA-Dec Map

Raw spectrum:

1s integration

3s average:

rms/beam

Intensity (x Tsys)

3s average +

Hanning smooth


Baseline Quality – Power Spectrum

High freq.

Low freq.

Raw spectrum:

1s integration

3s average:

rms/beam

3s average +

Hanning smooth


Baseline Quality – Average Power

High freq.

Low freq.

Raw spectrum:

1s integration

3s average:

rms/beam

3s average +

Hanning smooth


Baseline Quality – “Slow” OTF Map

Raw spectrum:

1s integration

6s average:

rms/beam

Intensity (x Tsys)

6s average +

Hanning smooth


Baseline Quality – Power Spectrum

High freq.

Low freq.

Raw spectrum:

1s integration

6s average:

rms/beam

6s average +

Hanning smooth


Baseline Quality – Average Power

High freq.

Low freq.

Raw spectrum:

1s integration

6s average:

rms/beam

6s average +

Hanning smooth


Baseline Quality – Drift Map

Raw spectrum:

1s integration

12s average:

rms/beam

Intensity (x Tsys)

12s average +

Hanning smooth


Baseline Quality – Power Spectrum

High freq.

Low freq.

Raw spectrum:

1s integration

12s average:

rms/beam

12s average +

Hanning smooth


Baseline Quality – Average Power

High freq.

Low freq.

Raw spectrum:

1s integration

12s average:

rms/beam

12s average +

Hanning smooth



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