Calibration of millimeter-wavelength spectral lines - Effect of harmonic mixer response

Details Calibration of millimeter-wavelength spectral lines - Effect of harmonic mixer response Calibration of millimeter-wavelength spectral lines - Effect of harmonic mixer response

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...295..139v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 295, Aug. 1, 1985, p. 139-142.

Astronomy and Astrophysics

Astronomy

2

Calibrating, Line Spectra, Millimeter Waves, Radio Sources (Astronomy), Radio Spectra, Frequency Response, Harmonic Oscillators, Radio Astronomy, Schottky Diodes, Sidebands

Scientific paper

The cooled Schottky-diode receivers used to observe millimeter-wavelength spectral lines exhibit harmonic response, that is, response in sidebands associated with harmonics of the local oscillator frequency. Ignoring this response leads to a systematic error if the line intensities are calibrated by observing braod-band noise sources. The inferred line intensities are all lower than the true values. Experimental data confirm the relevance of the effect for astronomical observations. Although the error is not large, careful observers should be aware of it for projects that require exceptionally well-calibrated data.

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