Absolute calibration of millimeter-wavelength spectral lines
A detailed analysis of the chopper-wheel method of calibrating the intensity of a millimeter-wavelength spectral line is presented. Special techniques were used to construct a receiver which eliminates most of the usual calibration difficulties. The zenith atmospheric extinction between 3.5 mm and 2...
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| Veröffentlicht in: | Astrophys. J., Suppl. Ser.; (United States) Suppl. Ser.; (United States), 1976-03, Vol.30, p.247 |
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| container_title | Astrophys. J., Suppl. Ser.; (United States) |
| container_volume | 30 |
| creator | Ulich, B. L. Haas, R. W. |
| description | A detailed analysis of the chopper-wheel method of calibrating the intensity of a millimeter-wavelength spectral line is presented. Special techniques were used to construct a receiver which eliminates most of the usual calibration difficulties. The zenith atmospheric extinction between 3.5 mm and 2.6 mm wavelength was measured, and the intensities of six spectral lines in this range were absolutely calibrated with an estimated uncertainty (1 sigma) of 7 percent. The effects of the antenna power pattern on the corrected antenna temperature T*/sub A/ are calculated for several simple models of the source brightness distribution. (auth) |
| doi_str_mv | 10.1086/190361 |
| format | Article |
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W.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Astrophys. J., Suppl. Ser.; (United States)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ulich, B. L.</au><au>Haas, R. W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Absolute calibration of millimeter-wavelength spectral lines</atitle><jtitle>Astrophys. J., Suppl. Ser.; (United States)</jtitle><date>1976-03-01</date><risdate>1976</risdate><volume>30</volume><spage>247</spage><pages>247-</pages><issn>0067-0049</issn><eissn>1538-4365</eissn><abstract>A detailed analysis of the chopper-wheel method of calibrating the intensity of a millimeter-wavelength spectral line is presented. Special techniques were used to construct a receiver which eliminates most of the usual calibration difficulties. The zenith atmospheric extinction between 3.5 mm and 2.6 mm wavelength was measured, and the intensities of six spectral lines in this range were absolutely calibrated with an estimated uncertainty (1 sigma) of 7 percent. The effects of the antenna power pattern on the corrected antenna temperature T*/sub A/ are calculated for several simple models of the source brightness distribution. (auth)</abstract><cop>United States</cop><doi>10.1086/190361</doi></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0067-0049 |
| ispartof | Astrophys. J., Suppl. Ser.; (United States), 1976-03, Vol.30, p.247 |
| issn | 0067-0049 1538-4365 |
| language | eng |
| recordid | cdi_crossref_primary_10_1086_190361 |
| source | EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | 640105 - Astrophysics & Cosmology- Galaxies ANTENNAS CALIBRATION CHEMICAL COMPOSITION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COSMIC RADIO SOURCES ELECTRICAL EQUIPMENT ELECTROMAGNETIC RADIATION INTERSTELLAR SPACE MEASURING INSTRUMENTS MOLECULES RADIATIONS RADIOWAVE RADIATION SPACE SPECTRA SPECTROMETERS |
| title | Absolute calibration of millimeter-wavelength spectral lines |
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