Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

100-GHZ BAND TEST OBSERVATIONS OF THE KVN 21-M RADIO TELESCOPES

  • Received : 2011.12.02
  • Accepted : 2011.04.14
  • Published : 2011.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

We carry out 100-GHz band test observations with the newly-constructed KVN 21-m radio telescopes in order to evaluate their performance. The three telescopes have similar performance parameters. The pointing accuracies are about 4" rms for the entire sky. The main beam sizes are about 30" (FWHMs), which is nearly the diffraction limit of the telescopes at the observing frequency (97 GHz). The measured aperture and main-beam efficiencies are about 52% and 46%, respectively, for all three telescopes. The estimated moon efficiency is ~84% for the KVN Tamna telescope. The first sidelobes appear 50" (~1.6${\times}$FWHM) from the main beam centers and the levels are on average -14 dB.

Keywords

References

  1. Altenhoff, W. J., Baars, J. W. M., Wink, J. E., & Downes, D. 1987, Observations of Anomalous Refraction at Radio Wavelengths, A&A, 184, 381
  2. Asaki, Y., Shibata, K. M., Kawabe, R., Roh, D.-G., Saito, M., Morita, K.-I., & Sasao, T. 1998, Phase Compensation Experiments with the Paired Antennas Method 2. Millimeter-wave Fringe Correction Using Centimeter-Wave Reference, Radio Science, 33, 1297 https://doi.org/10.1029/98RS01607
  3. Chung, M.-H., Byun, D.-Y., & Khaikin, V. B. 2006, Gain Degradation of KVN 21-m Shaped Cassegrain Antenna due to Misalignment of Antenna Optics, Journal of Astronomy and Space Sciences, 23, 327 https://doi.org/10.5140/JASS.2006.23.4.327
  4. Fahd, A. K., et al. 1992, NASA Technical Report No. 1992-1: Study and Interpretation of the Millimeter Wave Spectrum of Venus, 105
  5. Green, K. A. 1963, Modified Cassegrain Antenna for Arbitrary Aperture Illumination, IEEE Transactions on Antennas and Propagation, 11, 589 https://doi.org/10.1109/TAP.1963.1138084
  6. Greve, A., Kramer, C., & Wild, W. 1998, The Beam Pattern of the IRAM 30-m Telescope, A&AS, 133, 271 https://doi.org/10.1051/aas:1998454
  7. Han, S.-T., Lee, J.-W., Kang, J., Je, D.-H., Chung, M.-H., Wi, S.-O., Sasao, T., & Wylde, R. 2008, Millimeter-Wave Receiver Optics for Korean VLBI Network, International Journal of Infrared and Millimeter Waves, 29, 69 https://doi.org/10.1007/s10762-007-9296-7
  8. Hay, S. 2008, Calculated KVN 21-m Antenna Efficiency
  9. Jung, T., Sohn, B. W., Kobayashi, H., Sasao, T., Hirota, T., Kameya, O., Choi, Y. K., & Chung, H. S. 2011, First Simultaneous Dual-Frequency Phase Referencing VLBI Observation with VERA, PASJ, 63, 375 https://doi.org/10.1093/pasj/63.2.375
  10. Kim, H.-G., Han, S.-T., Sohn, B. W., Oh, S.-J., Je, D.-H., Wi, S.-O., & Song, M.-G. 2004, Construction of the Korean VLBI Network (KVN), Proceedings of the 7th Symposium of the European VLBI Network on New Developments in VLBI Science and Technology, 281
  11. Koo, B,-C., Park, Y.-S., Hong, S. S., Yun, H.-S., Lee, S.-G., Byun, D.-Y., Lee, J.-W., Choi, H.-K., Lee, S.-S., Yoon, Y.-Z., Kim, K.-T., Kang, H. W., Lee, J.-E. 2003, Performance of the SRAO 6-Meter Radio Telescope, JKAS, 36, 43 https://doi.org/10.5303/JKAS.2003.36.1.043
  12. Kutner, M. L., & Ulich, B. L. 1981, Recommendations for Calibration of Millimeter-Wavelength Spectral Line Data, ApJ, 250, 341 https://doi.org/10.1086/159380
  13. Linsky, J. L. 1973, The Moon as a Proposed Radiometric Standard for Microwave and Infrared Observations of Extended Sources, ApJS, 25, 163 https://doi.org/10.1086/190266
  14. Mangum, J. G. 1993, Main-Beam E±ciency Measurements of the Caltech Submillimeter Observatory, PASP, 105, 117 https://doi.org/10.1086/133134
  15. Mangum, J. G. 2001, ALMA Memo 366: A Telescope Pointing Algorithm for ALMA
  16. Middelberg, E., Roy, A. L., Walker, R. C., & Falcke, H. 2005, VLBI Observations of Weak Sources Using Fast Frequency Switching, A&A, 433, 897 https://doi.org/10.1051/0004-6361:20042078
  17. Rho, D.-G., & Jung, J. H. 1999, Characteristics of TRAO 14-m Radio Telescope, 14, 123
  18. Rohlfs, K., & Wilson, T. L. 1996, Tools of Radio Astronomy (Berlin: Springer-Verlag), 137-141
  19. Schloerb, F. P., & Snell, R. L. 1980, FCRAO Report No. 150
  20. Ulich, B. L. 1981, Millimeter-Wavelength Continuum Calibration Sources, AJ, 86, 1619 https://doi.org/10.1086/113046
  21. Yi, J., & Jung, T.-H. 2008, Image Simulations for the KVN Using the VLBA Image of SiO Masers, PKAS, 23, 37 https://doi.org/10.5303/PKAS.2008.23.2.037

Cited by

  1. INTERACTIONS OF THE INFRARED BUBBLE N4 WITH ITS SURROUNDINGS vol.818, pp.1, 2016, https://doi.org/10.3847/0004-637X/818/1/95
  2. Star Formation Conditions in a Planck Galactic Cold Clump, G108.84–00.81 vol.231, pp.1, 2017, https://doi.org/10.3847/1538-4365/aa7b31
  3. L1599B: CLOUD ENVELOPE AND C+EMISSION IN A REGION OF MODERATELY ENHANCED RADIATION FIELD vol.824, pp.2, 2016, https://doi.org/10.3847/0004-637X/824/2/141
  4. A MULTI-EPOCH, SIMULTANEOUS WATER AND METHANOL MASER SURVEY TOWARD INTERMEDIATE-MASS YOUNG STELLAR OBJECTS vol.196, pp.2, 2011, https://doi.org/10.1088/0067-0049/196/2/21
  5. DISCOVERY OF AN EXTREMELY WIDE-ANGLE BIPOLAR OUTFLOW IN AFGL 5142 vol.824, pp.1, 2016, https://doi.org/10.3847/0004-637X/824/1/31
  6. Single-Dish Performance of KVN 21 m Radio Telescopes: Simultaneous Observations at 22 and 43 GHz vol.123, pp.910, 2011, https://doi.org/10.1086/663326
  7. PLANCK COLD CLUMPS IN THEλORIONIS COMPLEX. I. DISCOVERY OF AN EXTREMELY YOUNG CLASS 0 PROTOSTELLAR OBJECT AND A PROTO-BROWN DWARF CANDIDATE IN THE BRIGHT-RIMMED CLUMP PGCC G192.32–11.88 vol.222, pp.1, 2016, https://doi.org/10.3847/0067-0049/222/1/7
  8. THE INFLOW SIGNATURE TOWARD DIFFERENT EVOLUTIONARY PHASES OF MASSIVE STAR FORMATION vol.225, pp.2, 2016, https://doi.org/10.3847/0067-0049/225/2/21
  9. Chemical variation in molecular cloud cores in the Orion A Cloud. III vol.66, pp.6, 2014, https://doi.org/10.1093/pasj/psu116
  10. OPTICAL MULTI-CHANNEL INTENSITY INTERFEROMETRY - OR: HOW TO RESOLVE O-STARS IN THE MAGELLANIC CLOUDS vol.47, pp.6, 2014, https://doi.org/10.5303/JKAS.2014.47.6.235
  11. THE HCN/HNC ABUNDANCE RATIO TOWARD DIFFERENT EVOLUTIONARY PHASES OF MASSIVE STAR FORMATION vol.219, pp.1, 2015, https://doi.org/10.1088/0067-0049/219/1/2
  12. LINEAR POLARIZATION OF CLASS I METHANOL MASERS IN MASSIVE STAR-FORMING REGIONS vol.227, pp.2, 2016, https://doi.org/10.3847/0067-0049/227/2/17
  13. CANDIDATES FOR THE YOUNG STELLAR OUTFLOWS: WATER AND METHANOL MASERS FROM YOUNG STELLAR OBJECTS vol.144, pp.5, 2012, https://doi.org/10.1088/0004-6256/144/5/151
  14. EARLY SCIENCE WITH THE KOREAN VLBI NETWORK: EVALUATION OF SYSTEM PERFORMANCE vol.147, pp.4, 2014, https://doi.org/10.1088/0004-6256/147/4/77
  15. SIMULTANEOUS OBSERVATION OF WATER AND CLASS I METHANOL MASERS TOWARD CLASS II METHANOL MASER SOURCES vol.221, pp.1, 2015, https://doi.org/10.1088/0067-0049/221/1/6
  16. KVN Single-dish Water and Methanol Maser Line Surveys of Galactic YSOs vol.8, pp.S287, 2012, https://doi.org/10.1017/S1743921312007570
  17. Galactic HCO+ absorption toward compact extragalactic radio sources vol.363, pp.7, 2018, https://doi.org/10.1007/s10509-018-3372-4
  18. Sources vol.236, pp.2, 2018, https://doi.org/10.3847/1538-4365/aab88f
  19. Inflow Motions Associated with High-mass Protostellar Objects vol.235, pp.2, 2018, https://doi.org/10.3847/1538-4365/aab35f