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1842344520
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note
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-1 at 230 GHz. Whenever possible, a frequency-switching mode was used.
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6
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1842276453
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note
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The HPBW of the JCMT antenna is 14 arc sec at 345 GHz. Most data were obtained in the 300-to 370-GHz window with a spectral resolution of 95 kHz, in the frequency-switching mode.
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7
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Observations with the Nançay radio telescope (right ascension × declination of the HPBW was 3.5 arc min × 19 arc min) were undertaken with the technique previously used for comet P/Halley and other comets [E. Gérard, D. Bockelée-Morvan, G. Bourgois, P. Colom, J. Crovisier, Astron. Astrophys. Suppl. Ser. 77, 278 (1989)].
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Wootten, A.1
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1842388112
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A. Wootten et al., IAU Circular 6362 (1996); L. M. Woodney, J. McMullin, M. F. A'Hearn, IAU Circular 6344 (1996); D. C. Lis et al., in preparation; D. C. Lis et al., IAU Circular 6362 (1996).
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Lis, D.C.1
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thesis, Université Joseph Fourier, Grenoble, France
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A. Enzian, thesis, Université Joseph Fourier, Grenoble, France (1997).
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Enzian, A.1
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1842324378
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note
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h < 2.5 AU. Detailed modeling is needed to examine whether this effect is significant.
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20
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1842380341
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note
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When the outgassing is isotropic, the width of the parent molecule radio line at half intensity is close to twice the gas expansion velocity. The lines observed in comet Hale-Bopp indicate preferential outgassing toward Earth. Hence, the outflow velocity can be only estimated from the blue wing of the profile.
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23
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F. P. Schloerb, W. M. Kinzel, D. A. Swade, W. M. Irvine, Astron. Astrophys. 187, 475 (1987).
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in preparation
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-1. We used the OH lifetime computed at solar minimum [S. A. Budzien, M. C. Festou, P. D. Feldman, Icarus 107, 164 (1994)].
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Gérard, E.1
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0000274280
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-1. We used the OH lifetime computed at solar minimum [S. A. Budzien, M. C. Festou, P. D. Feldman, Icarus 107, 164 (1994)].
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1842386152
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note
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Haser molecular density distributions assume isotropic outflow at constant velocity. Production rates calculated with a more realistic angular density distribution are at most 15% higher.
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32
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0001349317
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2CO, as measured in comet P/Halley [R. Meier, P. Eberhardt, D. Krankovsky, R. Hodges, Astron. Astrophys. 277, 677 (1993)].
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Meier, R.1
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Delsemme, A.H.1
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1842317677
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2CO production rate computed by assuming an extended source.
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16044366524
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W. M. Irvine et al., Nature 382, 418 (1996).
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Irvine, W.M.1
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1842392998
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2O expansion velocity (Fig. 2B) may be partly due to OH galactic contamination and the inability of the trapezium method to interpret asymmetric lines.
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47
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1842386151
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note
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The JCMT is operated by The Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada. The Nançay Radio Observatory is operated by the Unité Scientifique de Nançay of the Observatoire de Paris, associated as Unité de Service et de Recherche (USR) B704 to CNRS. The Nançay Observatory also gratefully acknowledges the financial support of the Conseil Régional of the Région Centre in France. This research has been supported by the Programme National de Planétologie de l'Institut National des Sciences de l'Univers and CNRS (URA 1757).
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