Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz

W. J. Altenhoff, John H Bieging, B. Butler, H. M. Butner, R. Chini, C. G T Haslam, E. Kreysa, R. N. Martin, R. Mauersberger, J. McMullin, D. Muders, W. L. Peters, J. Schmidt, J. B. Schraml, A. Sievers, P. Stumpff, C. Thum, A. Von Kap-herr, H. Wiesemeyer, J. E. WinkR. Zylka

Research output: Contribution to journalArticle

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Abstract

We have observed both Comets Hyakutake and Hale-Bopp close to perigee with several telescopes at frequencies between 30 and 860 GHz for an extended period of time. The observed "light" curves can be described as a simple function of heliocentric and geocentric distances without any outburst or noticeable variability with time. Our most sensitive diameter estimate for C/Hyakutake resulted in an upper limit of 2.1 km. The nuclear diameter of C/Hale-Bopp was determined to 44.2 km after separation from the halo emission. The central part of both halos can be represented by a Gaussian with a linear size at half power points of 1870 and 11080 km for Hyakutake and Hale-Bopp, respectively. The spectral index for both comets is α = 2.8, indicating a similar particle size distributions in the halo of these comets. For Hale-Bopp the extended emission could be traced to more than 105 km from its nucleus. The derived masses, contained in the halo depend strongly on the assumed physical properties of the halo particles. With κ(1mm) = 75 cm2/g. possibly more appropriate for comets, a halo mass of 6 1010 g is derived for Hyakutake and of 8 1012 g for Hale-Bopp.

Original languageEnglish (US)
Pages (from-to)1020-1034
Number of pages15
JournalAstronomy and Astrophysics
Volume348
Issue number3
StatePublished - 1999

Fingerprint

Hale-Bopp
comets
comet
halos
radio
continuums
outburst
particle size distribution
physical property
light curve
particle size
physical properties
telescopes
nuclei
estimates

Keywords

  • Comets: general
  • Comets: individual: c/hyakutake
  • Comets: individual: hale-bopp
  • Radiation mechanisms: thermal
  • Radio continuum: ISM

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Altenhoff, W. J., Bieging, J. H., Butler, B., Butner, H. M., Chini, R., Haslam, C. G. T., ... Zylka, R. (1999). Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz. Astronomy and Astrophysics, 348(3), 1020-1034.

Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz. / Altenhoff, W. J.; Bieging, John H; Butler, B.; Butner, H. M.; Chini, R.; Haslam, C. G T; Kreysa, E.; Martin, R. N.; Mauersberger, R.; McMullin, J.; Muders, D.; Peters, W. L.; Schmidt, J.; Schraml, J. B.; Sievers, A.; Stumpff, P.; Thum, C.; Von Kap-herr, A.; Wiesemeyer, H.; Wink, J. E.; Zylka, R.

In: Astronomy and Astrophysics, Vol. 348, No. 3, 1999, p. 1020-1034.

Research output: Contribution to journalArticle

Altenhoff, WJ, Bieging, JH, Butler, B, Butner, HM, Chini, R, Haslam, CGT, Kreysa, E, Martin, RN, Mauersberger, R, McMullin, J, Muders, D, Peters, WL, Schmidt, J, Schraml, JB, Sievers, A, Stumpff, P, Thum, C, Von Kap-herr, A, Wiesemeyer, H, Wink, JE & Zylka, R 1999, 'Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz', Astronomy and Astrophysics, vol. 348, no. 3, pp. 1020-1034.
Altenhoff WJ, Bieging JH, Butler B, Butner HM, Chini R, Haslam CGT et al. Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz. Astronomy and Astrophysics. 1999;348(3):1020-1034.
Altenhoff, W. J. ; Bieging, John H ; Butler, B. ; Butner, H. M. ; Chini, R. ; Haslam, C. G T ; Kreysa, E. ; Martin, R. N. ; Mauersberger, R. ; McMullin, J. ; Muders, D. ; Peters, W. L. ; Schmidt, J. ; Schraml, J. B. ; Sievers, A. ; Stumpff, P. ; Thum, C. ; Von Kap-herr, A. ; Wiesemeyer, H. ; Wink, J. E. ; Zylka, R. / Coordinated radio continuum observations of comets Hyakutake and Hale-Bopp from 22 to 860 GHz. In: Astronomy and Astrophysics. 1999 ; Vol. 348, No. 3. pp. 1020-1034.
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AU - Altenhoff, W. J.

AU - Bieging, John H

AU - Butler, B.

AU - Butner, H. M.

AU - Chini, R.

AU - Haslam, C. G T

AU - Kreysa, E.

AU - Martin, R. N.

AU - Mauersberger, R.

AU - McMullin, J.

AU - Muders, D.

AU - Peters, W. L.

AU - Schmidt, J.

AU - Schraml, J. B.

AU - Sievers, A.

AU - Stumpff, P.

AU - Thum, C.

AU - Von Kap-herr, A.

AU - Wiesemeyer, H.

AU - Wink, J. E.

AU - Zylka, R.

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N2 - We have observed both Comets Hyakutake and Hale-Bopp close to perigee with several telescopes at frequencies between 30 and 860 GHz for an extended period of time. The observed "light" curves can be described as a simple function of heliocentric and geocentric distances without any outburst or noticeable variability with time. Our most sensitive diameter estimate for C/Hyakutake resulted in an upper limit of 2.1 km. The nuclear diameter of C/Hale-Bopp was determined to 44.2 km after separation from the halo emission. The central part of both halos can be represented by a Gaussian with a linear size at half power points of 1870 and 11080 km for Hyakutake and Hale-Bopp, respectively. The spectral index for both comets is α = 2.8, indicating a similar particle size distributions in the halo of these comets. For Hale-Bopp the extended emission could be traced to more than 105 km from its nucleus. The derived masses, contained in the halo depend strongly on the assumed physical properties of the halo particles. With κ(1mm) = 75 cm2/g. possibly more appropriate for comets, a halo mass of 6 1010 g is derived for Hyakutake and of 8 1012 g for Hale-Bopp.

AB - We have observed both Comets Hyakutake and Hale-Bopp close to perigee with several telescopes at frequencies between 30 and 860 GHz for an extended period of time. The observed "light" curves can be described as a simple function of heliocentric and geocentric distances without any outburst or noticeable variability with time. Our most sensitive diameter estimate for C/Hyakutake resulted in an upper limit of 2.1 km. The nuclear diameter of C/Hale-Bopp was determined to 44.2 km after separation from the halo emission. The central part of both halos can be represented by a Gaussian with a linear size at half power points of 1870 and 11080 km for Hyakutake and Hale-Bopp, respectively. The spectral index for both comets is α = 2.8, indicating a similar particle size distributions in the halo of these comets. For Hale-Bopp the extended emission could be traced to more than 105 km from its nucleus. The derived masses, contained in the halo depend strongly on the assumed physical properties of the halo particles. With κ(1mm) = 75 cm2/g. possibly more appropriate for comets, a halo mass of 6 1010 g is derived for Hyakutake and of 8 1012 g for Hale-Bopp.

KW - Comets: general

KW - Comets: individual: c/hyakutake

KW - Comets: individual: hale-bopp

KW - Radiation mechanisms: thermal

KW - Radio continuum: ISM

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