Wide field imaging and the velocity structure in the coma of Hale-Bopp

Walter M Harris, Jeffrey P. Morgenthaler, Frank Scherb, Christopher Anderson, Ronald J. Oliversen

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The comae of very active comets have a substantially more complex coma than their weaker cousins. The primary cause of this is photolytic heating and collisions that occur over an everlarger volume of the coma as QH2O increases. Collisions with the photochemical daughters of water in this region modify the radial distributions and outflow velocity of each species, excite and quench metastable emissions, and introduce velocity gradients from photolytic heating. Comet Hale-Bopp was the first comet for which the collisional coma was both spatially resolvable and comparable in extent to the scale lengths of major coma species. In the case of this object, the classical assumptions that make it possible to invert radial emission line profiles, brightnesses, and lineshapes to production rate and velocity either do not hold or require adjustment to work. Here we describe how a large collision zone modifies the coma, how it affects the classical methods for obtaining production rate and velocity, and discuss how wide field imaging may be combined with modified versions of simple models to address the complications and extract some structural information.

Original languageEnglish (US)
Pages (from-to)45-56
Number of pages12
JournalEarth, Moon and Planets
Volume90
Issue number1-4
DOIs
StatePublished - Mar 2002
Externally publishedYes

Fingerprint

Hale-Bopp
coma
velocity structure
comet
comets
collision
collisions
heating
collision zone
Hale-Bopp comet
outflow
radial distribution
brightness
adjusting
gradients
causes
profiles
water
rate

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wide field imaging and the velocity structure in the coma of Hale-Bopp. / Harris, Walter M; Morgenthaler, Jeffrey P.; Scherb, Frank; Anderson, Christopher; Oliversen, Ronald J.

In: Earth, Moon and Planets, Vol. 90, No. 1-4, 03.2002, p. 45-56.

Research output: Contribution to journalArticle

Harris, WM, Morgenthaler, JP, Scherb, F, Anderson, C & Oliversen, RJ 2002, 'Wide field imaging and the velocity structure in the coma of Hale-Bopp', Earth, Moon and Planets, vol. 90, no. 1-4, pp. 45-56. https://doi.org/10.1023/A:1021556132765
Harris, Walter M ; Morgenthaler, Jeffrey P. ; Scherb, Frank ; Anderson, Christopher ; Oliversen, Ronald J. / Wide field imaging and the velocity structure in the coma of Hale-Bopp. In: Earth, Moon and Planets. 2002 ; Vol. 90, No. 1-4. pp. 45-56.
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