X-ray emission from comet Hale-Bopp

C. M. Lisse, K. Dennerl, J. Englhauser, J. Trümper, F. E. Marshall, R. Petre, A. Valinia, B. J. Kellett, R. Bingham

Research output: Contribution to journalArticle

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Abstract

The discovery of X-ray emission from comets has created a number of questions about the physical mechanism producing the radiation. There are now a variety of explanations for the emission, from thermal bremsstrahlung of electrons off neutrals or dust, to charge exchange induced emission from solar wind ions, to scattering of solar X-rays from attogram dust, to reconnection of solar magnetic field lines. In an effort to understand this new phenomenon, we observed but failed to detect in the X-ray the very dusty and active comet C/Hale-Bopp 1995 O1 over a two year period, September 1996 to December 1997, using the ROSAT HRI imaging photometer at 0.1–2.0 keV and the ASCA SIS imaging spectrometer at 0.5–10.0 keV. The results of our Hale-Bopp non-detections, when combined with spectroscopic imaging 0.08–1.0 keV observations of the comet by EUVE and BeppoSAX, show that the emission has the same spectral shape and strong variability seen in other comets. Comparison of the ROSAT photometry of the comet to our ROSAT database of 8 comets strongly suggests that the overall X-ray faintness of the comet was due to an emission mechanism coupled to gas, and not dust, in the comet’s coma.
LanguageEnglish
Pages283-291
Number of pages9
JournalEarth, Moon, and Planets
Volume77
Issue number3
DOIs
Publication statusPublished - May 1997

Fingerprint

Hale-Bopp comet
Hale-Bopp
comets
comet
x rays
dust
Extreme Ultraviolet Explorer satellite
solar magnetic field
coma
imaging spectrometers
photometer
charge exchange
bremsstrahlung
solar wind
photometry
photometers
spectrometer
scattering
magnetic field
electron

Keywords

  • comets
  • X-rays
  • solar system

Cite this

Lisse, C. M., Dennerl, K., Englhauser, J., Trümper, J., Marshall, F. E., Petre, R., ... Bingham, R. (1997). X-ray emission from comet Hale-Bopp. Earth, Moon, and Planets, 77(3), 283-291. https://doi.org/10.1023/A:1006274812124
Lisse, C. M. ; Dennerl, K. ; Englhauser, J. ; Trümper, J. ; Marshall, F. E. ; Petre, R. ; Valinia, A. ; Kellett, B. J. ; Bingham, R. / X-ray emission from comet Hale-Bopp. In: Earth, Moon, and Planets. 1997 ; Vol. 77, No. 3. pp. 283-291.
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Lisse, CM, Dennerl, K, Englhauser, J, Trümper, J, Marshall, FE, Petre, R, Valinia, A, Kellett, BJ & Bingham, R 1997, 'X-ray emission from comet Hale-Bopp' Earth, Moon, and Planets, vol. 77, no. 3, pp. 283-291. https://doi.org/10.1023/A:1006274812124

X-ray emission from comet Hale-Bopp. / Lisse, C. M.; Dennerl, K.; Englhauser, J.; Trümper, J.; Marshall, F. E.; Petre, R.; Valinia, A.; Kellett, B. J.; Bingham, R.

In: Earth, Moon, and Planets, Vol. 77, No. 3, 05.1997, p. 283-291.

Research output: Contribution to journalArticle

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AU - Lisse, C. M.

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Lisse CM, Dennerl K, Englhauser J, Trümper J, Marshall FE, Petre R et al. X-ray emission from comet Hale-Bopp. Earth, Moon, and Planets. 1997 May;77(3):283-291. https://doi.org/10.1023/A:1006274812124