Hydrogen two-photon continuum emission from the Horseshoe filament in NGC 1275

R. M. Johnstone, R. E.A. Canning, A. C. Fabian, G. J. Ferland, M. Lykins, R. L. Porter, P. A.M. van Hoof, R. J.R. Williams

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Far-ultraviolet emission has been detected from a knot of Hα emission in the Horseshoe filament, far out in the NGC 1275 nebula. The flux detected relative to the brightness of the Hα line in the same spatial region is very close to that expected from hydrogen two-photon continuum emission in the particle heating model of Ferland et al. if reddening internal to the filaments is taken into account. We find no need to invoke other sources of far-ultraviolet emission such as hot stars or emission lines from Civ in intermediate-temperature gas to explain these data.

Original languageEnglish
Pages (from-to)1421-1429
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Sep 11 2012


  • Galaxies: clusters: individual: Perseus
  • Galaxies: individual: NGC 1275
  • Intergalactic medium
  • Ultraviolet: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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