Distance determination to NGC 55 from the planetary nebula luminosity function

G. C. Van De Steene, G. H. Jacoby, C. Praet, Robin Bruce Ciardullo, H. Dejonghe

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Abstract

We analysed [O III], Hα, and continuum images of the Sculptor Group spiral galaxy NGC 55 obtained with the WFI instrument at the 2.2-m telescope of ESO. We identified 21 new planetary nebula candidates. We constructed the [O III]λ5007 Planetary Nebula Luminosity Function (PNLF) and determined a most likely distance of 2.30 ±0.35 Mpc. The distance to NGC 55 is a bit larger than previously determined distances, which means that the Sculptor Group is further away from the Local Group than previously thought. The PNLF distance to NGC 55 is comparable to the PNLF distance of NGC 300 (Soffner et al. 1996, A&A, 306, 9), adding support to the suggestion that these galaxies form a bound pair. There doesn't seem to be a shortage of planetary nebula candidates in this metal poor galaxy.

Original languageEnglish (US)
Pages (from-to)891-896
Number of pages6
JournalAstronomy and Astrophysics
Volume455
Issue number3
DOIs
Publication statusPublished - Sep 1 2006

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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