A systematic effect in the use of planetary nebulae as standard candles

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Hubble Constant, Luminous Intensity, Maximum Likelihood Estimates, Planetary Nebulae, Virgo Galactic Cluster, Distance, Galactic Evolution, Least Squares Method

Scientific paper

The use of bright planetary nebulae for distance determination is examined in terms of a dependence between the planetary nebulae luminosity function (PNLF) and the intrinsic luminosity of the parent galaxy. A study of the Leo I galaxies' PNLFs and the parent galaxies' magnitudes demonstrates a similar correlation. Using distance estimates derived with the surface-brightness-fluctuation method it is shown that smaller distances are consistently assigned to more luminous galaxies. An exponential portion of the bright end of the PNLFs accounts for the systematic effects including an increase in the specific PN density from luminous to faint galaxies. The use of an exponential LF is proposed as a distance indicator with attention given to the calibration of the Hubble's constant. An example is outlined in which the exponential LF method gives a value that varies significantly from previous estimates.

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