Planetary nebula distances re-examined: an improved statistical scale

Details Planetary nebula distances re-examined: an improved statistical scale Planetary nebula distances re-examined: an improved statistical scale

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.353..589p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 353, Issue 2, pp. 589-600.

Astronomy and Astrophysics

Astronomy

47

Ism: Jets And Outflows, Planetary Nebulae: General

Scientific paper

The distances of planetary nebulae (PNe) are still quite uncertain. Although observational estimates are available for a small proportion of PNe, based on statistical parallax and the like, such distances are very poorly determined for the majority of galactic PNe. In particular, estimates of so-called `statistical' distance appear to differ by factors of ~2.7.
We point out that there is a well-defined correlation between the 5-GHz luminosity of the sources, L5, and their brightness temperatures, TB. This represents a different trend to those investigated in previous statistical analyses, and permits us to determine independent distances to a further 449 outflows. These distances are shown to be closely comparable to those determined using a TB-R correlation, providing that the latter trend is taken to be non-linear.
This non-linearity in the TB-R plane has not been noted in previous analyses, and is likely responsible for the broad (and conflicting) ranges of distance that have previously been published.
Finally, we point out that there is a close accord between observed trends within the L5-TB and TB-R planes, and the variation predicted through nebular evolutionary modelling. This is used to suggest that observational biases are probably modest, and that our revised distance scale is reasonably trustworthy.

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