The Planetary Nebulae Distance to M101

Details The Planetary Nebulae Distance to M101 The Planetary Nebulae Distance to M101

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461l..25f&link_type=abstract

Astrophysical Journal Letters v.461, p.L25

Astronomy and Astrophysics

Astronomy

9

Galaxies: Distances And Redshifts, Cosmology: Distance Scale, Galaxies: Individual Messier Number: M101, Galaxies: Individual Ngc Number: Ngc 5457, Ism: Planetary Nebulae: General

Scientific paper

We report the results of an [O III] lambda 5007 survey for planetary nebulae (PNs) in the giant Sc galaxy M101 (NGC 5457). By comparing on-band/off-band [O III] lambda 5007 images with images taken in H alpha and the R-band filter, we identify 65 PN candidates in the interarm and outer regions of the galaxy. From these data and the empirical planetary nebula luminosity function (PNLF), we derive a distance to the galaxy of 7.7 +/- 0.5 Mpc, in excellent agreement with the distance of 7.4 +/- 0.7 Mpc measured using Hubble Space Telescope observations of Cepheids (Kelson and coworkers). This observation demonstrates that the PNLF technique can be successfully applied to late-type galaxies, and provides an important overlap between the Population I and Population II distance scales. It also places a strong limit on the possible variation of the PNLF with population age.

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