A technique for determining the extragalactic distance scale

Masashi Chiba, Yuzuru Yoshii

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We propose a method of distance determination based on the internal structure and dynamics of disk galaxies. The method relies on the universal luminosity profile of a stellar disk represented by an exponential law. Calibrating nearby galaxies with known distances, it is found that the scale length of the disk is tightly correlated with the specific combination of central surface brightness and rotational velocity at a characteristic radius of 2.15 scale lengths from the center. This suggests that the scale length of the disk may be used as an indicator for extragalactic distance scale. The application of this relation to M51 and M100 allows us to arrive at the distances of about 6 and 14 Mpc, respectively, implying a Hubble constant of H0 = 92-94 km s-1 Mpc-1.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalAstrophysical Journal
Volume442
Issue number1
DOIs
Publication statusPublished - 1995 Mar 20

Keywords

  • Distance scale
  • Galaxies: kinematics and dynamics
  • Galaxies: photometry
  • Galaxies: spiral
  • Galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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