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Type Ia supernovae as standard candlesThe distribution of absolute blue magnitudes among Type Ia supernovae (SNs Ia) is studied. Supernovae were used with well determined apparent magnitudes at maximum light and parent galaxies with relative distances determined by the Tully-Fisher or Dn - sigma techniques. The mean absolute blue magnitude is given and the observational dispersion is only sigma(MB) 0.36, comparable to the expected combined errors in distance, apparent magnitude, and extinction. The mean (B-V) color at maximum light is 0.03 +/- 0.04, with a dispersion sigma(B-V) = 0.20. The Cepheid-based distance to IC 4182, the parent galaxy of the normal and unextinguished Type Ia SN 1937C, leads to a Hubble constant of H(0) + 51 +/- 12 km/s Mpc. The existence of a few SNs Ia that appear to have been reddened and dimmed by dust in their parent galaxies does not seriously compromise the use of SNs Ia as distance indicators.
Document ID
19930044664
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Branch, David
(NASA Headquarters Washington, DC United States)
Miller, Douglas L.
(Oklahoma Univ. Norman, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 405
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A28661
Funding Number(s)
CONTRACT_GRANT: NAGW-2999
CONTRACT_GRANT: NSF AST-91-15061
Distribution Limits
Public
Copyright
Other

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