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For refcode 1995ApJ...439..558V:
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Copyright by American Astronomical Society. Reproduced by permission
1995ApJ...439..558V THE BLUE AND VISUAL ABSOLUTE MAGNITUDE DISTRIBUTIONS OF TYPE Ia SUPERNOVAE THOMAS E. VAUGHAN, DAVID BRANCH, AND DOUGLAS L. MILLER University of Oklahoma, Department of Physics and Astronomy, 440 West Brooks Room 131, Norman, OK 73019 vaughan@phyast.nhn.uoknor.e:lu AND SAUL PERLMUTTER Lawrence Berkeley Laboratory 50-232, University of California, Berkeley, 1 Cyclotron Road, Berkeley, CA 94720 Received 1994 May 31; accepted 1994 August 8 ABSTRACT Tully-Fisher (TF), surface brightness fluctuation (SBF), and Hubble law distances to the parent galaxies of Type Ia supernovae (SNs Ia) are used in order to study the SN Ia blue and visual peak absolute magnitude (M_B_ and M_v_) distributions. We propose two objective cuts, each of which produces a subsample with small intrinsic dispersion in M. One cut, which can be applied to either band, distinguishes between a subsample of bright events and a smaller subsample of dim events, some of which were extinguished in the parent galaxy and some of which were intrinsically subluminous. The bright events are found to be distributed with an observed dispersion of 0.3 <~{sigma}_obs_(M) <~0.4 about a mean absolute magnitude (M^bar^_b_ or M^bar^_v_). Each of the dim SNs was spectroscopically peculiar and/or had a red B - V color; this motivates the adoption of an alternative cut that is based on B - V rather than on M. To wit, SNs Ia that are both known to have -0.25 <B - V < +0.25 and not known to be spectroscopically peculiar show observational dispersions of only {sigma}_obs_(M_B_) = {sigma}_obs_(M_V_) = 0.3. Because characteristic observational errors produce {sigma}_err_(M) > 0.2, the intrinsic dispersion among such SNs Ia is {sigma}_int_(M) <= 0.2. The small observational dispersion indicates that SNs Ia, the TF relation, and SBFs all give good relative distances to those galaxies that produce SNs Ia. The conflict between those who use SNs Ia in order to determine the value of the Hubble constant (H_0_) and those who use TF and SBF distances to determine H_0_ results from discrepant calibrations. Subject headings: distance scale supernovae: general
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