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For refcode 1993ApJ...415....1S:
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Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...415....1S THE HUBBLE DIAGRAM IN V FOR SUPERNOVAE OF TYPE Ia AND THE VALUE OF H_0_ THEREFROM ALLAN SANDAGE The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 AND G. A. TAMMANN Astronomisches Institut der Universitat Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland, and European Southern Observatory, Karl- Schwarzschild-Strasse 2, D-8049 Garching/Munchen, Germany Received 1993 March 2; accepted 1993 March 29 ABSTRACT The Hubble diagram for supernovae of Type Ia is derived in V and is summarized from the literature in m_pg_ and in B. The ridge line equation of the diagram in V is log v_220_ = 0.2 m_v_ + (0.653 +/- 0.012) from 34 SNe Ia. The dispersion of a single point about the ridge line is 0.36 mag. We argue from external evidence that the intrinsic dispersion is likely to be as small or smaller than {sigma})v_(max) = 0.2 mag. The intrinsic (B - V) color at B maximum light is 0.09 +/- 0.04 mag. The calibration of the absolute magnitudes at maximum from four concordant methods, including the determination for SN 1937C via Cepheids in IC 4182, is <M_B_(max)> = - 19.55 +/- 0.14 and M__V_(max) = - 19.71 +/- 0.13. These values lead to the long distance scale with <H_0_> between 45 and 52 km s^-1^ Mpc^-1^. This range depends on whether we use (1) the SN Hubble diagrams in the m_pg_, B, and V bands themselves from Figure 1, or (2) the derived virgo Cluster distance of 23.9 +/- 2.4 Mpc found from the SN 1937C calibration alone at M_V_(max) = - 19.76, applied to the six SNe Ia with adequate V photometry that have appeared in the cluster with <V(max)> = 12.13 +/- 0.14. By the precepts previously developed for the Virgo velocity relative to the cosmic frame (Sandage & Tammann 1990; Jerjen & Tammann 1992), this Virgo distance gives the cosmic value of the Hubble constant to be H_0_ = 47 +/- 5 km s^-1^ Mpc^-1^. Subject headings: distance scale - supernovae: general
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