Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.158h&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We use a Monte Carlo simulation of the Calan/Tololo photographic supernova survey to show that a simple model of the survey's selection effects accounts for the observed distribution of recession velocity, apparent magnitude, angular offset and projected radial distance between the supernova and the host galaxy nucleus for this sample of Type Ia supernovae (SNe Ia). The model includes biases due to the flux-limited nature of the survey, the different light curve morphologies displayed by different SNe Ia, and the difficulty of finding events projected near the central regions of the host galaxies. From the simulation we estimate the bias in the zero-point and slope of the absolute magnitude-decline rate relation used in SNe Ia distance measurements. For an assumed scatter of 0.15 mag about this relation, the selection effects decrease the zero-point by 0.04 mag. The slope of the relationship, is not significantly biased. We conclude that despite selection effects in the survey, the shape and zero-point of the relation determined from the Calan/Tololo sample are quite reliable. We next estimate the degree of incompleteness of the survey as a function of decline rate; this is used to estimate a "corrected" luminosity function for SNe Ia in which the frequency of SNe appears to increase linearly with decline rate. Finally, we compute the integrated detection efficiency of the simulation in order to infer the rate of SNe Ia from the 31 events found by the survey. For a value of H0=65 km/sec/Mpc we obtain a SN Ia rate of 0.21(+0.30)(-0.13) SNu. This is in excellent agreement with the value 0.16+/-0.05 SNu recently published by Capellaro et al. (1997).
Hamuy Mario
Pinto Philip
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