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A Generalized K Correction for Type Ia Supernovae: Comparing R-band Photometry Beyond z= 0.2 with B, V, and R-band Nearby Photometry
Alex Kim, Ariel Goobar and Saul Perlmutter
Publications of the Astronomical Society of the Pacific
Vol. 108, No. 720 (1996 February), pp. 190-201
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40680703
Page Count: 12
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Photometric measurements show that, as a group, nearby Type Ia supernovae follow similar light curves and reach similar peak magnitudes (Branch and Tammann, ARAA, 30, 359, 1992). Thus, these supernovae may serve as standard candles or calibrated candles at cosmological distances. Magnitudes of local and distant supernovae, both in the same filter band, are compared using a K correction to account for the different spectral regions incident on that filter. A generalized approach compares magnitudes in different bands for the nearby and distant supernovae, bands that are selected to give sensitivity in corresponding regions of the unredshifted and redshifted spectra. Thus, R magnitudes for supernovae at z≈0.5 are compared with magnitudes of local supernovae. We compute these generalized corrections over a range of redshifts and bandpass pairs and discuss their advantages over the traditional single-band whereas the traditional correction is less accurate and can be difficult to determine beyond z>0.2.
Publications of the Astronomical Society of the Pacific © 1996 The University of Chicago Press