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Time Dilation in the Light Curve of the Distant Type Ia Supernovae SN 1995K | | B. Leibundgut
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22 May 1996 | | Journal: | Astrophys.J. 466 (1996) L21 | | Abstract: | The light curve of a distant Type Ia supernova acts like a clock that can be used to test the expansion of the Universe. SN~1995K, at a spectroscopic redshift of $z = 0.479$, provides one of the first meaningful data sets for this test. We find that all aspects of SN~1995K resemble local supernova Ia events when the light curve is dilated by $(1+z)$, as prescribed by cosmological expansion. In a static, non-expanding universe SN~1995K would represent a unique object with a spectrum identifying it as a regular Type Ia supernova but a light curve shape and luminosity which do not follow the well-established relations for local events. We conclude that SN~1995K provides strong evidence for an interpretation of cosmological redshifts as due to universal expansion. Theories in which photons dissipate their energy during travel are excluded as are age-redshift dependencies. | | Source: | arXiv, astro-ph/9605134 | | Services: | Forum | Review | PDF | Favorites | |
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