Quote:
Originally Posted by Jerry
Yes and no. What they are observing in the Ellis study is greater variance in the UV magnitude than is found in the local 'type Ia' templates. Without local guidence, we are in unchartered waters.
The (1+z)^4 correction factor is a relativistic as well as a Big Bang requirement. If the magnitude correction is wrong, it would mean either the redshift is NOT due to expansion, or current relativity theory does not correctly define expansion attenuation, or both. In cases I and III, this would also mean that the time dilation correction is also wrong. The time dilation correction shortens the light curves, and without this correction, the light curves observed at high redshift would be much longer than the local sample. If the lightcurve length/magnitude relationship holds up, this would mean these supernova should be truly brighter!
The net result of such a major miscalculation is difficult to assess, but the best clue might be the fact that far fewer supernovae have been observed at cosmic distances than were expected, based upon the local count. If you assume the supernova population is not really greater in local space, the only realistic conclusion is that the extinction factors are much greater than currently calculated, so these distant supernova are again, truly brighter. This line of reasoning also greatly effects the magnitudes of galaxies, quasars all objects at cosmic distances, and the implications are staggering.
It is important to stress that most supernova researchers currently believe that the magnitude errors are very small in spite of the peculiar high energy lightcurves. What is cool, is that no one really knows, and this type of oddity may portend dramatic shifts of reasoning in the future.
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Jerry. Somewhere in my readings over the last few weeks, amidst, moving, closing out my gardens, and setting up my classes, in five different locations....I came across either a paper, or an ArXiv preprint summary....and it said they had found an unexpected source of bias in the distant type1a standard candles....galactic light spillover. Evidently, the surveys of distant galaxies for type 1a candles, and the surveys of less distant galaxies (z's of redshift, not the particles), had been done systemically with the same instrumental slit-width on the telescope. Since a more distant galaxy subtends a smaller angle, it fits into the slit better. The supernova is relatively point-like...and the long exposure spills extra galactic light into the spectrum, reddening it, because of interstellar reddening effects within the host galaxy. (This is not my spiel...I'll hunt for the reference again...I thought I'd find someone here jumping up and down about it). Obviously, it hints that acceleration reddening...or UV spectral anomalies are somehow in cahoots here. Might not be so much dark energy after all. Interesting? Hmm.
Pete.
still hunting, but see also, the following....apparently different areas of the same galaxy show different reddening (I'm not even going there)...the authors do. see:
http://arxiv.org/PS_cache/arxiv/pdf/...710.4503v1.pdf