From: Eric Linder (evlinder@lbl.gov)
Date: Sat Jan 21 2006 - 13:16:02 PST
ClusterSN group,
Sorry I missed the telecon this week - I was caught in another meeting.
I attach the latest version of a SN cosmology plot to replace last
year's Figure 2c (2a and 2b are still strong illustrations of why
cluster ellipticals are the place to work). (Saul: I've changed the
top labeling a little but the contours are the same as what you saw
yesterday). I think it tells the story well: we are making steady
progress, that even 4 hi z SN are helping (magenta dot-dash vs. red
dash). But more numbers help with not just usual statistics but to
average out gravitational lensing de/amplification. With 22 SN by
the end of our proposed next cycle of observations (black solid), we
have a strong improvement. Adding in hi z field ellipticals from us
and other observations to bring the total to 30 (blue dotted) does
not particularly help further, i.e. our Cycle 15 proposal is
important but random HST SN searches do not have its impact.
Also, I suggest adding a couple of lines to the proposal on multiple
SN per cluster:
"With our observed success of 40% in high redshift SN per cluster,
this implies that there is a 16% chance of observing two SN in the
same cluster (consistent with our observations to date). Having
multiple SN along the same line of sight opens the possibility to
begin exploring issues of IGM dust (knowing the Milky Way extinction
must be the same for the two SN), effects of local "Hubble bubble" or
velocity field correlations, or cluster substructure lensing."
Cheers,
Eric
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