From: Marc Postman (postman@stsci.edu)
Date: Tue Jan 17 2006 - 07:14:59 PST
Here is a revised plot that combines both the color and spectroscopic
info. This plot shows the color offsets (relative to the mean color of
the red sequence) for All ellipticals, for those ellipticals with
redshifts < 1, for those ellipticals with redshifts > 1 but which are
not cluster members, and for those ellipticals with redshifts > 1 that
are cluster members. All but one of the z<1 ellipticals lie in the
color offset range consistent with the blue ellipticals, demonstrating
that the counts to the left of the red sequence peak are almost all
foreground galaxies at z < 1. All the cluster ellipticals lie under the
peak centered on zero offset from the red sequence. The dashed line
shows the mean number of ellipticals per bin in the region where the
foreground (blue) ellipticals live - one can (I think anyway) easily
see in this plot that the overdensity in color and redshift space are
similar.
Maybe this is the plot we should use in the proposal.
Marc
On Jan 14, 2006, at 1:59 AM, Saul Perlmutter wrote:
> ...I'll be curious to hear what other people think, but I suspect that
> the previous figure you sent (with delta z/1+z on the x-axis) makes
> the case more strongly. (Actually, why do I get the impression from
> this plot that there are comparable number of ellipticals+S0 in the
> cluster and in the field above z>1, while the previous plot suggests
> that the ratio is more like 3.5 to 1?) If we go with the previous
> plot, can you redo it with all (and only) galaxies above z=1? --S
>
>
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Marc Postman Email: postman@stsci.edu
STScI - CMO Phone: +1-410-338-4340
3700 San Martin Drive Fax: +1-410-338-4424
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