Re: color plot

From: Marc Postman (postman@stsci.edu)
Date: Tue Jan 17 2006 - 07:14:59 PST

  • Next message: Marc Postman: "Re: color plot"

    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
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