Re: your question

From: Rachel G. (gibbo@panisse.lbl.gov)
Date: Wed Mar 17 2004 - 12:18:09 PST

  • Next message: Robert A. Knop Jr.: "Installing deeplib for the search"

    Hi Ariel,

        The ACS conversions look good. However, there are some
    differences (1% in most cases). Mine come from passing
    Rob's spectroscopic templates through "synphot". Do we have
    the same response curve information? Not suprizingly, the
    largest offset is seen for the widest band, F110W, which has
    a rather ugly profile. Of course, this won't affect the ACS
    search in any way, but let's compare at some point.

        The conversions I have compared to yours are the following :

                               synphot:
     I775AB = I775Vega + 0.40 -> 0.414
     Z850AB = Z850Vega + 0.56 -> 0.550
     J110AB = J110Vega + 0.71 -> 0.764
     H160AB = H160Vega + 1.34 -> 1.352

        Also, if it's not too much trouble, would you mind
    adding to the right side of your plots the AB magnitude
    scale?

    Rachel

    On Wed, 17 Mar 2004, Ariel Goobar wrote:

    > Hi Saul,
    > I added the Vega->AB conversions (Rachel, please check!) + looked
    > into your question on the tail vs main pop. What happens is that
    > the label on the plot is slightly missleading. It says "discovery"
    > magnitude, but what it really is supposed to be is the magnitude
    > at the time of search. As I am simulating a "classical" search,
    > of course the field will contain SNe way past max. Such ones we
    > will not detected, and will not appear in later plots. Nevertheless,
    > they are shown in Fig 3. As this shows anything within 100 days
    > from max, see slice at z~1.25 in a new plot added. So,
    > as it is more likely to hit a SNe away from max than close to max, these
    > faint magnitudes are most populated. However, it is the ones in
    > the "bright tail" that will be discovered. Sorry if this
    > confused you. I hope is more clear now.
    > Ariel
    >
    > --
    > ___________________________________________________________________
    > Ariel Goobar (www.physto.se/~ariel)
    > Department of Physics, Stockholm University
    > AlbaNova University Center, SE-106 91 Stockholm, SWEDEN
    > tel: +46 8 55378659 fax: +46 8 55378601
    >

    This archive was generated by hypermail 2.1.4 : Wed Mar 17 2004 - 12:18:35 PST