From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Sat Apr 20 2002 - 14:54:41 PDT
Hi Isobel,
Yes, Satie was covered by the CTIO search last year; it has no CFHT
coverage. From the discovery information we can't rule out light in
last year's reference. Only if Rob has a lightcurve which shows there
isn't light in the ref will be able to deduce anything about the host
brightness from last year's CTIO data.
The lack of deep data from the last CTIO run means we won't know more
about Satie's host until the CTIO run in May unless we obtain
additional imaging data elsewhere. As we discussed last week, the
additional imaging option is not very efficient (and I don't think we
requested final references for Satie at VLT since it was an HST SN).
Based on Rachel's examination of the HST images we know that Satie's
host is not very extended. The HDFs suggest that 90% of objects with
FWHM < 0.3 arcsec will have I-magnitude less than about 27. (Since we
have a redshift we can probably use the size constraint to calculate a
better contraint using an upper limit galaxy surface brightness). In
this case we will never actually detect Satie's host in J-band unless
it is very red. Therefore, I think there is a good possibility that
deep optical groundbase (CTIO) or HST images of Satie's host, coupled
with limits on host galaxy colors (e.g. restframe U-V < 1.2), might
produce a better upper limit on the host brightness in J than will 10-14
hours of imaging with NIRI/ISSAC.
- Greg
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