From: Tony Spadafora (ALSpadafora@lbl.gov)
Date: Tue Jan 13 2004 - 11:53:32 PST
Hi Serena,
Here are my comments on your paper (sorry they're late.) I think this
is clearly written and quite interesting. I confess that I am still
not very familiar with this field, so my comments are mostly
suggestions or questions of a general nature. I hope they're of some
help to you.
General organization: It seems that the paper has three major parts:
a) analysis of nearby I-band data, b) 3 high z SNe i-band data, c)
analysis for gray dust, evolution. There is new SCP data presented in
b) on 2000fr, but some readers may not realize that because it is in
the middle of the paper and is not mentioned in the abstract or the
introduction. Offhand, I might have expected the a sequence:
introduction, observations of new data, comparison to previous data,
analysis. If we don't want to reorganize it (into separate papers??)
then I'd suggest a mention at the end of the introduction that there is
new data presented later.
Related to the new data on 2000fr, would anything be gained by
combining what we know from Knop et al R & I lightcurves, Garavini et
al spectra. to arrive at a comprehensive understanding of this SN? Does
it come out in the same relative position on the I band Hubble diagram
as it did for the B-band one? Is that fact that you fit it with 1992bc
and get Imax=23.35 consistent with what we know about this SN?
Sec 2: is there a physical motivation or understanding of why you can
fit B-template to I-band, or is it just empirical? If the latter, then
could other templates also do as well?
In the fitting procedure, I see that you fit for the top 5 parameters
in Table 1, but what is the method to obtain the lower set of (actual
Iband) parameters -so I know their exact definitions?
Sec 2.4: I would think that establishing a width-luminosity relation
in the i-band is a significant result for the field. Krisciunas states
there is no such relation for JHK. (see his recent astroph). You state
the result in sec 2.4 (and in the conclusions) but without much
attention. If this is an important result, wouldn't it need more
justification, included a thorough exploration of correlations of
various parameters. I was wondering about sB vs sI. ( I know you have
these on your web page, but should they be summarized here? ) I was
excited that you found such a relation, but then a little let down to
see you don't use this in sec 5 for the high z analysis, after all!
sec 4. Related to the discussion of KIJs, how about showing the values
in a table?
Regards,
-Tony
Tony Spadafora ALSpadafora@lbl.gov
Physics Division Tel: (510) 495-2316
Lawrence Berkeley National Lab FAX: (510) 486-6738
1 Cyclotron Road BLDG 50R5032
Berkeley, CA 94720-8160
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