From: Alexander Conley (AJConley@lbl.gov)
Date: Mon Aug 23 2004 - 17:00:28 PDT
Hi Chris,
Thanks for reading the draft so quickly.
I'll respond to your more substantive comments, and try to
get the improvements you suggest into the text as quickly as
possible:
Section 4, 2nd comment (B and V at different times) :
This turned out to be much less of an issue than I thought. I
required that
the B and V data points be within 0.1 days of each other. In order to
get
more points I had to loosen the requirement to 7 days. It appears
that,
at least for this data set, people never took a rest frame V
observation
except right after a rest frame B observation. I know that this is
not the
case for our latest ACS observations.
Section 5: CMAG relations at high redshift
I didn't actually use the goodness of fit critereon here, or require
that the
SNe have more than 2 points. I should have explained this better, but
the real requirement is npoints > 2, sigma_beta < 0.5. SN2000fr,
believe it or not, does NOT meet this requirement -- it's slope is
rather poorly measured (sigma_beta = 0.66). I felt that SNe with
very poorly measured slopes don't really contribute to the discussion.
Section 6.1: Dispersion
I was actually doing my best to not compare dispersions. I think
that this
issue is a quagmire, and am really hoping to avoid it. Lifan is
working on
a paper where he talks about this a lot.
Section 8 : Slope fit to dispersions
The S = 0.7 value is ignoring errors. Including the errors is a
little scary
because they are presumably rather correlated -- but you are probably
right, I should at least try to do something with them.
Section 8: npointsmin > 1
The shift is mostly along the long axis (Omega_2), by about 1/4 sigma,
but there is also a component along the short axis of about 1/6
sigma.
In the normal fit, Omega_1 = 0.09 +- 0.11 , Omega_2 = 1.48 +- 0.81
With npointsmin 2, Omega_1 = 0.11 +- 0.12, Omega_2 = 1.66 +- 0.97
Other points: s_b = s_v
This is an ugly issue. The short answer is that it doesn't matter
for the
CMAGIC fits, but plays a slighly larger role in the maximum magnitude
fits. In either case it isn't a big difference. I feel compelled to
do it the
way that I did because if you believe in CMAGIC you also are forced to
acknowledge that s_B != s_V for all SNe. But I should certainly try to
clarify that it doesn't really affect the result.
Alex
On Aug 23, 2004, at 3:10 PM, Chris Lidman wrote:
> Dear Alex,
> First of all, congratulations. You have done an excellent job, and I
> appreciate all the effort that have made in documenting your work.
>
> My comments are mostly of a minor nature.
>
> For the SCP exec.: I am comfortable with taking off the blind.
>
> Regards, Chris.
>
>
> --
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> Alonso de Córdova 3107, Vitacura
> Casilla 19001, Santiago 19
> CHILE
>
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> <comments_23082004.txt>
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