From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Fri May 16 2003 - 13:37:32 PDT
Hi Rob,
I agree that the ellipticals look as good as anything on the E(B-V)
versus stretch plot.
On Fri, 16 May 2003, Robert A. Knop Jr. wrote:
> On Fri, May 16, 2003 at 01:20:04PM -0700, Greg Aldering wrote:
>
> > Ok, grabbed b-v_snelist.lis from your webpage, and plotted the
> > residuals (which I assumed were in the last column) vs stretch for SNe
> > within 3 stretch-corrected days of max. What I see is that the
> > residuals of the ridgeline of points misses zero by about 0.02-0.03 mag.
> > There may be some higher-order effect as well, but that is harder
> > to say with confidence.
>
> Last column is E(B-V), yes.
>
> What do you mean when you say the residual of the ridgeline of points is
> missing? What is the diagnostic that you're using?
I am ploting E(B-V) versus stretch for SNe within 3 stretch-corrected
days of max. Them I am *visually* identifying clumps of SNe which seem
to have similar E(B-V) at similar stretches, or which seem to fit-in with
the trends those clumps exhibit.
After the snap meeting I can try to send you a plot.
Or you can run this snippet of IDL:
readcol,'b-v_snelist.lis',name,s,date,bmv,errbmv,resid,format='(a,f,f,f,x,f,f)'
w = where(abs(date/s) lt 3,nw)
plot,s[w],resid[w],psym=4,yrange=[-0.2,0.2]
oploterr,s[w],resid[w],errbmv[w]
> Of the HST SNe in the paper, when the reddest ones are thrown out (92ag
> and 93ag), the vairance weighted mean E(B-V) (based now on lightcurve
> fits) comes out at -0.004+-0.004. If the line moves any to the redder,
> we will have the "too blue Hamuy" supernovae problem again.
Right, I appreciate that is is a problem. I wonder why it is not apparent
in the plot (above) that I am making.
> I've attached a plot of E(B-V) vs. s. Again, these E(B-V) are the
> results of the snminuit fits, and thus not exactly the same thing as the
> numbers from b-v_snelist.lis (which is the E(B-V) value at the given day
> from the color curve, not from any sort of lightcurve). The ellipticals
> (the ones from the list you sent me) are the black points. This
> distribution looks pretty good to me.
Yes, this looks pretty good.
This archive was generated by hypermail 2.1.4 : Fri May 16 2003 - 13:37:34 PDT