From: Serena Nobili (serena@physto.se)
Date: Wed Mar 10 2004 - 04:51:23 PST
Dear Lifan,
as you have seen in the plot I sent attached in my previous email, the
K-corrections, both using my templates and Rob's, can be quite large,
ranging from about -0.3 to 0.1 mag (for z=0.05). Is this what you mean by
saying that your K-corrections are quite small, typically below 0.1 mag?
I look forward to seeing the results of your calculations next week.
Thank you for your help.
Cheers,
Serena
On Tue, 9 Mar 2004 LWang@lbl.gov wrote:
>Dear Serena,
>
> Thanks for the k-corrections. I have run a
>quick comparison and our k-corrections are indeed
>very different. I do not have time to resolve the
>reasons - this means mine could be wrong. The size
>of my k-corrections up to redshift z = 0.09 are all
>quite small, typically below 0.1 mag. I will have to
>do the calculations using your spectra to see what
>is going on. I will put that on the first thing to
>do when I get back next week from a meeting.
>
> Cheers,
>
>Lifan
>
>----- Original Message -----
>From: Serena Nobili <serena@physto.se>
>Date: Tuesday, March 9, 2004 4:06 am
>Subject: K-corrections
>
>>
>> Dear Lifan,
>>
>> given the disagreement you pointed out between
>your and my K-
>> correctionsit would be nice to try to find out
>what is going on.
>> As I recall it, you
>> said the differences were only above redshift
>0.07, is this
>> correct? I
>> send you as attachment K-corrections I computed
>using my spectral
>> templates (which you find in the Stockholm web page:
>>
>http://www.physto.se/~snova/private/templates/snflux_1a_serena.dat.gz
>) as
>> a function of time for some relevant redshift
>(z=0.01,0.05,0.08).
>> Also, it
>> would be nice to understand what spectra you are
>using for
>> computing the
>> K-corrections (perhaps we could start with a list
>of them).
>>
>> Meanwhile, can you provide me with a list of SNe
>that you have in the
>> Hubble diagram and their fitted Imax? This way I
>can check why I
>> seem to
>> get a larger dispersion than you.
>> Thank you for your help.
>> Cheers
>>
>> Serena
>>
>>
>> On Tue, 24 Feb 2004, Serena Nobili wrote:
>>
>> >
>> >2) Lifan computes different K-corrections than I.
>We should try to
>> > compare them and figure out why there are
>differences. Serena uses
>> > the spectral templates published in Nobili et
>al 2003. Lifan
>> uses a
>> > sample of nearby spectral templates for which
>he computes the
>> > K-corrs and average them out. Lifan will try
>to compare them.
>> > As Ariel pointed out, we would like to use
>templates for
>> computing
>> > K-corrections, as this is used for the high-z
>SNe, in order not to
>> > treat them differently.
>> >
>>
>>
>>
>>
>>
>>
>--------------------------------------------------------------------
>> --
>> www.physto.se/~serena
>> Tel +46 8 55378661
>>
>> Give free food at:
>> http://www.porloschicos.com/
>> http://www.thehungersite.com/
>>
>>
>>
>>
>
>
------------------------------------------------------------------------ www.physto.se/~serena Tel +46 8 55378661
Give free food at: http://www.porloschicos.com/ http://www.thehungersite.com/
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