Hi John,
I think there is enough confusion with what I've done for the
amplitude of the Planck Pol Frac that we should ignore it until I sort
some things out offline. I've put a note in my posting saying as much.
you did the standard convertion from antenna (uK_RJ) to thermodynamic
No, I probably haven't done this properly, partly because (as Sergi
mentioned), the map I started with was in MJy/sr.
-Jamie
On Tue, May 7, 2013 at 7:30 AM, John Kovac <jmkovac(a)cfa.harvard.edu> wrote:
Hi Jamie,
On your cross-spectra pager, why do the B_f X
B_B curves for
PSM_Dust, PSM_Dust_sim, and FDS_Dust all look
nearly identical?
If you look closely, you can tell that the plots are not numerically
identical, so I don't think I have a plotting error. That being said,
they are remarkably similar. I'll look into this more.
Yes, I did look closely and that is what I saw. Thank you for checking it
out.
- Aren't Planck's 353 GHz maps in uK_cmb? Did you convert to uK_RJ
before applying your nu^2 scaling? The
Aumont ESLAB talk states:
"Dust polarization frequency dependence follows accurately a
modified blackbody with β = 1.6 and T = 19.6 K". We will need to
get this right for the real Planck 353 GHz data, so the scaling is
worth doing carefully.
It is true that I have not been as careful with the frequency scaling
as we might like. Equation 1 in this paper (arXiv:1303.5072v1) shows us
how to do this this, however, when I asked Sergi about this, he said
that what we needed to do this not publicly unavailable.
I'm not sure what Sergi means, but my main question was whether you did
the standard convertion from antenna (uK_RJ) to thermodynamic (uK_cmb)
units before applying your nu^2 scaling. That is a very large factor (I
get 7.4 for 353 vs 150), and it is suppressed in Eq 1 in the Planck
component separation paper. You don't mention this. Could you confirm?
cheers,
John
--
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John Kovac jmkovac(a)cfa.harvard.edu
Assistant Professor, Astronomy and Physics, Harvard University
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