Difference between revisions of "Specially processed maps"

From Planck PLA 2015 Wiki
Jump to: navigation, search
(→‎IRAM Maps of the Crab nebula)
(→‎Lensing map)
Line 5: Line 5:
  
 
== Lensing map ==
 
== Lensing map ==
−
=== Description ===
 
  
−
Here we present the minimum-variance (MV) lens reconstruction which forms the basis for the main results of {{PlanckPapers|planck2013-p12}}. This map is produced using a combination of the 143 and 217 GHz Planck maps on approximately 70% of the sky, and is the same map on which the Planck lensing likelihood is based.
+
We distribute the minimum-variance (MV) lensing potential estimate presented in {{PlanckPapers|planck2014-xxx}} as part of the 2014 data release. This map represents an estimate of the CMB lensing potential on approximately 70% of the sky, and also forms the basis for the Planck 2014 lensing likelihood. It is produced using filtered temperature and polarization data from the SMICA DX11 CMB map; its construction is discussed in detail in {{PlanckPapers|planck2014-xxx}}.
  
−
We distribute:
 
  
−
; PHIBAR : A (transfer-function convolved) map of the lensing potential, in NSIDE 2048 HEALPix RING format. It is obtained by convolving the lensing potential estimate <math>\hat{\phi}</math> with the lensing response function <math>R_L^{\phi\phi}</math>. This map has been band-limited between multipoles <math>10 \le L \le 2048</math>.
+
The estimate is contained in a single gzipped tarball named ''{{PLASingleFile|fileType=map|name=COM_CompMap_Lensing_2048_R0.00.tgz|link=COM_CompMap_Lensing_2048_R0.00.tgz}}''. Its contents are described below.
−
; MASK : This is a NSIDE = 2048 HEALPix map, containing the analysis mask used in the lens reconstruction. ''Note'': the lensing map PHIBAR may take small but non-zero values inside the masked regions because it has been bandlimited.
 
−
; RLPP : This column contains the response function <math>R_L^{\phi\phi}</math>.
 
−
; NLPP : This column contains a sky-averaged estimate of the noise power spectrum of PHIBAR, <math>N_L^{\phi\phi}</math>. The noise is highly coloured. There is a dependence of the noise power spectrum on the local noise level of the map, discussed in Appendix A of {{PlanckPapers|planck2013-p12}}. Note that the noise power spectrum estimate here is not sufficiently accurate for a power spectrum analysis.
 
−
 
 
−
Also, the table below gives the lensing curl-mode power spectrum data used to produce Figure A2 of {{PlanckPapers|planck2013-p12}}:
 
−
 
 
−
{| border="1" cellpadding="3" cellspacing="0" align="center" style="text-align:center"
 
−
|+ ''''MV' curl reconstruction bandpowers from Fig A2 of {{PlanckPapers|planck2013-p12}} '''
 
−
|-  bgcolor="ffdead" 
 
−
! <math>L</math><sub>min</sub> ||  <math>L</math><sub>max</sub> ||  <math>{\hat{C}_L}^{\psi\psi} (L(L+1))^2/(2\pi)</math> || <math> std({\hat{C}_L}^{\psi\psi})  (L(L+1))^2 /(2\pi)</math>
 
−
|-
 
−
|    2 ||    7 || -13.6379  || 15.3409
 
−
|-
 
−
|    8 ||  20 ||  6.0184  ||  4.8881
 
−
|-
 
−
|    21 ||  39 ||  -1.0675  ||  3.0940
 
−
|-
 
−
|    40 ||  65 ||  0.6135  ||  1.8474
 
−
|-
 
−
|    66 ||  100 ||  1.5030  ||  1.2696
 
−
|-
 
−
|  101 ||  144 ||  1.3760  ||  0.9950
 
−
|-
 
−
|  145 ||  198 ||  -1.2289  ||  0.8286
 
−
|-
 
−
|  199 ||  263 ||  1.1910  ||  0.7001
 
−
|-
 
−
|  264 ||  338 ||  -0.6567  ||  0.6197
 
−
|-
 
−
|  339 ||  425 ||  -0.8201  ||  0.5235
 
−
|-
 
−
|  426 ||  525 ||  -0.7581  ||  0.4850
 
−
|-
 
−
|  526 ||  637 ||  -0.3201  ||  0.5134
 
−
|-
 
−
|  638 ||  762 ||  -0.1589  ||  0.4073
 
−
|-
 
−
|  763 ||  901 ||  -0.6451  ||  0.4044
 
−
|-
 
−
|  902 || 1054 ||  0.4910  ||  0.3718
 
−
|-
 
−
|  1055 || 1221 ||  -0.2186  ||  0.3702
 
−
|-
 
−
|  1222 || 1404 ||  -0.3295  ||  0.4146
 
−
|-
 
−
|  1405 || 1602 ||  -0.3647  ||  0.4703
 
−
|-
 
−
|  1603 || 1816 ||  -0.1060  ||  0.5904
 
−
|-
 
−
|  1817 || 2020 ||  -0.7887  ||  0.8507
 
−
|}
 
−
 
 
−
=== Production process ===
 
−
 
 
−
The construction PHIBAR, RLPP and NLPP are described in detail in Sec. 2.1 of {{PlanckPapers|planck2013-p12}}. The response function <math>R_L^{\phi\phi}</math> here is analogous to the the beam transfer function in a CMB temperature or polarization map. We have chosen to distribute this transfer-function convolved map rather than the normalized lens reconstruction as it is a significantly more localized function of the CMB temperature map from which it is derived, and therefore more useful for cross-correlation studies.
 
−
 
 
−
===Inputs===
 
−
 
 
−
This product is built from the 143 and 217 GHz Planck [[Frequency Maps|frequency maps]], with 857GHz projected out as a dust template.
 
−
The analysis mask is constructed from a combination of thresholding in the 857GHz map (to remove the regions which are most contaminated by Galactic dust) and the [[CMB_and_astrophysical_component_maps#CO_emission_maps | Type2 CO map]] (to reduce contamination from CO lines at 217GHz). This is joined with a compact object mask synthesized from several Planck source [[Catalogues | catalogues]], including the [[ Catalogues#ERCSC | ERCSC]], [[ Catalogues#SZ | SZ ]] and [[ Catalogues#The Catalogue of Compact Sources | PCCS ]]. The reconstruction was performed using the fiducial beam window functions B(l) from the [[ The RIMO | HFI RIMO ]]. Details of the procedure used to produce a lensing estimate from these inputs are given in {{PlanckPapers|planck2013-p12}}.
 
−
 
 
−
===File names and format===
 
−
 
 
−
A single file named  
 
−
*''{{PLASingleFile|fileType=map|name=COM_CompMap_Lensing_2048_R1.10.fits|link=COM_CompMap_Lensing_2048_R1.10.fits}}''  
 
−
with two BINTABLE extensions containing the items described below.  
 
−
 
−
For illustration, we show in the figures below the maps of the Wiener-filtered CMB lensing potential in Galactic coordinates using orthographic projection. The reconstruction was bandpass filtered to <math>L \in [10, 2048]</math>. Note that the lensing reconstruction, while highly statistically significant, is still noise dominated for every individual mode, and is at best <math>S/N \simeq 0.7</math> around <math>L = 30</math>.
 
−
 
 
−
<center>
 
−
<gallery perrow=3 widths=260px heights=170px>
 
−
File: analysis_lens_pub_map_orth_north_dat_p.png | Galactic north
 
−
File: analysis_lens_pub_map_orth_south_dat_p.png | Galactic south
 
−
</gallery></center>
 
  
  
  
 
{| border="1" cellpadding="3" cellspacing="0" align="center" style="text-align:left"
 
{| border="1" cellpadding="3" cellspacing="0" align="center" style="text-align:left"
−
|+ '''FITS file structure'''
+
|+ ''' Contents of {{PLASingleFile|fileType=map|name=COM_CompMap_Lensing_2048_R0.00.tgz|link=COM_CompMap_Lensing_2048_R0.00.tgz}} '''
−
|- bgcolor="ffdead" 
 
−
!colspan="4" | 1. EXTNAME = ''LENS-MAP''
 
 
|-  bgcolor="ffdead"   
 
|-  bgcolor="ffdead"   
−
! Column Name || Data Type || Units || Description
+
! Filename || Format || Description
 
|-
 
|-
−
|PHIBAR || Real*4 || none || Map of the lensing potential estimate, convolved with RLPP
+
| dat_klm.fits || HEALPIX FITS format alm, with <math> L_{\rm  max} = 2048 </math> || Contains the estimated lensing convergence <math> \hat{\kappa}_{LM} = \frac{1}{2} L(L+1)\hat{\phi}_{LM} </math>.
 
|-
 
|-
−
|MASK || Int || none || Region over which the lensing potential is reconstructed
+
| mask.fits.gz || HEALPIX FITS format map, with <math> N_{\rm  side} = 2048 </math> || Contains the lens reconstruction analysis mask.
−
|- bgcolor="ffdead" 
 
−
! Keyword || Data Type || Value || Description
 
 
|-
 
|-
−
|PIXTYPE  ||  string || HEALPIX || colspan="2"|  
+
| nlkk.dat || ASCII text file, with columns = (<math>L</math>, <math>N_L </math>, <math>C_L+N_L</math>) || The approximate noise <math>N_L</math> (and signal+noise, <math>C_L+N_L</math>) power spectrum of <math> \hat{\kappa}_{LM} </math>, for the fiducial cosmology used in {{PlanckPapers|planck2014-xxx}}.
−
|-
 
−
|COORDSYS  ||  string || GALACTIC || Coordinate system
 
−
|-
 
−
|ORDERING  ||  string || NESTED  || Healpix ordering
 
−
|-
 
−
|NSIDE  || Int*4  ||  2048 ||colspan="2"| Healpix Nside
 
−
|-
 
−
|FIRSTPIX || Int*4  ||          0 ||
 
−
|-
 
−
|LASTPIX || Int*4  || 50331647 ||
 
−
|- bgcolor="ffdead" 
 
−
!colspan="4"| 2. EXTNAME = ''TransFun''
 
−
|-  bgcolor="ffdead" 
 
−
! Column Name || Data Type || Units || Description
 
−
|-
 
−
|RLPP || Real*4 || none || Response function
 
−
|-
 
−
|NLPP || Real*4 || none || Sky-averaged noise power spectrum estimate
 
−
|- bgcolor="ffdead" 
 
−
! Keyword || Data Type || Value || Description
 
−
|-
 
−
|L_MIN || Int*4  ||          0 || First multipole
 
−
|-
 
−
|L_MAX || Int*4  ||  2048 || Last multipole
 
 
|}
 
|}
−
 
  
 
== IRAM Maps of the Crab nebula ==
 
== IRAM Maps of the Crab nebula ==

Revision as of 20:52, 14 December 2014

Overview[edit]

This section describes products that require special processing. Only one such product is available at this time; this section will be expanded with time as more products are added.

Lensing map[edit]

We distribute the minimum-variance (MV) lensing potential estimate presented in [1] as part of the 2014 data release. This map represents an estimate of the CMB lensing potential on approximately 70% of the sky, and also forms the basis for the Planck 2014 lensing likelihood. It is produced using filtered temperature and polarization data from the SMICA DX11 CMB map; its construction is discussed in detail in [1].


The estimate is contained in a single gzipped tarball named COM_CompMap_Lensing_2048_R0.00.tgz. Its contents are described below.


Contents of COM_CompMap_Lensing_2048_R0.00.tgz
Filename Format Description
dat_klm.fits HEALPIX FITS format alm, with [math] L_{\rm max} = 2048 [/math] Contains the estimated lensing convergence [math] \hat{\kappa}_{LM} = \frac{1}{2} L(L+1)\hat{\phi}_{LM} [/math].
mask.fits.gz HEALPIX FITS format map, with [math] N_{\rm side} = 2048 [/math] Contains the lens reconstruction analysis mask.
nlkk.dat ASCII text file, with columns = ([math]L[/math], [math]N_L [/math], [math]C_L+N_L[/math]) The approximate noise [math]N_L[/math] (and signal+noise, [math]C_L+N_L[/math]) power spectrum of [math] \hat{\kappa}_{LM} [/math], for the fiducial cosmology used in [1].

IRAM Maps of the Crab nebula[edit]

Maps of the Crab nebula at 89.189 GHz (HCO+(1-0) transition) in both temperature and polarization, prodouced from observations performed at the IRAM 30m telescope from January 9th to January 12th 2009, are delivered as a tarball of 416 KB in the file

File:Crab IRAM 2010.zip

See README in the tarball for full details. These data were used in[2]

References[edit]

  1. ↑ 1.01.11.2
  2. ↑ Measurement of the Crab nebula polarization at 90 GHz as a calibrator for CMB experiments, J. Aumont, L. Conversi, C. Thum, H. Wiesemeyer, E. Falgarone, J. F. Macías-Pérez, F. Piacentini, E. Pointecouteau, N. Ponthieu, J. L. Puget, C. Rosset, J. A. Tauber, M. Tristram, A&A, 514, A70+, (2010).

Cosmic Microwave background

Flexible Image Transfer Specification

Retrieved from ‘https://wiki.cosmos.esa.int/planckpla2015/index.php?title=Specially_processed_maps&oldid=10099’