Difference between revisions of "Specially processed maps"

Introduction

This section describes the products that required special processing.

2015 Lensing map

We distribute the minimum-variance (MV) lensing potential estimate presented in Planck-2015-A15[1] as part of the 2014 data release. This map represents an estimate of the 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 map; its construction is discussed in detail in Planck-2015-A09[2].

The estimate is contained in a single gzipped tarball named COM_CompMap_Lensing_2048_R2.00.tgz. Its contents are described below. The convergence map "dat_klm.fits" that can be found in the tarball, has been categorized as COM_Lensing-Convergence-dat-klm_2048_R2.00.fits in the Lensing Products section of the archive.

Contents of Lensing package
Filename Format Description
dat_klm.fits HEALPIX format alm, with $L_{\rm max} = 2048$ Contains the estimated lensing convergence $\hat{\kappa}_{LM} = \frac{1}{2} L(L+1)\hat{\phi}_{LM}$.
mask.fits.gz HEALPIX format map, with $N_{\rm side} = 2048$ Contains the lens reconstruction analysis mask.
nlkk.dat ASCII text file, with columns = ($L$, $N_L$, $C_L+N_L$) The approximate noise $N_L$ (and signal+noise, $C_L+N_L$) power spectrum of $\hat{\kappa}_{LM}$, for the fiducial cosmology used in Planck-2015-A13[3].

2015 Compton parameter map

We distribute here the Planck full mission Compton parameter maps (y-maps hereafter) obtained using the NILC and MILCA component separation algorithms as described in Planck-2015-A22[4]. We also provide the ILC weights per scale and per frequency that were used to produce these y-maps. IDL routines are also provide to allow the user to apply those weights. Compton parameters produced by keeping either the first or the second half of stable pointing periods are also provide and we call them FIRST and LAST y-maps. Additionally we construct a noise estimates of full mission Planck y-maps from the half difference of the FIRST and LAST y-maps. These estimates are used to construct standard deviation maps of the noise in the full mission Planck y-maps that are also provided. To complement this we also provide the power spectra of the noise estimate maps after correcting for inhomogeneities using the standard deviation maps. We also deliver foreground masks including point-source and galactic masks.

Update 04 Aug 2017: The file containing the masks named COM_CompMap_Compton-SZMap-masks_2048_R2.00.fits has been updated with the file COM_CompMap_Compton-SZMap-masks_2048_R2.01.fits. The difference between the two is that in the R2.00 version a region around the Galactic pole had been masked, while only the Galactic plane should be masked. This has been fixed in version R2.01. The full updated data set is contained in a single gzipped tarball named COM_CompMap_YSZ_R2.01.fits.tgz. The R2.00 version of the mask is not available in the anymore, but can be requested via the Helpdesk.

The contents of the full data set are described below.

Contents of COM_CompMap_YSZ_R2.01.fits.tgz
Filename Format Description
nilc_ymaps.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the NILC full mission, FIRST and LAST ymaps.
milca_ymaps.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the MILCA full mission, FIRST and LAST ymaps.
nilc_weights_BAND.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 128$ Contains the NILC ILC weights for the full mission ymap for band BAND 0 to 9. For each band we provide a weight map per frequency.
milca_FREQ_Csz.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the MILCA ILC weights for the full mission ymap for frequency FREQ (100,143,217,353,545,857). For each frequency we provide a weight map per filter band.
nilc_stddev.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the stddev map for the NILC full mission y-map.
milca_stddev.fits HEALPIX format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the stddev maps for the MILCA full mission ymap.
nilc_homnoise_spect.fits ASCII table format Contains the angular power spectrum of the homogeneous noise in the NILC full mission ymap.
milca_homnoise_spect.fits ASCII table format Contains the angular power spectrum of the homogeneous noise in the MILCA full mission ymap.
masks.fits HEALPIX format map, with $N_{\rm side} = 2048$ Contains foreground masks.
nilc_bands.fits ASCII table format Contains NILC wavelet bands in multipole space

2015 Lensing-induced B-mode map

We distribute the Planck map of the lensing-induced B-modes presented in Planck-2015-XLI[5]. The Stokes parameter maps of the lensing B-modes are produced by combining the lensing potential map extracted from the SMICA temperature map with E-mode data from the SMICA polarization maps. The SMICA temperature and polarization products are described in Planck-2015-A09[2]. The lensing-induced B-mode polarization maps are used in cross-correlation with the SMICA polarization maps to obtain a lensing B-mode power spectrum measurement from approximately 70% of the sky.

We provide both raw products, which can be utilized to generate products adapted to one's specific needs in term of mask, filtering, etc., and "ready-to-use" products for cross-correlation study purposes.

Raw products

We deliver the non-normalized lensing-induced Stokes parameter maps, labelled $\bar{Q}^{\rm{lens}}$ and $\bar{U}^{\rm{lens}}$, which form the basis of the final lensing B-mode estimator defined in equation (6) of the paper. They are defined as

$\begin{eqnarray} \bar Q^{\rm{lens}}({\bf n}) &=& \widetilde Q^{E}({\bf n}) \cdot \nabla \widetilde \phi({\bf n}), \\ \bar U^{\rm{lens}}({\bf n}) &=& \widetilde U^{E}({\bf n}) \cdot \nabla \widetilde \phi({\bf n}), \end{eqnarray}$

where $\widetilde Q^{E}$ and $\widetilde U^{E}$ are the filtered pure E-mode polarization maps given in equation (5), and $\widetilde \phi$ is the filtered lensing potential estimate.

We also provide the normalization transfer function $\mathcal{B}_\ell$ defined in equation (12), as well as the "B70" mask $M({\bf n})$ that retains 69% of the sky before apodization, and its apodized version $\tilde{M}({\bf n})$, which has an effective sky fraction $f_{\rm{sky}}^{\rm{eff}} = 65\%$.

As an example of the utilization of these products, the lensing B-mode maps that are shown in figure 4 are generated from

$Q^{\rm{lens}} \pm i U^{\rm{lens}} = \sum_{\ell m} \left( G_\ell \mathcal{B}_\ell^{-1} \int d{\bf n} {\, }_{\pm 2}Y_{\ell m}^*({\bf n}) \left(\bar{Q}^{\rm{lens}} \pm i \bar{U}^{\rm{lens}} \right) \right) {\, }_{\pm 2}Y_{\ell m}({\bf n})$,

where $G_\ell$ is a Gaussian filter of 60 arcmin (introduced for highlighting large angular scales, although it can be removed or replaced by any other filter). This can be practically done by ingesting $\bar{Q}^{\rm{lens}}$ and $\bar{U}^{\rm{lens}}$ in the "smoothing" routine, and using the product $G_\ell\mathcal{B}_\ell^{-1}$ as an input filtering function.

The lensing-induced Stokes parameter maps are provided without being masked for the user's convenience (in particular, it allows for various filtering to be tested). However, whenever they are utilized in view of obtaining scientific outcomes, they should be masked using the B70 mask, which is also provided.

Specific products

We provide the lensing B-mode spherical harmonic coefficient estimate $B_{\ell m}^{\rm{lens}}$ over approximately 70% of the sky.

It can also be constructed using the raw products described above from

$B_{\ell m}^{\rm{lens}} = f_{10 \rightarrow 2000} \, \mathcal{B}_\ell^{-1} \, \, {\, }_{\pm 2}\mathcal{Y} \left[ \tilde{M}({\bf n}) \left( \bar{Q}^{\rm{lens}}({\bf n}) \pm i \bar{U}^{\rm{lens}}({\bf n}) \right) \right]$,

where $f_{10 \rightarrow 2000}$ is a band-pass filter that retain the multipole range $10 \le \ell \le 2000$, and ${\, }_{\pm2}\mathcal{Y}$ is a short-hand notation for transforming a map into spin-weighted spherical harmonic coefficients ${\, }_{+2}a_{\ell m}$, ${\, }_{-2}a_{\ell m}$ and forming $1/(2i)\left({\, }_{+2}a_{\ell m} - {\, }_{-2}a_{\ell m}\right)$. This can be done using, e.g., the "anafast" tool.

The lensing B-mode power spectrum estimate $\hat{C}_\ell^{BB^{\rm{lens}}}$ is obtained by forming the cross-correlation power spectrum of $B_{\ell m}^{\rm{lens}}$ and the B-mode data from the SMICA polarization maps $B_{\ell m}$:

$\hat{C}_\ell^{BB^{\rm{lens}}} = \frac{\left(f_{\rm{sky}}^{\rm{eff}}\right)^{-1}}{2 \ell +1} G_\ell^{-2} \sum_m B_{\ell m}^* B_{\ell m}^{\rm{lens}}$,

where $G_\ell$ is the 5 arcmin Gaussian beam that convolves the SMICA maps.

The products are contained in a single gzipped tarball named COM_Lensing-Bmode_R2.01.tgz. Its contents are described below.

Contents of Lensing B-mode package
Filename Format Description
bar_q_lens_map.fits format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the non-normalized lensing-induced Q Stokes parameter map $\bar Q^{\rm{lens}}({\bf n})$.
bar_u_lens_map.fits format map in Galactic coordinates with $N_{\rm side} = 2048$ Contains the non-normalized lensing-induced U Stokes parameter map $\bar U^{\rm{lens}}({\bf n})$.
mask.fits format map in Galactic coordinates with $N_{\rm side} = 2048$ The B70 mask (apodized version).
mask_noapo.fits format map in Galactic coordinates with $N_{\rm side} = 2048$ The B70 mask without apodization.
transfer_function_b_l.dat ASCII text file, with columns = ($\ell$, $\mathcal{B}_\ell$) The transfer function of the lensing B-mode estimator.
lensing_bmode_b_lm.fits format alm, with $\ell_{\rm max} = 2000$ Contains the lensing B-mode harmonic coefficients $B_{\ell m}^{\rm{lens}}$.
lensing_bmode_bandpowers.dat ASCII text file, with columns = ($\ell_{\rm min}$, $\ell_{\rm b}$, $\ell_{\rm max}$, $\hat{C}_{\ell_{\rm b}}^{BB^{\rm{lens}}}$, $\Delta \hat{C}_{\ell_{\rm b}}^{BB^{\rm{lens}}}$ ) The lensing B-mode bandpower estimate on approximativily 70% of the sky and over the multipole range from 10 to 2000 shown in figure 10 of Planck-2015-XLI[5] (for plotting purposes only).

2015 Integrated Sachs-Wolfe effect map

We distribute estimates of the integrated Sachs-Wolfe (ISW) maps presented in Planck-2015-A21[6] as part of the 2015 data release. These map represents an estimate of the ISW anisotropies using different data sets:

• SEVEM DX11 map, together with all the large-scale structure tracers considered in the ISW paper, namely: NVSS, SDSS, WISE, and the Planck lensing map
• Using only the large-scale structure tracers mentioned above
• SEVEM DX11 map, together with NVSS and the Planck lensing maps (since these two tracers capture most of the information, as compared to SDSS and WISE)

For all the three cases, the reconstruction is provided on approximately 85% of the sky, and they are produced using the LCB filter described in the Planck ISW paper (Section 5), described in detail in Barreiro et al. 2008 and Bonavera et al. 2016.

These ISW maps, together with their corresponding uncertainties maps and masks, are given in a single file named COM_CompMap_ISW_0064_R2.00.fits. Its contents are described below.

Contents of the ISW maps file: COM_CompMap_ISW_0064_R2.00.fits
Extension Format Description Used data sets
0 format map with three components, $N_{\rm side}=64$, Ordering='Nest' Contains three components: i) ISW map [Kelvin], ii) Error map [Kelvin], iii) Mask map SEVEM DX11 + NVSS + SDSS + WISE + Planck lensing.
1 format map with three components, $N_{\rm side}=64$, Ordering='Nest' Contains three components: i) ISW map [Kelvin], ii) Error map [Kelvin], iii) Mask map NVSS + SDSS + WISE + Planck lensing.
2 format map with three components, $N_{\rm side}=64$, Ordering='Nest' Contains three components: i) ISW map [Kelvin], ii) Error map [Kelvin], iii) Mask map SEVEM DX11 + NVSS + Planck lensing.

References

1. Planck 2015 results. XV. Gravitational Lensing, Planck Collaboration, 2016, A&A, 594, A15.
2. Planck 2015 results. XI. Diffuse component separation: CMB maps, Planck Collaboration, 2016, A&A, 594, A9.
3. Planck 2015 results. XIII. Cosmological parameters, Planck Collaboration, 2016, A&A, 594, A13.
4. Planck 2015 results. XXII. A map of the thermal Sunyaev-Zeldovich effect, Planck Collaboration, 2016, A&A, 594, A22.
5. Planck intermediate results. XLI. A map of lensing-induced B-modes, Planck Collaboration Int. XLI A&A, 596, A102, (2016).
6. Planck 2015 results. XXI. The integrated Sachs-Wolfe effect, Planck Collaboration, 2016, A&A, 594, A21.