Difference between revisions of "The RIMO"
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== Detector-level parameter data == | == Detector-level parameter data == | ||
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The basic structure of the BINTABLE extension is as follows: | The basic structure of the BINTABLE extension is as follows: | ||
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== Map-level parameter data == | == Map-level parameter data == | ||
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; ''FREQUENCY'' : a 3-digit string giving the reference frequency in GHz, i.e., of the form ''044'' or ''217'' | ; ''FREQUENCY'' : a 3-digit string giving the reference frequency in GHz, i.e., of the form ''044'' or ''217'' | ||
; ''Omega_total'': total beam solid angle in armin^2 | ; ''Omega_total'': total beam solid angle in armin^2 | ||
| − | ; '' | + | ; ''Omega_1fwhm'' : beam solid angle out to 1FWHM in arcmin^2 |
; ''Omega_2fwhm'' : beam solid angle out to 2FWHM in arcmin^2 | ; ''Omega_2fwhm'' : beam solid angle out to 2FWHM in arcmin^2 | ||
; ''FWHM_eff'' : FWHM of a Gaussian beam having the same (total) solid angle, in sr. This is the best value for source flux determination | ; ''FWHM_eff'' : FWHM of a Gaussian beam having the same (total) solid angle, in sr. This is the best value for source flux determination | ||
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The BINTABLE extension has the following structure | The BINTABLE extension has the following structure | ||
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| − | + | == Effective band transmission profiles == | |
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| − | + | The effective filter bandpasses are given in different BINTABLE extensions. The extension is named ''BANDPASS_{name}'', where ''name'' specified the frequency channel. In the case of the maps, the bandpasses are a weighted average of the bandpasses of the detectors that are used to build the map. For details see <cite>#planck2013-p03d</cite>. The bandpasses are given as 4-column tables containing: | |
| − | The effective filter bandpasses are given in different BINTABLE extensions. The extension is named ''BANDPASS_{name}'', where ''name'' specified the | ||
; ''WAVENUMBER'' : the wavenumber in cm-1, conversion to GHz is accomplished by multiplying by <math>10^{-7}c</math> [mks]. | ; ''WAVENUMBER'' : the wavenumber in cm-1, conversion to GHz is accomplished by multiplying by <math>10^{-7}c</math> [mks]. | ||
; ''TRANSMISSION'' : the transmission (normalized to 1 at the max for HFI and to have an integral of 1 for LFI) | ; ''TRANSMISSION'' : the transmission (normalized to 1 at the max for HFI and to have an integral of 1 for LFI) | ||
| − | ; ''ERROR'' : the statistical <math>1-\sigma</math> uncertainty for the | + | ; ''ERROR'' : the statistical <math>1-\sigma</math> uncertainty for the transmission profile (not provided for LFI). |
| − | ; ''FLAG'' : a flag indicating if the data point is an | + | ; ''FLAG'' : a flag indicating if the data point is an independent frequency data point (nominally the case), or an FTS instrument line shape (ILS)-interpolated data point. The frequency data has been over-sampled by a factor of ~10 to assist in CO component separation efforts <cite>#planck2013-p03a, #planck2013-p03d</cite>. |
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| + | The number of rows will differ among the different extensions, but are the same, by construction, within each extension. | ||
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== Detector noise spectra == | == Detector noise spectra == | ||
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The noise power spectra are the result of the ''detnoise'' pipeline. | The noise power spectra are the result of the ''detnoise'' pipeline. | ||
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The keyword ''F_NYQ'' gives the Nyquist frequency, and can be used together with the number of points in the spectrum to reconstruct the frequency scale. The BINTABLE has the following structure: | The keyword ''F_NYQ'' gives the Nyquist frequency, and can be used together with the number of points in the spectrum to reconstruct the frequency scale. The BINTABLE has the following structure: | ||
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== Beam Window Functions == | == Beam Window Functions == | ||
| − | Beam window functions and associated error descriptions are | + | Beam window functions and associated error descriptions are written into a BINTABLE for each ''detection unit'', where ''detection unit'' consists of an auto or a cross product of one or two frequency maps or detset maps used in the likelihood. Here they are: |
* the 6 HFI frequency channels, producing 21 extensions | * the 6 HFI frequency channels, producing 21 extensions | ||
| + | ** 100, 143, 217, 353, 545, 857 | ||
* 26 detsets, producing 351 extensions; the detsets used are, by frequency channel: | * 26 detsets, producing 351 extensions; the detsets used are, by frequency channel: | ||
| − | ** | + | ** 100-DS1, 100-DS2, |
| − | ** | + | ** 143-DS1, 143-DS2, 143-5, 143-6, 143-7, |
| − | ** | + | ** 217-DS1, 217-DS2, 217-1, 217-2, 217-3, 217-4, |
| − | ** | + | ** 353-DS1, 353-DS2, 353-1, 353-2, 353-7, 353-8, |
| − | ** | + | ** 545-1, 545-2, 545-4, |
| − | ** | + | ** 857-1, 857-2, 857-3, 857-4 |
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| + | and the extension names are of the form | ||
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| + | BEAM_''U1''X''U2'' | ||
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| + | where U1 and U2 are one (possibly the same) detection unit from the list above. | ||
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Each extension contains: | Each extension contains: | ||
| − | * a ''NOMINAL'' column ( | + | * a ''NOMINAL'' column (Real*4) with the window function proper, |
| − | * | + | * five ''EIGEN_n'' columns (Real*4), of error modes. |
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* a keyword ''NUMVECT'' (Integer) specified the number of eigenmode vectors, and | * a keyword ''NUMVECT'' (Integer) specified the number of eigenmode vectors, and | ||
* keywords ''LMIN'' and ''LMAX'' which give the length of nominal vector | * keywords ''LMIN'' and ''LMAX'' which give the length of nominal vector | ||
* keywords ''LMIN_EM'' and ''LMAX_EM'' that give the range of the valid samples of the eigenmode vectors. Here ''LMAX_EM'' is always less than or equal to ''LMAX'', and the values between ''LMAX_EM''+1 and LMAX is set to NaN | * keywords ''LMIN_EM'' and ''LMAX_EM'' that give the range of the valid samples of the eigenmode vectors. Here ''LMAX_EM'' is always less than or equal to ''LMAX'', and the values between ''LMAX_EM''+1 and LMAX is set to NaN | ||
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An example of the FITS header is <span style="color:red">(Preliminary - to be updated)</span>: | An example of the FITS header is <span style="color:red">(Preliminary - to be updated)</span>: | ||
Revision as of 11:43, 6 March 2013
Overview[edit]
The RIMO, or Reduced Instrument Model is a FITS file containing selected instrument characteristics that are needed by users who work with the released data products. It is described in detail in The HFI and LFI RIMO ICD (ref). There will be two RIMOs, one for each instrument, which will follow the same overall structure, but will differ in the details. The type of data in the RIMO can be:
- Parameter
- namely scalars to give properties such as a noise level or a representative beam FWHM
- Table
- to give, e.g., filter transmission profiles or noise power spectra
- Map
- namely 2-D "flat" maps, to give, e.g., the main beam shape
The different types of data are written into different BINTABLE extensions of the FITS file, and these are described below.
Map-level parameter data[edit]
The map-level data table contains the effective beam solid angle (total and out to different multiples of the beamFWHM) and noise information as follows:
- FREQUENCY
- a 3-digit string giving the reference frequency in GHz, i.e., of the form 044 or 217
- Omega_total
- total beam solid angle in armin^2
- Omega_1fwhm
- beam solid angle out to 1FWHM in arcmin^2
- Omega_2fwhm
- beam solid angle out to 2FWHM in arcmin^2
- FWHM_eff
- FWHM of a Gaussian beam having the same (total) solid angle, in sr. This is the best value for source flux determination
- FWHM_gauss
- FWHM derived from best Gaussian fit to beam maps, in sr. This is the best value for source identification
- NOISE
- This is the typical noise/valid observation sample as derived from an appropriate combination of the NETs of the valid detectors used in the map.
For the Omega columns, the 'DISP' (for dispersion) column gives an estimate of the spatial variation as a function of position on the sky. This is the variation induced by combining the scanning beam determined from the planet observations with the scanning strategy, as described in Detectors pointing & beam.
The BINTABLE extension has the following structure
Effective band transmission profiles[edit]
The effective filter bandpasses are given in different BINTABLE extensions. The extension is named BANDPASS_{name}, where name specified the frequency channel. In the case of the maps, the bandpasses are a weighted average of the bandpasses of the detectors that are used to build the map. For details see #planck2013-p03d. The bandpasses are given as 4-column tables containing:
- WAVENUMBER
- the wavenumber in cm-1, conversion to GHz is accomplished by multiplying by [mks].
- TRANSMISSION
- the transmission (normalized to 1 at the max for HFI and to have an integral of 1 for LFI)
- ERROR
- the statistical uncertainty for the transmission profile (not provided for LFI).
- FLAG
- a flag indicating if the data point is an independent frequency data point (nominally the case), or an FTS instrument line shape (ILS)-interpolated data point. The frequency data has been over-sampled by a factor of ~10 to assist in CO component separation efforts #planck2013-p03a, #planck2013-p03d.
The number of rows will differ among the different extensions, but are the same, by construction, within each extension.
reduced IMO
Flexible Image Transfer Specification
(Planck) High Frequency Instrument
(Planck) Low Frequency Instrument
Interface Control Document
Full-Width-at-Half-Maximum
Instrument Line Shape
