Data model: wisconsin_pca
General description: This file contains the plate merged output of the Wisconsin PCA computation of the BOSS galaxy product, according to the
algorithm documentation.
Naming convention: wisconsin_pca-RUN2D.fits
Approximate size: 100 Mbytes.
File type: FITS
Read by products: galaxy/wisconsin_pca
Written by products: galaxy/wisconsin_pca
File Contents:
- HDU 0: NULL - Empty
- HDU 1: fields - Binary FITS Table, Object PCA
FITS Header Keywords (HDU 1):
- AUTHOR: File Authors
- VERSIDL: Version of IDL
- VERSUTIL: Version of idlutils
- VERS2D: Version of idlspec2d for 2D reduction
- VERS1D: Version of idlspec2d for 1D reduction
- VERSGAL: Version of GALAXY product
- VERSDUST: Version of DUST product
HDU 1 Binary FITS Table fields:
- PLATE (LONG): Plate number
- MJD (LONG): Modified Julian date of observation
- FIBERID (LONG): Fiber ID (1 to 1000)
- RA (DOUBLE): Object RA (Plug_RA drilled fiber position) [J2000 degrees]
- Dec (DOUBLE): Object Dec (Plug_Dec drilled fiber position) [J2000 degrees]
- z (FLOAT): Redshift (best pipeline galaxy z_noqso with zwarning_noqso=0)
- z_err (FLOAT): Redshift error (z_err_noqso) based upon fit to chi^2 minimum
- znum (LONG): the znum-th best-fit corresponding to z_noqso (optional input to readspec)
- MSTELLAR_MEDIAN (DOUBLE): 50 percentile of the PDF of Log(stellar mass), we take this as our best estimation
- MSTELLAR_ERR (DOUBLE): Computed as (MSTELLAR_P84 − MSTELLAR_P16) as the ±1σ error of Log(stellar mass)
- MSTELLAR_P2P5 (DOUBLE): 2.5 percentile of the PDF of Log(stellar mass)
- MSTELLAR_P16 (DOUBLE): 16 percentile of the PDF of Log(stellar mass)
- MSTELLAR_P84 (DOUBLE): 84 percentile of the PDF of Log(stellar mass)
- MSTELLAR_P97P5 (DOUBLE): 97.5 percentile of the PDF of Log(stellar mass)
- VDISP_MEDIAN (DOUBLE): 50 percentile of the PDF of stellar velocity dispersion, we take this as our best estimation
- VDISP_ERR (DOUBLE): Computed as (VDISP_P84 − VDISP_P16) as the ±1σ error of stellar velocity dispersion
- VDISP_P2P5 (DOUBLE): 2.5 percentile of the PDF of stellar velocity dispersion
- VDISP_P16 (DOUBLE): 16 percentile of the PDF of stellar velocity dispersion
- VDISP_P84 (DOUBLE): 84 percentile of the PDF of stellar velocity dispersion
- VDISP_P97P5 (DOUBLE): 97.5 percentile of the PDF of stellar velocity dispersion
- CALPHA (FLOAT[7]): The 7 coefficients projected over the 7 eigenspectra=[E1, E2, ..., E7]
- CALPHA_NORM (FLOAT): The normalization for reconstructing the best fit:
| spectrum = CALPHA_NORM * (CALPHA[0]*E1 + CALPHA[1]*E2 + CALPHA[2]*E3 + CALPHA[3]*E4 + ... + CALPHA[6]*E7) |
| WARNING=0: | These results correspond to a best-fit PCA spectrum, |
| WARNING>0: | No best-fit PCA spectrum computed, with individual reasons given by: |
| WARNING=1: | Target redshift too small (z < 0.05) |
| WARNING=2: | Target redshift too large (z > 0.8) |
| WARNING=3: | READSPEC cannot find wave |
| WARNING=4: | Wavelengths outside covariance matrix coverage |
| WARNING=5: | Unable to select projection wavelength range |
| WARNING=6: | Unable to project selected wavelength range |
| WARNING=7: | minimum chi2 < 0 |
| WARNING=8: | TOTAL(pdf_mass)=0 |
| WARNING=9: | TOTAL(pdf_vdisp)=0 |
- BOSS_TARGET1 (LONG64): See BOSS_TARGET
- ANCILLARY_TARGET1 (LONG64): See ANCILLARY_TARGET
- ANCILLARY_TARGET2 (LONG64): See ANCILLARY_TARGET
- SPECPRIMARY (BYTE): Objects observed multiple times will have this set to 1 for one observation only. This is usually the 'best'.
- SPECOBJID (LONG64): CAS-style spectroscopic object identifier.