================ delta_attributes ================ :Summary: This file contains auxiliar output from the picca delta extraction: summary statistics of the computed deltas. :Naming Convention: ``delta_attributes.fits.gz`` or ``delta_attributes_iterationITERATION.fits.gz``, where ``ITERATION`` is the iteration step. :Regex: ``delta_attributes(_iteration[0-9]+)?\.fits\.gz`` :File Type: FITS Contents ======== ====== ============ ======== ======================== Number EXTNAME Type Contents ====== ============ ======== ======================== HDU0_ PRIMARY PRIMARY Empty HDU1_ STACK_DELTAS BINTABLE Delta mean properties HDU2_ VAR_FUNC BINTABLE Variance fitted functions HDU3_ CONT BINTABLE Mean quasar continuum HDU4_ FIT_METADATA BINTABLE Extra fit metadata ====== ============ ======== ======================== FITS Header Units ================= HDU0 ---- This HDU has no non-standard required keywords. Empty HDU. HDU1 ---- EXTNAME = STACK_DELTAS Delta mean properties Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 24 int table width NAXIS2 2716 int number of wavelenght pixels FITORDER 1 int order of the fit CHECKSUM UaQGWRQDUXQDUXQD str HDU checksum updated 2023-05-20T00:44:43 DATASUM 288651377 str data unit checksum updated 2023-05-20T00:44:43 ============= ================ ===== =========================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==================== ======== ============= =================== Name Type Units Description ==================== ======== ============= =================== LOGLAM float64 log(Angstrom) log(wavelength) STACK float64 mean(1+delta) WEIGHT float64 Mean weight ==================== ======== ============= =================== HDU2 ---- EXTNAME = VAR_FUNC Variance fitted functions Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 48 int table width NAXIS2 20 int number of wavelenght pixels CHECKSUM 9l7aGj7V9j7ZGj7Z str HDU checksum updated 2023-05-20T00:44:43 DATASUM 2321635470 str data unit checksum updated 2023-05-20T00:44:43 ============= ================ ===== =========================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==================== ======== ============= =================== Name Type Units Description ==================== ======== ============= =================== LOGLAM float64 log(Angstrom) log(wavelength) ETA float64 Intrinsic variace of fluctuations VAR_LSS float64 Mean weight FUDGE float64 ad-hoc term correcting varianc of high SNR quas NUM_PIXELS int32 Number of pixels in the fit VALID_FIT logical Indicates valid fit ==================== ======== ============= =================== HDU3 ---- EXTNAME = CONT Mean quasar continuum Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 84 int table width NAXIS2 206 int number of rest-frame pixels CHECKSUM nadFnWaFnaaFnUaF str HDU checksum updated 2023-05-20T00:44:43 DATASUM 2310375264 str data unit checksum updated 2023-05-20T00:44:43 ============= ================ ===== =========================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==================== ======== ============================ =================== Name Type Units Description ==================== ======== ============================ =================== LOGLAM_REST float64 log(Angstrom) Logarithm of the rest-frame wavelength MEAN_CONT float64 10**-17 erg/(s cm2 Angstrom) Mean quasar continuum WEIGHT float64 mean weight ==================== ======== ============================ =================== HDU4 ---- EXTNAME = FIT_METADATA Mean quasar continuum Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 43 int table width NAXIS2 23168 int number of forests CHECKSUM WIaqZHaoWHaoWHao str HDU checksum updated 2023-05-20T00:44:43 DATASUM 179646866 str data unit checksum updated 2023-05-20T00:44:43 ============= ================ ===== =========================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==================== ======== ====== =================== Name Type Units Description ==================== ======== ====== =================== LOS_ID int64 PICCA unique target ID ZERO_POINT float64 Continuum zero-point paramter SLOPE float64 Continuum slope parameter CHI2 float64 Continuum fit chi2 NUM_DATAPOINTS int64 Number of wavelenth pixels ACCEPTED_FIT logical Fit acceptance ==================== ======== ====== =================== Notes and Examples ================== These files are generated with https://github.com/igmhub/picca/blob/master/bin/picca_delta_extraction.py The code was run twice: .. code-block:: bash picca_delta_extraction.py config/delta_extraction_ciii_step_1.ini picca_delta_extraction.py config/delta_extraction_lya.ini