============= delta-HEALPIX ============= :Summary: This file contains the main output from the picca delta extraction: the lyman alpha transmission fluctuations for all analysed quasars in a given healpix :Naming Convention: ``delta-HEALPIX.fits``, where ``HEALPIX`` is the healpix id. :Regex: ``delta-[0-9]+\.fits\.gz`` :File Type: FITS Contents ======== ====== =========== ======== ======================== Number EXTNAME Type Contents ====== =========== ======== ======================== HDU0_ PRIMARY PRIMARY Empty HDU1_ LAMBDA IMAGE Wavelength grid HDU2_ METADATA BINTABLE Per forest metadata HDU3_ DELTA IMAGE Flux transmission field HDU4_ WEIGHT IMAGE Weights HDU5_ CONT IMAGE Quasar continua ====== =========== ======== ======================== FITS Header Units ================= HDU0 ---- This HDU has no non-standard required keywords. Empty HDU. HDU1 ---- EXTNAME = LAMBDA Wavelength grid Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 2716 int number of wavelength pixels WAVE_SOLUTION lin str chosen wavelength solution DELTA_LAMBDA 0.8 float pixel step BUNIT Angstrom str wavelength units CHECKSUM UZ3aaZ2aVZ2aaZ2a str HDU checksum DATASUM 1634060384 str HDU data checksum ============= ================ ===== =========================== Data: FITS image [float64, 2716] HDU2 ---- EXTNAME = METADATA Per-forest metadata Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ======== =========================== KEY Example Value Type Comment ============= ================ ======== =========================== NAXIS1 84 int table width NAXIS2 340 int number of forests BLINDING none str blinding scheme used CHECKSUM UZ3aaZ2aVZ2aaZ2a str HDU checksum DATASUM 1634060384 str HDU data checksum ============= ================ ======== =========================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ==================== ======== ===== =================== Name Type Units Description ==================== ======== ===== =================== LOS_ID int64 PICCA unique target ID RA float64 rad Target Right Ascension [radians] DEC float64 rad Target declination [radians] Z float64 Redshift MEANSNR float64 mean signal-to-noise ratio TARGETID int64 Unique target ID NIGHT char[12] Observation night(s) PETAL char[12] Observation petal(s) TILE char[12] Observation tile(s) ==================== ======== ===== =================== HDU3 ---- EXTNAME = DELTA Flux transmission field in wavelength bins Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 2716 int number of wavelength pixels NAXIS2 340 int number of forests BUNIT str delta units (unitless) CHECKSUM UZ3aaZ2aVZ2aaZ2a str HDU checksum DATASUM 1634060384 str HDU data checksum ============= ================ ===== =========================== Data: FITS image [float64, 2716x340] HDU4 ---- EXTNAME = WEIGHT Weights in wavelength bins Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ================ ===== =========================== KEY Example Value Type Comment ============= ================ ===== =========================== NAXIS1 2716 int number of wavelength pixels NAXIS2 340 int number of forests CHECKSUM UZ3aaZ2aVZ2aaZ2a str HDU checksum DATASUM 1634060384 str HDU data checksum ============= ================ ===== =========================== Data: FITS image [float64, 2716x340] HDU5 ---- EXTNAME = CONT Quasar continuum in wavelength bins Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ============= ============================== ===== =========================== KEY Example Value Type Comment ============= ============================== ===== =========================== NAXIS1 2716 int number of wavelength pixels NAXIS2 340 int number of forests BUNIT 10**-17 erg/(s cm2 Angstrom) str quasar continuum units CHECKSUM UZ3aaZ2aVZ2aaZ2a str HDU checksum DATASUM 1634060384 str HDU data checksum ============= ============================== ===== =========================== Data: FITS image [float64, 2716x340] 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