Vis Calibrated Catalogue Product¶

Data product name¶

DpdVisCalibratedFrameCatalog

Data product custodian¶

VIS

Name of the Schema file¶

euc-vis-CalibratedFrameCatalog.xsd

Last Edited for DPDD Version¶

2.0

Processing Element(s) creating/using the data product¶

VIS_science_xml_out

Processing function using the data product¶

SHE processing functions.

Proposed for inclusion in EAS/SAS¶

Yes

Data product elements¶

Header:: object of type sys:genericHeader
Data:: object of type vis:visCalibratedFrameCatalogData
QualityFlags:: object of type dqc:sqfPlaceHolder
Parameters:: object of type ppr:genericKeyValueParameters

Detailed description of the data product¶

The VIS processing function provides a series of catalogues delivered in FITS “LDAC” format. These catalogues are produced using SExtractor (Bertin & Arnouts 1996).

The VisPSFModel is given in entry of the VIS pipeline for fitting a spread model. The spread model is then used to calculate a zero point by comparing to Gaia data.

This calibrated catalogue contains 2 types of tables :

The LDAC_IMHEAD table, a 1-column catalogue containing the header and some information (like SE parameters) of the original image.

The LDAC_OBJECTS table, a 84-colum catalogue. These columns are described below.

We calculate the magnitude in 4 apertures : 7, 13, 26 and 50 pixels.

An aperture correction is calculated with the differences between magAper 13 and magAper 50. Then the relevant aperture to use is mag_aper 13 with this aperture correction (APERCORR).

Changes introduced by the PF version¶

PF 17.0¶

MAG_AUTO is now a calibrated magnitude, and the raw value is stored in the new column MAG_AUTO_RAW
MAG_APER[0] (7-pixel aperture), MAG_APER[2] (26-pixel aperture), MAG_APER[3] (50-pixel aperture) are now calibrated magnitudes
raw values of 7, 13, 26, 50-pixel aperture magnitudes are stored in new columns MAG_APER_RAW[0-3]
calibrated fluxes and associated errors are stored in new columns FLUX_AUTO_CAL / FLUX_APER_CAL and FLUXERR_AUTO_CAL / FLUXERR_APER_CAL

Column descriptions¶

Name	Units	Description
FLAGS	NA	SExtractor extraction flags, basic warnings about the source extraction process, in order of increasing concern.
FLAGS_WIN	NA	SExtractor flag for various issues which may happen with windowed measurements.
FLAGS_MODEL	NA	SExtractor flag for various issues which may happen during the fitting process.
IMAFLAGS_ISO	NA	Flags from the flag map maid during the processing. See VisFlagMap for flags details.
NIMAFLAGS_ISO	NA	Number(s) of relevant flag map pixels.
SPREAD_MODEL	NA	Spread parameter from model-fitting. Stars are object with: abs(SPREAD_MODEL) $< 0.003$ .
FLUX_AUTO	Count	Flux within a Kron-like elliptical aperture. This flux is not calibrated.
FLUX_APER	Count	Flux in an aperture. This flux is not calibrated.
FLUXERR_AUTO	Count	RMS error for AUTO flux.
MAG_AUTO	mag	Kron-like elliptical aperture magnitude. This magnitude is calibrated.
MAGERR_AUTO	mag	RMS error for AUTO magnitude.
FLUX_RADIUS	Count	Fraction-of-light radii (pixels).
MAG_APER	mag	Magnitude calibrated in a defined aperture.
MAGERR_APER	mag	Error of the calibrated magnitude in aperture.
MAG_APER_RAW	mag	Raw values of mag aper, i.e without the zero point. It is the instrumental magnitude.
MAG_AUTO_RAW	mag	Raw values of MAG_AUTO.
FLUX_AUTO_CAL	uJy	Flux calibrated by applying the zero-point.
FLUXERR_AUTO_CAL	uJy	Error in calibrated flux auto.
FLUX_APER_CAL	uJy	Flux in aperture calibrated.
FLUXERR_APER_CAL	uJy	Errors in flux aperture calibrated.
NUMBER	NA	Running object number
X_IMAGE	pixel	Object position along x
Y_IMAGE	pixel	Object position along y
XPSF_IMAGE	pixel	X coordinate from PSF-fitting
YPSF_IMAGE	pixel	Y coordinate from PSF-fitting
X_WORLD	deg	Barycenter position along world x axis
Y_WORLD	deg	Barycenter position along world y axis
ERRA_WORLD	deg	Major axis of the isophotal image centroid error ellipse
ERRB_WORLD	deg	Minor axis of the isophotal image centroid error ellipse
ERRTHETA_WORLD	deg	Position angle of the isophotal image centroid ellipse
XPSF_WORLD	deg	PSF position along world x axis
YPSF_WORLD	deg	PSF position along world y axis
ERRAPSF_WORLD	pixel	Major axis of the PSF
ERRBPSF_WORLD	pixel	Minor axis of the PSF
ERRTHETAPSF_WORLD	deg	Position angle of the PSF
A_WORLD	deg	Profile RMS along major axis (world units)
B_WORLD	deg	Profile RMS along minor axis (world units)
THETA_WORLD	deg	Position angle (CCW/world-x)
ERRX2_WORLD	deg**2	Estimated variance of isophotal image centroid x coordinate
ERRY2_WORLD	deg**2	Estimated variance of isophotal image centroid y coordinate
ALPHA_J2000	deg	J2000 right ascension of the isophotal image centroid
DELTA_J2000	deg	J2000 declination of the isophotal image centroid
ERRTHETA_J2000	deg	J2000 Position angle of the isophotal image centroid ellipse
THETA_J2000	deg	Isophotal image position angle
XWIN_WORLD	deg	x coordinate of windowed image centroid
YWIN_WORLD	deg	y coordinate of windowed image centroid
ALPHAPSF_J2000	deg	Right ascension of the fitted PSF (J2000)
DELTAPSF_J2000	deg	Declination of the fitted PSF (J2000)
ERRTHETAPSF_J2000	deg	Position angle of the fitted PSF (J2000)
ALPHAWIN_J2000	deg	Right ascension of the windowed image
DELTAWIN_J2000	deg	Declinaison of of the windowed image
ERRAWIN_WORLD	deg	Major axis of the windowed image centroid error ellipse
ERRBWIN_WORLD	deg	Minor axis of the windowed image centroid error ellipse
ERRTHETAWIN_WORLD	deg	Position angle of the windowed image centroid ellipse
AWIN_WORLD	deg	Windowed image major axis
BWIN_WORLD	deg	Windowed image minor axis
THETAWIN_WORLD	deg	Windowed image position angle
ERRX2WIN_WORLD	deg**2	Estimated variance of windowed image centroid x coordinate
ERRY2WIN_WORLD	deg**2	Estimated variance of windowed image centroid y coordinate
MU_THRESHOLD	$m a g * a r c s e c^{- 2}$	The surface brightness corresponding to the threshold
MU_MAX	$m a g * a r c s e c^{- 2}$	The surface brightness of the brightest pixel
MU_MAX_MODEL	$m a g * a r c s e c^{- 2}$	Peak model surface brightness above the background
MU_EFF_MODEL	$m a g * a r c s e c^{- 2}$	Effective model surface brightness above the background
MU_MEAN_MODEL	$m a g * a r c s e c^{- 2}$	Mean effective model surface brightness above the background
MU_MAX_SPHEROID	$m a g * a r c s e c^{- 2}$	Peak model surface brightness above the background using Sérsic ( $R^{1 / n}$ ) spheroid model
MU_EFF_SPHEROID	$m a g * a r c s e c^{- 2}$	Effective model surface brightness above the background using Sérsic ( $R^{1 / n}$ ) spheroid model
MU_MEAN_SPHEROID	$m a g * a r c s e c^{- 2}$	Mean effective model surface brightness above the background using Sérsic ( $R^{1 / n}$ ) spheroid model
MU_MAX_DISK	$m a g * a r c s e c^{- 2}$	Peak model surface brightness above the background using exponential disk model
MU_EFF_DISK	$m a g * a r c s e c^{- 2}$	Effective model surface brightness above the background using exponential disk model
MU_MEAN_DISK	$m a g * a r c s e c^{- 2}$	Mean effective model surface brightness above the background using exponential disk model
BACKGROUND	count	Background at centroid position
MAG_PSF	mag	Magnitude from PSF-fitting
MAGERR_PSF	mag	RMS magnitude error from PSF-fitting
ELLIPTICITY	NA	1 - B IMAGE/A IMAGE
ELONGATION	NA	A IMAGE/B IMAGE
FWHM_IMAGE	pixel	FWHM assuming a Gaussian core
SNR_WIN	NA	Signal to noise ratio of the windowed image
ERRAWIN_IMAGE	pixel	Major axis of the windowed image centroid error ellipse
ERRBWIN_IMAGE	pixel	Minor axis of the windowed image centroid error ellipse
ERRTHETAWIN_IMAGE	pixel	Position angle of the windowed image centroid ellipse
XWIN_IMAGE	pixel	x coordinate of windowed image centroid
YWIN_IMAGE	pixel	y coordinate of windowed image centroid
SNR	NA	Signal to noise ratio

User case¶

Selection of Stars: You can use the spread model to select all the stars of the catalogue (i.e. abs(SPREAD_MODEL) $< 0.003$ ). However this can also select cosmic rays that are not correctly detected. We recommend to also use a selection in magnitude and FLUX_RADIUS for better results. If you want no saturated star, you need also to select object with Flags=0.

Selection of valid pixels: To select an object with only valid pixels, you must use:
IMAFLAGS_ISO != VIS_FLAG[INVALID]
which is equivalent to  IMAFLAGS_ISO%2 == 0.

Header¶

Primary Header
SIMPLE	This is a FITS file
BITPIX
NAXIS
EXTEND	This file may contain FITS extensions

LDAC_IMHEAD header
XTENSION	THIS IS A BINARY TABLE (FROM THE LDACTOOLS)
BITPIX
NAXIS
NAXIS1	BYTES PER ROW
NAXIS2	NUMBER OF ROWS
PCOUNT	RANDOM PARAMETER COUNT
GCOUNT	GROUP COUNT
TFIELDS	FIELDS PER ROWS
EXTNAME	TABLE NAME
TTYPE1
TFORM1
TDIM1

LDAC_OBJECTS header
XTENSION	binary table extension
BITPIX	array data type
NAXIS	number of array dimensions
NAXIS1	length of dimension 1
NAXIS2	length of dimension 2
PCOUNT	number of group parameters
GCOUNT	number of groups
TFIELDS	number of table fields
EXTNAME	‘TABLE NAME
TTYPE1	‘NUMBER ‘
TFORM1	‘1J ‘
TDISP1	‘I10 ‘
TTYPE2	‘X_IMAGE ‘
TFORM2	‘1E ‘
TUNIT2	‘pixel ‘
TDISP2	‘F11.4 ‘
TTYPE3	‘Y_IMAGE ‘
TFORM3	‘1E ‘
TUNIT3	‘pixel ‘
TDISP3	‘F11.4 ‘
TTYPE4	‘XPSF_IMAGE’
TFORM4	‘1D ‘
TUNIT4	‘pixel ‘
TDISP4	‘F11.4 ‘
TTYPE5	‘YPSF_IMAGE’
TFORM5	‘1D ‘
TUNIT5	‘pixel ‘
TDISP5	‘F11.4 ‘
TTYPE6	‘X_WORLD ‘
TFORM6	‘1D ‘
TUNIT6	‘deg ‘
TDISP6	‘E18.10 ‘
TTYPE7	‘Y_WORLD ‘
TFORM7	‘1D ‘
TUNIT7	‘deg ‘
TDISP7	‘E18.10 ‘
TTYPE8	‘ERRA_WORLD’
TFORM8	‘1E ‘
TUNIT8	‘deg ‘
TDISP8	‘G12.7 ‘
TTYPE9	‘ERRB_WORLD’
TFORM9	‘1E ‘
TUNIT9	‘deg ‘
TDISP9	‘G12.7 ‘
TTYPE10	‘ERRTHETA_WORLD’
TFORM10	‘1E ‘
TUNIT10	‘deg ‘
TDISP10	‘F6.2 ‘
TTYPE11	‘XPSF_WORLD’
TFORM11	‘1D ‘
TUNIT11	‘deg ‘
TDISP11	‘E18.10 ‘
TTYPE12	‘YPSF_WORLD’
TFORM12	‘1D ‘
TUNIT12	‘deg ‘
TDISP12	‘E18.10 ‘
TTYPE13	‘ERRAPSF_WORLD’
TFORM13	‘1E ‘
TUNIT13	‘pixel ‘
TDISP13	‘G12.7 ‘
TTYPE14	‘ERRBPSF_WORLD’
TFORM14	‘1E ‘
TUNIT14	‘pixel ‘
TDISP14	‘G12.7 ‘
TTYPE15	‘ERRTHETAPSF_WORLD’
TFORM15	‘1E ‘
TUNIT15	‘deg ‘
TDISP15	‘F6.2 ‘
TTYPE16	‘A_WORLD ‘
TFORM16	‘1E ‘
TUNIT16	‘deg ‘
TDISP16	‘G12.7 ‘
TTYPE17	‘B_WORLD ‘
TFORM17	‘1E ‘
TUNIT17	‘deg ‘
TDISP17	‘G12.7 ‘
TTYPE18	‘THETA_WORLD’
TFORM18	‘1E ‘
TUNIT18	‘deg ‘
TDISP18	‘F6.2 ‘
TTYPE19	‘ERRX2_WORLD’
TFORM19	‘1D ‘
TUNIT19	‘deg**2 ‘
TDISP19	‘E18.10 ‘
TTYPE20	‘ERRY2_WORLD’
TFORM20	‘1D ‘
TUNIT20	‘deg**2 ‘
TDISP20	‘E18.10 ‘
TTYPE21	‘ALPHA_J2000’
TFORM21	‘1D ‘
TUNIT21	‘deg ‘
TDISP21	‘F11.7 ‘
TTYPE22	‘DELTA_J2000’
TFORM22	‘1D ‘
TUNIT22	‘deg ‘
TDISP22	‘F11.7 ‘
TTYPE23	‘ERRTHETA_J2000’
TFORM23	‘1E ‘
TUNIT23	‘deg ‘
TDISP23	‘F6.2 ‘
TTYPE24	‘THETA_J2000’
TFORM24	‘1E ‘
TUNIT24	‘deg ‘
TDISP24	‘F6.2 ‘
TTYPE25	‘XWIN_WORLD’
TFORM25	‘1D ‘
TUNIT25	‘deg ‘
TDISP25	‘E18.10 ‘
TTYPE26	‘YWIN_WORLD’
TFORM26	‘1D ‘
TUNIT26	‘deg ‘
TDISP26	‘E18.10 ‘
TTYPE27	‘ALPHAPSF_J2000’
TFORM27	‘1D ‘
TUNIT27	‘deg ‘
TDISP27	‘F11.7 ‘
TTYPE28	‘DELTAPSF_J2000’
TFORM28	‘1D ‘
TUNIT28	‘deg ‘
TDISP28	‘F11.7 ‘
TTYPE29	‘ERRTHETAPSF_J2000’
TFORM29	‘1E ‘
TUNIT29	‘deg ‘
TDISP29	‘F6.2 ‘
TTYPE30	‘ALPHAWIN_J2000’
TFORM30	‘1D ‘
TUNIT30	‘deg ‘
TDISP30	‘F11.7 ‘
TTYPE31	‘DELTAWIN_J2000’
TFORM31	‘1D ‘
TUNIT31	‘deg ‘
TDISP31	‘F11.7 ‘
TTYPE32	‘ERRAWIN_WORLD’
TFORM32	‘1E ‘
TUNIT32	‘deg ‘
TDISP32	‘G12.7 ‘
TTYPE33	‘ERRBWIN_WORLD’
TFORM33	‘1E ‘
TUNIT33	‘deg ‘
TDISP33	‘G12.7 ‘
TTYPE34	‘ERRTHETAWIN_WORLD’
TFORM34	‘1E ‘
TUNIT34	‘deg ‘
TDISP34	‘F6.2 ‘
TTYPE35	‘AWIN_WORLD’
TFORM35	‘1E ‘
TUNIT35	‘deg ‘
TDISP35	‘G12.7 ‘
TTYPE36	‘BWIN_WORLD’
TFORM36	‘1E ‘
TUNIT36	‘deg ‘
TDISP36	‘G12.7 ‘
TTYPE37	‘THETAWIN_WORLD’
TFORM37	‘1E ‘
TUNIT37	‘deg ‘
TDISP37	‘F6.2 ‘
TTYPE38	‘ERRX2WIN_WORLD’
TFORM38	‘1D ‘
TUNIT38	‘deg**2 ‘
TDISP38	‘E18.10 ‘
TTYPE39	‘ERRY2WIN_WORLD’
TFORM39	‘1D ‘
TUNIT39	‘deg**2 ‘
TDISP39	‘E18.10 ‘
TTYPE40	‘MU_THRESHOLD’
TFORM40	‘1E ‘
TUNIT40	‘mag * arcsec**(-2)’
TDISP40	‘F8.4 ‘
TTYPE41	‘MU_MAX ‘
TFORM41	‘1E ‘
TUNIT41	‘mag * arcsec**(-2)’
TDISP41	‘F8.4 ‘
TTYPE42	‘MU_MAX_MODEL’
TFORM42	‘1E ‘
TUNIT42	‘mag * arcsec**(-2)’
TDISP42	‘F8.4 ‘
TTYPE43	‘MU_EFF_MODEL’
TFORM43	‘1E ‘
TUNIT43	‘mag * arcsec**(-2)’
TDISP43	‘F8.4 ‘
TTYPE44	‘MU_MEAN_MODEL’
TFORM44	‘1E ‘
TUNIT44	‘mag * arcsec**(-2)’
TDISP44	‘F8.4 ‘
TTYPE45	‘MU_MAX_SPHEROID’
TFORM45	‘1E ‘
TUNIT45	‘mag * arcsec**(-2)’
TDISP45	‘F8.4 ‘
TTYPE46	‘MU_EFF_SPHEROID’
TFORM46	‘1E ‘
TUNIT46	‘mag * arcsec**(-2)’
TDISP46	‘F8.4 ‘
TTYPE47	‘MU_MEAN_SPHEROID’
TFORM47	‘1E ‘
TUNIT47	‘mag * arcsec**(-2)’
TDISP47	‘F8.4 ‘
TTYPE48	‘MU_MAX_DISK’
TFORM48	‘1E ‘
TUNIT48	‘mag * arcsec**(-2)’
TDISP48	‘F8.4 ‘
TTYPE49	‘MU_EFF_DISK’
TFORM49	‘1E ‘
TUNIT49	‘mag * arcsec**(-2)’
TDISP49	‘F8.4 ‘
TTYPE50	‘MU_MEAN_DISK’
TFORM50	‘1E ‘
TUNIT50	‘mag * arcsec**(-2)’
TDISP50	‘F8.4 ‘
TTYPE51	‘ELLIPTICITY’
TFORM51	‘1E ‘
TDISP51	‘F8.3 ‘
TTYPE52	‘FLUX_AUTO’
TFORM52	‘1E ‘
TUNIT52	‘count ‘
TDISP52	‘G12.7 ‘
TTYPE53	‘FLUXERR_AUTO’
TFORM53	‘1E ‘
TUNIT53	‘count ‘
TDISP53	‘G12.7 ‘
TTYPE54	‘MAG_AUTO’
TFORM54	‘1E ‘
TUNIT54	‘mag ‘
TDISP54	‘F8.4 ‘
TTYPE55	‘MAGERR_AUTO’
TFORM55	‘1E ‘
TUNIT55	‘mag ‘
TDISP55	‘F8.4 ‘
TTYPE56	‘BACKGROUND’
TFORM56	‘1E ‘
TUNIT56	‘count ‘
TDISP56	‘G12.7 ‘
TTYPE57	‘MAG_APER’
TFORM57	‘4E ‘
TUNIT57	‘mag ‘
TDISP57	‘F8.4 ‘
TTYPE58	‘MAGERR_APER’
TFORM58	‘4E ‘
TUNIT58	‘mag ‘
TDISP58	‘F8.4 ‘
TTYPE59	‘FLUX_APER’
TFORM59	‘4E ‘
TUNIT59	‘count ‘
TDISP59	‘G12.7 ‘
TTYPE60	‘FLUXERR_APER’
TFORM60	‘4E ‘
TUNIT60	‘count ‘
TDISP60	‘G12.7 ‘
TTYPE61	‘MAG_PSF ‘
TFORM61	‘1E ‘
TUNIT61	‘mag ‘
TDISP61	‘F8.4 ‘
TTYPE62	‘MAGERR_PSF’
TFORM62	‘1E ‘
TUNIT62	‘mag ‘
TDISP62	‘F8.4 ‘
TTYPE63	‘FLUX_RADIUS’
TFORM63	‘1E ‘
TUNIT63	‘pixel ‘
TDISP63	‘F10.3 ‘
TTYPE64	‘ELONGATION’
TFORM64	‘1E ‘
TDISP64	‘F8.3 ‘
TTYPE65	‘FWHM_IMAGE’
TFORM65	‘1E ‘
TUNIT65	‘pixel ‘
TDISP65	‘F8.2 ‘
TTYPE66	‘SNR_WIN ‘
TFORM66	‘1E ‘
TDISP66	‘G10.4 ‘
TTYPE67	‘SPREAD_MODEL’
TFORM67	‘1E ‘
TDISP67	‘G11.5 ‘
TTYPE68	‘FLAGS ‘
TFORM68	‘1I ‘
TDISP68	‘I3 ‘
TTYPE69	‘FLAGS_WIN’
TFORM69	‘1I ‘
TDISP69	‘I3 ‘
TTYPE70	‘FLAGS_MODEL’
TFORM70	‘1B ‘
TDISP70	‘I3 ‘
TTYPE71	‘ERRAWIN_IMAGE’
TFORM71	‘1E ‘
TUNIT71	‘pixel ‘
TDISP71	‘F9.5 ‘
TTYPE72	‘ERRBWIN_IMAGE’
TFORM72	‘1E ‘
TUNIT72	‘pixel ‘
TDISP72	‘F9.5 ‘
TTYPE73	‘ERRTHETAWIN_IMAGE’
TFORM73	‘1E ‘
TUNIT73	‘deg ‘
TDISP73	‘F6.2 ‘
TTYPE74	‘IMAFLAGS_ISO’
TFORM74	‘1J ‘
TDISP74	‘I9 ‘
TTYPE75	‘NIMAFLAGS_ISO’
TFORM75	‘1J ‘
TDISP75	‘I9 ‘
TTYPE76	‘XWIN_IMAGE’
TFORM76	‘1D ‘
TUNIT76	‘pixel ‘
TDISP76	‘F11.4 ‘
TTYPE77	‘YWIN_IMAGE’
TFORM77	‘1D ‘
TUNIT77	‘pixel ‘
TDISP77	‘F11.4 ‘
TTYPE78	‘MAG_APER_RAW’
TFORM78	‘4E ‘
TUNIT78	‘mag ‘
TTYPE79	‘MAG_AUTO_RAW’
TFORM79	‘1E ‘
TUNIT79	‘mag ‘
TTYPE80	‘FLUX_APER_CAL’
TFORM80	‘4E ‘
TUNIT80	‘uJy ‘
TTYPE81	‘FLUXERR_APER_CAL’
TFORM81	‘4E ‘
TUNIT81	‘uJy ‘
TTYPE82	‘FLUX_AUTO_CAL’
TFORM82	‘1E ‘
TUNIT82	‘uJy ‘
TTYPE83	‘FLUXERR_AUTO_CAL’
TFORM83	‘1E ‘
TUNIT83	‘uJy ‘
TTYPE84	‘SNR ‘
TFORM84	‘E ‘
CCDID
QUADID
WCSAXES
CTYPE1
CTYPE2
CUNIT1
CUNIT2
A_ORDER
B_ORDER
CRPIX1
CRPIX2
CD1_1
CD1_2
CD2_1
CD2_2
A_0_2
A_0_3
A_1_1
A_1_2
A_2_0
A_2_1
A_3_0
B_0_2
B_0_3
B_1_1
B_1_2
B_2_0
B_2_1
B_3_0
CRVAL1
CRVAL2
STDCRMS
NUMBRMS
AVGRESID