TABLE  QsoBest

This table is copied from the 'base' Best..PhotoObjAll Table. It has a row for each object flagged as a QSO (a candidate) and if no candidate exists nearby a Spec or Target candidate then a 'surrogate' Base object is added -- the closest Best within 1.5 asec of the QsoBunch head. If no such surrogate best object can be found, we use the ZERO surrogate (literally, all fields are zero). The test for a best object being a QSO candidate is: primary target flags set to one of TARGET_QSO_HIZ |TARGET_QSO_CAP | TARGET_QSO_SKIRT |TARGET_QSO_FIRST_CAP | TARGET_QSO_FIRST_SKIRT The table also includes the id and summary statistics for matching FIRST and ROSAT objects if they exist, and zero otherwise Includes the absolute magnitude based on Pen (1999) and Pei (1999) if a reliable reshift is available from a specobj object in the bunch.

name	type	length	unit	ucd	description
bestObjID	bigint	8			Unique SDSS identifier
headObjID	bigint	8		ID_MAIN	object ID of bunch head
bestRa	float	8	deg		J2000 right ascension (r')
bestDec	float	8	deg		J2000 declination (r')
bestCx	float	8		POS_EQ_CART_X	unit vector for ra+dec
bestCy	float	8		POS_EQ_CART_Y	unit vector for ra+dec
bestCz	float	8		POS_EQ_CART_Z	unit vector for ra+dec
bestPsfMag_u	real	4	mag	PHOT_SDSS_U	PSF flux
bestPsfMag_g	real	4	mag	PHOT_SDSS_G	PSF flux
bestPsfMag_r	real	4	mag	PHOT_SDSS_R	PSF flux
bestPsfMag_i	real	4	mag	PHOT_SDSS_I	PSF flux
bestPsfMag_z	real	4	mag	PHOT_SDSS_Z	PSF flux
bestPsfMagErr_u	real	4	mag		PSF flux error
bestPsfMagErr_g	real	4	mag		PSF flux error
bestPsfMagErr_r	real	4	mag		PSF flux error
bestPsfMagErr_i	real	4	mag		PSF flux error
bestPsfMagErr_z	real	4	mag		PSF flux error
bestExtinction_u	real	4	mag		Extinction in each filter
bestExtinction_g	real	4	mag		Extinction in each filter
bestExtinction_r	real	4	mag		Extinction in each filter
bestExtinction_i	real	4	mag		Extinction in each filter
bestExtinction_z	real	4	mag		Extinction in each filter
bestType	int	4			Morphological type classification
bestMode	int	4			1:primary, 2:secondary, 4:outside survey
bestFlags	bigint	8			Photo Object Attribute Flags
bestFlags_u	bigint	8			Object detection flags per band
bestFlags_g	bigint	8			Object detection flags per band
bestFlags_r	bigint	8			Object detection flags per band
bestFlags_i	bigint	8			Object detection flags per band
bestFlags_z	bigint	8			Object detection flags per band
bestRowC_i	real	4			Row center position (r' coordinates)
bestColC_i	real	4			Column center position (r' coordinates)
bestInsideMask	int	4			Flag indicates if object is inside a mask
bestPrimTarget	int	4			Bit mask of primary target categories
bestPriTargHiZ	int	4			1: object flagged as HiZ QSO
bestPriTargLowZ	int	4			1: object flagged as cap|skirt
bestPriTargFirst	int	4			1: object flagged as first cap|skirt QSO
bestFieldID	bigint	8			Link to the field this object is in
bestFieldMjd	float	8			MJD(TAI) Julian Date when row 0 was read
bestFieldQuality	int	4			Quality of field in terms of acceptance
bestFieldCulled	int	4			Targets culled from the field
bestFirstID	int	4			FIRST catalog id of one matching source
bestFirstPeak	float	8	mJy		Peak first radio flux
bestRosatID	int	4			ID of matching ROSAT source (0 =no match)
bestRosatCps	float	8	ct/s		integrated ROSAT counts
bestMi	float	8			estimated absolute magnitude based on Pen (1999) and Pei (1999) (or 0)
BestQsoTargeted	tinyint	1			1: means this was flagged QSO