Data model: photoFirst

General description: Match of objects in a field of an SDSS imaging catalog to the FIRST radio survey catalog (2008 version). These matches are to any objects which are RUN_PRIMARY according to the local resolve (see resolve documentation). Results are reported for all objects, and "first_skyrms" reports the noise level of FIRST at each location.

Naming convention: photoFirst-RUN6-CAMCOL-FIELD4.fits

Approximate size: 20 kbytes.

File type: FITS

Read by products: sas

Written by products: photoop

Required header keywords:

• P_RESOLV (string): path for PHOTO_RESOLVE variable
• P_CALIB (string): path for PHOTO_CALIB variable

Required column names:

• run (int32): Run number
• camcol (int32): Camera column
• field (int32): Field number
• id (int32): The object id within a field. Usually changes between reruns of the same field
• rerun (string): Rerun number
• objID (int64): Unique SDSS identifier composed from [skyVersion,rerun,run,camcol,field,obj].
• run_resolve_status (int32): status flag for local resolve
• ra (float64): SDSS right ascension, J2000 (deg)
• dec (float64): SDSS declination, J2000 (deg)
• first_ra (float64): FIRST source right ascension, J2000 (deg)
• first_dec (float64): FIRST source declination, J2000 (deg)
• first_sideprob (float64): probability of being a side-lobe detection
• first_fpeak (float32): Peak FIRST radio flux (mJy)
• first_fint (float32): Integrated FIRST radio flux (mJy)
• first_rms (float32): rms error in flux (mJy)
• first_maj (float32): Major axis (deconvolved) (arcsec)
• first_min (float32): Minor axis (deconvolved) (arcsec)
• first_pa (float32): position angle (east of north) (deg)
• first_fmaj (float32): Major axis (not deconvolved) (arcsec)
• first_fmin (float32): Minor axis (not deconvolved) (arcsec)
• first_fpa (float32): position angle (east of north, not deconvolved) (deg)
• first_skyrms (float32): background rms error in flux (mJy)
• first_matchdist (float32): distance of match (arcsec)