A Quick Look at What You Have

The PPS directory for the OM products contains files with nomenclature as described in Tables 5.2 and 5.3. As can be seen in those tables, the OM produces, among other things, sky images (*SIMAGE*.FTZ) and source lists (*SWSRLI*.FTZ). Further, there are low resolution sky images for each filter; they follow the nomenclature:

• PjjjjjjkkkkOMX000LSIMAGb000.QQQ

  jjjjjj - Proposal number

  kkkk - Observation ID

  b - Filter keyword: B, V, U, M (UVM2), L (UVW1), and S (UVW2)

  QQQ - File type (e.g., PNG, FTZ)

So for example, P0123700101OMX000RSIMAGV000.FTZ is the final low resolution sky image in the V filter. As with all images, it can be viewed in Hera with fv. To see what files have been summed to make the final image, search for the keyword XPROC0 in the FITS header. For our example image, this would be

XPROC0  = 'ommosaic imagesets=''product/P0123700101OMS004SIMAGE1000.FIT produc&'
CONTINUE  't/P0123700101OMS415SIMAGE1000.FIT product/P0123700101OMS416SIMAGE10&'
CONTINUE  '00.FIT product/P0123700101OMS417SIMAGE1000.FIT product/P0123700101O&'
CONTINUE  'MS418SIMAGE1000.FIT'' mosaicedset=product/P0123700101OMX000RSIMAGV0&'
CONTINUE  '00.FIT exposuremap=no exposure=1000 # (ommosaic-1.11.7) [xmmsas_200&'
CONTINUE  '61026_1802-6.6.0]'

The source list file (*SWSRLI*.FTZ) also contains useful information for the user; the column names are listed in Table 9.1.

Table 9.1: Some of the important columns in the source list file.

Column name	Contents
SRCNUM	Source number
RA	RA of the detected source
DEC	Dec of the detected source
POSERR	Positional uncertainty
RATE	extracted count rate
RATE_ERR	error estimate on the count rate
SIGNIFICANCE	Significance of the detection (in $\sigma$)
MAG	Brightness of the source in magnitudes
MAGERR	uncertainty on the magnitude