PSC

        PSC (Point Source Catalog)

    This is a general utility to look  through  the  compacted  IRAS   Point
    Source  Catalog.   This  program  is able to select sources according to
    various criteria and to create  binary  tables  and/or  formatted  files
    containing the information about the sources.  Even on tape, the program
    is fast to select sources (less than 8 minutes in any  small  positional
    box,  and  often  less).  The time needed to list the information may be
    longer if you select many sources..

    It requests as input a compacted  file  containing  the   full   catalog
    information  and  a table containing pointers to this compacted file, as
    well as positional and flux information.  The compacted catalog  can  be
    either  on  magnetic  tape  (GAG242  at  the  Groupe  d'Astrophysique in
    Grenoble), or on disk (with logical name PSC_COMPACT).  The input  table
    must  be on disk.  It can be either the default table IRAS_PSC_EQU (full
    catalog) or any previous output of the program (to  work  on  a  reduced
    source list).

    The task produces as output  a   formatted   file   and/or   an   output
    table.  A description of the formatted output can be obtained in GRAPHIC
    or OVERLAY by HELP PSC_IRAS FORMAT.  Reference to the  IRAS  explanatory
    supplement  will probably be needed except for IRAS wizards.  The output
    table has the same content as the input one  (but  of  course  only  for
    selected  sources)  and can therefore be used as input to another run of
    the program:  as an example, this will allow  to  select  first  on  the
    12/25  color  and  then  on  the  60/100  color.   Since this table is a
    standard GreG table, it can also be used in  GreG's  COLUMN  command  to
    produce  plots.   Column  1 is Right Ascension (in radians), column 2 is
    Declination (also in radians).  Columns 3 to 6 contain the 4 fluxes  (12
    to  100),  with upper limits coded as negative.  Column 7 is an internal
    pointer.  This can be used for example, to plot the distribution on  the
    sky of a given class of sources.  After some simple processing (in SIC),
    color/color plots can easily be produced.