NAME:
	match_obj
 PURPOSE:
       Compares each entry of xmm db with all entries of other (wfc or cirsi
	or apm) db and finds nearest other db  entry.
	Returns 4 arrays containing xmm no, matching other no
	and x and y distance of otherdb object to xmm object, as well as 4 
	arrays containing wfc entry no, accurate great circle distance and 
	x and y offset of all otherdb objects within 100 arcsec of an ;
	xmm object.  
 CALLING SEQUENCE:
	match_obj,xmmdb,otherdb[,xmmno,other_no,xoff,yoff,totd,totx,toty,$
	wfcnop,totd_perobj,totx_perobj,toty_perobj,ionly=ionly,gonly=gonly,$
offmax=offmax,dmax=dmax,dmin=dmin,pointer=pointer,magmax=magmax]
 INPUTS:
	xmmdb:The xmm database to be searched. Must start with 'dbase/... '
	otherdb: The other  "    	"	"	"	"	"
 OPTIONAL INPUT KEYWORDS:
	ionly: if set only objects with non-sero imag are searched in wfc db
		note this can only be called with an 'otherdb' containing
		and item labelled 'i'.
	gonly: if set only objects with non-sero gmag are searched in wfc db
		note this can only be called with an 'otherdb' containing
		and item labelled 'g'.
	If both the above are set then only objects detected in both bands
		are searched
	magmax: if set to a magnitude value, then only objects with mag > max
		are included. This can only be used if otherdb has an item
		labelled 'mag'
	offmax: STRING!!!!maximum offax angle of xmm objects to be matched. 
		If not set, all xmm objects are matched 
	dmax:	max distance for a match to be accepted (& included in xoff...)
		if not set, default is 30". In arcsec 
	dmin:	min distance for a match (use to make different set of matches:
		r<5", 5

(See /home/xmmssc/soft/idl/pro/match/match_obj.pro)




 Suzanne Aigrain 
  
<visitor2@ast.cam.ac.uk>

Last modified: Thu Feb 15 12:40:54 2001