Setting the Keywords used by the ANALYSE Command

Several keywords can be set with the help of the SET/INV A command. This command also displays some keywords that have already been used by the SEARCH/INV command. For your convenience these keywords are the same as those used in SEARCH/INV. Below the additional keywords are listed as well as those already described above:

LHCUTS

-- See SEARCH/INV

THRESHOLD

-- See SEARCH/INV

HALFEDGE

-- See SEARCH/INV

PAIRSPRT

-- See SEARCH/INV

ANALITER

-- Default value of this keyword equal to 0 corresponds to the case that only the base version of the command ANALYSE/INV is used. Any positive value sets the number of additional iterations. In each of these iterations the contributions from stellar neighbours are subtracted using the empirical one-dimensional point spread function. In order to obtain error estimates in the output table (columns 24 to 26) the value of this keyword should be greater than 0. In addition, the extend of the 2-dim psf has to be defined (keyword FULLPSF, see below).

PRFLCTRL

-- Number of central points of the Point Spread Function that are adjusted by the program. It is done automatically when a positive number is given. The program assumes the existance of the descriptor STARS in the input image frame with positions of standard stars when a negative number is given.

CLASSPAR

-- Maximum absolute value of relative gradient for considering the object as a star.

ZEROMAGN

-- Zero point of magnitudes. Should be set in accordance with the value of the keyword EXPRTIME.

EXPRTIME

-- The units of the exposure time should be consistent with the value of the keyword ZEROMAGN. May be set to 1 if the knowledge of exposure time is irrelevant

STMETRIC

-- Radii in pixels of two concentric circular apertures used to measure aperture magnitudes. The second of these circular apertures defines also an area over which the convolved magnitudes are calculated.

FILTER

-- See SEARCH/INV

UNITS

-- Switch between background units (0) and instrumental units (1)

MARGINS

-- See SEARCH/INV

Additional keywords are displayed for updating after giving the command SET/INV A A. Only those that have not been described already will be listed here.

FULLPSF

-- Specifies the extend in pixels of 2-dimensional p.s.f.

UNDRSMPL

-- Specifies the undersampling factor.

OUPROFIL

-- Specifies a number of pixel spaced points of one-dimensional intensity profile of objects to be recorded in output table.

PHYSICAL

-- See SEARCH/INV

IJBORDER

-- See SEARCH/INV

XYBORDER

-- See SEARCH/INV

BRIGHTOB

-- Helps to remove faint spurious objects close to bright ones. It may distort central parts of objects, therefore it should be disabled by setting it to 0 when photometric accuracy is at issue. Default is 0.

PRFLCLNG

-- Parameters used for profile cleaning.

ISOPHOTR

-- If set to 1 then the program expects to find isophotal radii of all objects in a column of an input table with label RAD_ISO. Relevant only in NOVERIFY option. Default is 0.

ETAFUNCT

-- Petrosian $\eta$-function. Used in measuring the Petrosian magnitude and radius.

NEBLIMIT

-- Relevant for dense configurations of galaxies. Prevents, when set to a positive value smaller than unity, faint galaxies from obtaining abnormally large sizes. Should be set to zero (default) in most other applications.

SPROFIL1 - SPROFIL5

-- First 25 points of the initial one-dimensional Point Spread Function.