STScI Logo

fluxcols analysis.nebular


NAME · USAGE · DESCRIPTION · PARAMETERS · SEE_ALSO

NAME

fluxcols -- Column names for input table of emission line fluxes

USAGE

fluxcols

DESCRIPTION

The `fluxcols' parameters specify the column names in the table used in the `zones' and `abund' nebular modelling tasks. These columns include the object name and region code, the nebular extinction constant and extinction correction flag, an optical-to- UV scale factor, and the line fluxes or line ratios that will be used for computing the electron temperature and density.

The default values are usable even if these columns are not present in the input table, and are really intended to give the user some flexibility in naming the table columns. If a column with the specified name already exists in the input table its contents will be used; if one does not exist the line flux is assumed to be INDEF, and the corresponding physical diagnostic and/or ionic abundance will not be based upon that line unless its value can be otherwise calculated.

Note that this is a pset, not an executable task; it defines a set of parameters used by other tasks. Invoking the pset by name runs `eparam' on the parameter set, allowing the user to modify the parameters. Alternatively, the parameters may be modified on the command line by specifying the pset name and parameter name. For example, the user can type `fluxcols.o5007_col="Oiii(5007)"' to set the name of the table column containing the [O iii] 5007 A flux to the string "Oiii(5007)". (Note that the column names are always converted to upper-case in the table.) Parameters can also be edited by using `eparam' on the calling task (e.g., by typing "eparam zones"), in which case `fluxcols' will appear as one of the task parameters; the `fluxcols' parameters may then be edited by positioning the cursor on the line containing the pset name and typing ":e". After editing the pset parameters, exit normally from eparam (with an EOF, usually <cntr-Z>) to return to the main task parameter menu.

PARAMETERS

(object_col = "Object_ID", region_col = "Region") [string]
Names of columns containing the target name, and the region within the target, if any.
(opt2uv_col = "Scale(Opt/UV)") [string]
Name of the table column containing the optical-to-UV flux scale factor. Often the nebular fluxes are listed on a scale of F(H-beta) = 100, but UV fluxes are given in scaled physical units (such as 10^{-14} erg/cm^2/s). This parameter can be used to relate the two relative scales; the default is 1.0, even if this column is not found in the input table.
(c_ext_col = "c_Extinct", extcorr_col = "Ext_Corr") [string]
Names of columns containing the logarithmic extinction at H-Beta (traditionally denoted by "c" in the literature), and the flag indicating whether the correction for I.S. extinction has already been applied to the fluxes. If the "c_Extinct" and "Ext_Corr" columns are both missing, no reddening correction is applied.
(redlaw_col = "Ext_Law") [string]
Name of the column containing the choice of interstellar extinction law to apply. If the "Ext_Law" column is missing, the average extinction law for the Galaxy (Savage & Mathis 1979) will be used if the reddening correction is performed.
(h4861_col = "Hi(4861)") [string]
Name of the column containing the flux of H-beta, 4861.3 Ang. Emission line fluxes are normalized to H(beta)=100 during the abundance calculations.
(faluminum = "") [pset]
Parameter set to specify column names for aluminum line fluxes.
(fargon = "") [pset]
Parameter set to specify column names for argon line fluxes.
(fcalcium = "") [pset]
Parameter set to specify column names for calcium line fluxes.
(fcarbon = "") [pset]
Parameter set to specify column names for carbon line fluxes.
(fchlorine = "") [pset]
Parameter set to specify column names for chlorine line fluxes.
(fmagnesium = "") [pset]
Parameter set to specify column names for magnesium line fluxes.
(fneon = "") [pset]
Parameter set to specify column names for neon line fluxes.
(fnitrogen = "") [pset]
Parameter set to specify column names for nitrogen line fluxes.
(foxygen = "") [pset]
Parameter set to specify column names for oxygen line fluxes.
(fpotassium = "") [pset]
Parameter set to specify column names for potassium line fluxes.
(fsilicon = "") [pset]
Parameter set to specify column names for silicon line fluxes.
(fsodium = "") [pset]
Parameter set to specify column names for sodium line fluxes.
(fsulfur = "") [pset]
Parameter set to specify column names for sulfur line fluxes.

SEE ALSO

abund, nlevel, zones

Type "help nebular opt=sys" for a general description of the tasks in the `nebular' package.


Package Help · Search Form · STSDAS