prepare.template: Prepare a template spectrum for kinematic analysis

In oczoske/slacR: R-package to measure v and sigma from VIMOS IFU cubes

Description

Read in a template spectrum from a fits file and prepare for the kinematic analysis of a galaxy spectrum.

Usage

prepare.template(config, file, z.temp = 0, lambda.lim=NULL, dv = 25,
                 contsub = TRUE, contdiv = TRUE, order = 16,
                 smooth.kernel = NULL, log = TRUE, ...)

Arguments

config	name of a file or list containing relevant data on the object on which the kinematic analysis is to be performed
file	fits file containing the template spectrum. Filters are allowed as understood by cfitsio
z.temp	redshift of the template (mostly 0)
lambda.lim	wavelength range to be cut from the spectrum. If NULL use the entire range.
dv	velocity step onto which the template spectrum will be rebinned if log == TRUE
contsub	logical. If TRUE a polynomial fit to the continuum will be subtracted
contdiv	logical. If TRUE, the spectrum will be divided by a polynomial fit to the continuum
order	order of polynomial fit to the continuum
smooth.kernel	numeric. If non-NULL, convolve the spectrum with a Gaussian with sigma smooth.kernel. This only works correctly if the spectrum is natively sampled on a linear wavelength scale.
log	logical. If TRUE, the template is resampled on to a logarithmic wavelength scale with velocity step dv (default).
...	further arguments to be passed to prepare.spectrum (especially normalize)

Details

Read in a spectrum from a fits file to be used as the template in the kinematic analysis of a galaxy spectrum. Optionally, a polynomial fit to the continuum will be subtracted. If the redshift of the template is not zero, deredshift the template spectrum. The template spectrum is by default rebinned onto a logarithmic wavelength grid with constant velocity step dv.

Value

a dataframe containing the following components:

lambda	logarithmic wavelength grid
name	name of fits file from which template was read
value	value of the spectrum interpolated to the logarithmic wavelength grid
contsub	value of the spectrum after continuum subtraction

Author(s)

Oliver Czoske

See Also

prepare.spectrum, prepare.cube

oczoske/slacR documentation built on May 20, 2019, 8:23 p.m.