STScI Logo


.help zvel Mar94 rvsao
zvel -- Compute redshift using the cross-correlation and emission line techniques
zvel spectra
.ls imagelist = ""
List of file names of spectra to analyze.
@<filename> indicates list should come from file <filename>.
<filename>[<range>] indicates that a range of apertures in a multispec
file should be processed, where <range> is a comma- and/or
hyphen-separated list of numbers.
.ls imagext=".imh"
Image header file name extension
.ls emis_vel=yes
Compute emission line velocities (yes or no)
.ls corr_vel=yes
Compute cross correlation velocities (yes or no)
.ls plot=yes
Plot results on display (yes or no)
.ls hard_copy=no
Make printer hard copies (yes or no)
.ls curmode = no
If yes, wait in cursor mode after each spectrum is processed.  Cursor
mode commands may be listed by typing "?".
.ls verbose = no
If yes, values of the parameters fit to the selected peak
are recorded in the log files.  This is most useful for debugging.
ZVEL runs either XCSAO or EMSAO or both, so the user doesn't have to
type a file name in twice.  Set parameters in XCSAO, EMSAO, and CONTPARS.
curmode, hard_copy, plot, and verbose override the equivalent parameters
in XCSAO and EMSAO.  If both XCSAO and EMSAO are being run, the image
files should be writeable so the cross-correlation velocity can be saved
to be used as an initial guess at the emission line velocity.

To obtain the redshift and dispersion of a single galaxy

        cl> zvel galaxy

To obtain redshifts for a whole night's worth of galaxy spectra:

        cl> zvel


Source Code · Search Form · STSDAS