skyplot: Plot a night sky spectrum with labelled emission lines

Package: rvsao

Usage

skyplot spectra

Parameters

spectra = ""

List of file names of spectra to plot

specband = 3

Spectrum band to plot. The sky is in band 3 in IRAF multispec files from the FAST and Hectospec spectrographs.

specnum = ""

Spectrum aperture range to plot

specdir = ""

Directory for spectrum to plot

skylines = "mmtsky.dat"

File of emission lines to label. Other good files in the same directory include mhosky1.dat and mhoskyall.dat, which have more emission lines, and skylines.dat, which has fewer.

linedir = "rvsao$lib/"

Directory for lines to label

Description

SKYPLOT runs EMSAO and displays the spectrum with night sky emission lines labelled. Type "q" to go on to the next spectrum in a list. Type "?" or space to get a menu of cursor commands.

Cursor commands

a  Set redshift guess from absorption line
b  Set blue limit of line search
c  Change continuum parameters
d  Delete data between 1st and 2nd positions
e  Set redshift guess from emission line
f  Refit redshift
g  Number of times to smooth plotted spectrum
h  Toggle print of heading with filename and redshift
i  Change initial velocity for search
j  Conditional velocity
k  Plot continuum-subtracted spectrum
l  Line search parameters
m  Number of times to smooth fit spectrum
n  Disapprove velocity
o  Turn line labelling on and off
p  Replot current graph
q  Leave plot
r  Set red limit of line search
s  Set VELOCITY to a specific value
t  Switch template for correlation velocity
u  Unzoom
v  Plot at e>mission x>correlation c>ombined velocity
w  Show rest and observed wavelengths
x  Plot correlation if available or exit
y  Approve velocity
z  Zoom between 1st and 2nd positions
.  Cancel delete or zoom
/  Toggle plot between full screen and lines
+  Add emission line to fit
-  Subtract emission line from fit
(  Plot previous aperture or order
>  Plot next aperture or order
@  Make hard copy of screen
?  Display this menu

Examples

To check the skylines in a spectrum,

cl> skyplot galaxy.ms.fits

To check sky spectra for a whole night's worth of spectra:

cl> skyplot @nite1.ls

Bugs