The Past 15 Years of RVSAO
- Jessica Mink
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138
Since the last paper describing the IRAF RVSAO radial velocity package
was published almost 15 years ago, this collection of tasks dealing
with wavelength-shifted spectra has continued to grow and evolve.
Many changes have been made to improve robustness and accuracy
in the XCSAO cross-correlation and EMSAO emission line fitting tasks.
Two new tasks, PXCSAO and PEMSAO, find radial velocities using the same
methods, but save the results as task parameters, making them easier to
use in CL scripts. Spectra can now be cross-correlated in pixel or
wavelenth space as well as velocity space. A major task, EQWIDTH, based
on the IRAF BANDS task, computes equivalent widths in redshifted spectra.
SUMSPEC, which rebins, normalizes, re-redshifts, sums, and/or stacks
spectra, has proven to be useful in multi-fiber spectrograph reduction
pipelines. LISTSPEC lists spectra in a variety of user-selected formats,
and several CL scripts plot spectra with labelled emission and absorption
lines. Full documentation of this software is on-line at
Presented at the Twenty-Second Annual Conference on Astronomical Data Analysis
Software and Systems in Champaign, Illinois, November 4-8, 2012