Institute of Astronomy  

 Bob Carswell's page


Bob Carswell
Institute of Astronomy

Madingley Road
Cambridge   CB3 0HA
Office: Hoyle 16

Phone: +44.1223.337514
FAX:   +44.1223.337523
Email:  rfc (at

The main use for this page is to provide links various versions of a Voigt profile fitting program. The code is now fairly stable, though there are probably bugs in the more obscure corners of it. The downloadable gzipped tarfile also includes another program, rdgen, which may be used to set up files for vpfit, and generally looking at spectroscopic data.

There is a version VPFIT10.2 (here as a gzipped tarfile) which is still very slowly evolving but has passed the standard tests so should be OK. The documentation also gets updated occasionally. Your probably won't see any notable differences, but the are some internal improvements and some added capabilities. This is the version which gets looked at if somebody reports a possible bug, or ambiguity in the documentation. If you want an older version then VPFIT10 and VPFIT9.5 are available. The associated documentation is in vpfit10.pdf, rdgen10.pdf, vpfit9.5.pdf and rdgen9.5.pdf.

For those who might have kept the link which used to provide more detailed instructions on how to get the program, vpfit.html still exists in an updated form.

A somewhat dated collection of data showing the redshift evolution of the Lyman alpha forest, covering redshifts up to z=6.3.

Other links

And I'm not sure why I put this here, but it seemed mildly interesting in 2010 when it was added ...

Locations of visitors to this page

Last update: 14 April 2014
by rfc