Introduction to the AGC database
Members of the ALFALFA team have access to the private database dubbed the
"AGC" which is compiled and maintained by Martha and Riccardo at Cornell
(for more years than we will admit!). Hours and hours of time are spent updating
and maintaining it, and it contains a lot of really useful information. We hope
you will find it helpful in your ALFALFA-related research. However:
- there are conditions for its use; READ THEM;
- you need to understand its limitations; that's YOUR
RESPONSIBILITY! Follow the link on the AGC conditions page (above) to read the AGC
documentation page. Make sure you understand what all of the entries are.
From Scavenger Hunt #1 of the UAT Jan2008 workshop:
- What is the "UGC"?
- When is the AGC entry number equal to the UGC entry number?
- What is the "position angle"?
- What is the "TELCODE" for Arecibo+ALFA?
- Some galaxies have two velocity measurements: "VOPT" and "V21".
In that case, what should you adopt as the recessional velocity
for the galaxy?
- Sometimes, "V21" is entered but does not indicate the redshift
of the galaxy. Why not? Find us an example.
- Sometimes "VOPT" is actually a 21 cm velocity. Some of these are easy
to identify. How? Find us an example.
Practice using the IDL utilities that use the AGC
via
Scavenger Hunt #2
Back to Using ALFA for ALFALFA
Back to Using ALFALFA for science
Back to UAT Groups team page
Last updated Sun Jun 22 13:34:17 EDT 2008 by martha