Mapping with the Arecibo Telescope
S. Stanimirovic (Arecibo Observatory) & M. Krco (Colgate University)
Data Reduction Codes:
- AO_Map_setup: sets all
necessary paths for data reduction and compiles codes to be used. Make sure
to edit lines that sets appropriate paths for your particular set up. Point
to Phil's generic IDL routines, to the IDL Astronomy User's Library, and
to the directory where aogridzilla.pro is.
opens a given file and searches for all maps that were observed; asks what
to reduce; calibrates and subtracts baseline; makes reduced output file and
a file containing weights to be given to individual spectra. You do not
need to edit this file.
combines all reduced individual maps for an object into a big `structure'
that is used for making a spectral-line data cube; it also creates the
final big array of weights for each observed spectrum. You do not need to
edit this file.
this is an interface code for the main gridding routine, called
aogridzilla. It points to files and parameters aogridzilla will use for
making a spectral-line data cube. You need to edit this file to pass
information to the gridzilla.
- Note that aogridzilla uses the IDL Astronomy User's Library
(info is on http://idlastro.gsfc.nasa.gov/contents.html).
- Data Reduction Pipe-line:
- Obtain generic IDL routines for handling Arecibo data from
Perillat's web page
- Start idl
- @AO_Map_setup; this sets all paths and compiles necessary codes. Make
sure to edit this file first in order to set your working directory, name
of your maps etc.
- Run file_reducer; you will be asked for date of your correlator file
and which maps you want to reduce.
- Run file_combiner; this will combine all small maps into one big array.
- Run file_gridder; this will create a spectral-line data cube.
- Once the spectral-line cubes are ready we usually look at them with
visualization package written by Richard Gooch.
We are in the process of writing a manual for on-the-fly mapping at the
Arecibo telescope. Until this manual is ready, here is a document written for the
NAIC--NRAO Single-dish summer school (2001) for a hands-on experiment
involving mapping of a HVC. You can find here
some basic information
about observing parameters when on-the-fly mapping and also some basic
steps for data reduction.
Additional Data Reduction Tools:
Will be here soon.
17-March-2002 Snezana Stanimirovic