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Event-2D: Examples.

Demonstrations of Event-2D use

18 November 2009 --

The following table gives several demonstrations of using the Event-2D software --- click on the name in the Source column to see each demonstration "thread" page which includes commands, commentary, and output plots/images. The data input (* and the 3D source model definition (*model*.sl) script files given here are useful examples for user customization.

(click below for demo)
Event file(s),
and ARF(s)
Abel 1068
Basics demo ,
Fitting & MCMC
^ click for
demo page(s)

Get the script(s)
without plots etc:
../Data/obs_1652/ :
Non-grating ACIS-S3 observation of a galaxy cluster.
The event file was downloaded and reprocessed using the TGCat scripts through level 1. The ARF was made with mkarf but using an meg rmf to supply the energy grid for higher arf resolution.
Note that a custom "3D ellipsoid beta model" is defined and used in the model generation.

X1822, C-G MCMC
^ click for
demo page

Get the script
without plots etc: ( no s3d model used )
../Data/obs_9858/ : pha2, *.arf
This example shows the C-G fitting and MCMC routines in Event-2D applied to the usual 1D fitting of an ISIS spectral dataset. The C-G and MCMC outputs are compared with the usual fit and confidence outputs.

(Note that this example is done with still-proprietary GTO data; it could just as well be done with obs_671 data below.)

These demos are
a bit outdated,
but still useful:

Hydra A
^ click
for demo
../Data/obs_4969/ : evt1_s3.fits, obs_4969.arf
../Data/obs_4970/ : evt1_s3.fits, obs_4970.arf
Non-grating ACIS-S3 observations of the Hydra A cluster.
The event files are reprocessed from the archive; the ARFs were made for the center of the cluster.
In addition to the custom "3D ellipsoid beta model" some spherical cavities are added as well.
SNR E0102
^ click
for demo
../Data/obs_3520/ :

evt2, meg_1.arf, meg_-1.arf
Obsid 3520, w/ACIS, is from the archive.

The HETG event file was created by reprocessing the archive files with a dph script and setting the cross-dispersion range to +/- 60 pixels. The source location was taken as the bright spot on the inner end of the Q stroke. The matching MEG -/+ ARFs were created using fullgarf.

^ click
for demo
../Data/obs_671/ : evt2, *.arf
An early HETG observation of the binary system.
Demonstrates the usefulness of a Wavelength-Time 2D data space.

The demonstration files can be downloaded from the links above and in the table and run by the user.

Note that the Data Input (' and Model definition (' files are user created/edited to define the input data and the model. These files for the examples are linked in the table above and should be somewhat self explanatory; they give examples of the 'work' a user needs to do to input data and define a model. While it might be tempting to have a more structured definition mechanism, this defined-by-S-Lang-file method allows the user quite a bit of control over things.

Feel free to send any comments to .