Create and Display an Image

To create an image in sky coordinates by using the heraXmmselect GUI:

1)

Check the square boxes to the left of the ``X'' and ``Y'' entries.

2)

Click on the ``Image'' button near the bottom of the page. This brings up the evselect GUI (see Figure 7.1).

3)

In the imageset box (under the Image tab), enter the name of the output file, in this case, image.fits.

4)

Click on the ``Run'' button on the lower left corner of the evselect GUI.

Different binnings and other selections can be invoked by accessing the ``Image'' tab at the top of the GUI. The default settings are reasonable, however, for a basic image. The resultant image is written to the file image.fits, and is automatically displayed with POW. It can also be downloaded to your local machine and viewed with ds9; see Figure 7.2.

To create an image in sky coordinates by using the Command Window, type:

evselect table=mos1.fits withimageset=yes imageset=image.fits
$$ xcolumn=X ycolumn=Y imagebinning=imageSize ximagesize=600 yimagesize=600

where

table - input event table
withimageset - make an image
imageset - name of output image
xcolumn - event column for X axis
ycolumn - event column for Y axis
imagebinning - form of binning, force entire image into a given size or bin by a specified number of pixels
ximagesize - output image pixels in X
yimagesize - output image pixels in Y

The resultant image is written to the file image.fits. It can be viewed with POW, or downloaded to your local machine and viewed with ds9; see Figure 7.2.

Figure 7.1: The evselect GUI.

Figure 7.2: The MOS1 image, displayed in fv.