A spatially resolved study of ionized regions in galaxies at different ...
A spatially resolved study of ionized regions in galaxies at different ...
A spatially resolved study of ionized regions in galaxies at different ...
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54 3 • IFS <strong>of</strong> a GEHR <strong>in</strong> NGC 6946<br />
Figure 3.8: Examples <strong>of</strong> extraction <strong>of</strong> 1D spectrum <strong>of</strong> a standard star by selection <strong>of</strong> fibers <strong>in</strong> a<br />
one-po<strong>in</strong>t<strong>in</strong>g frame (upper figures) and <strong>in</strong> a mosaic <strong>of</strong> three exposures (lower figures). Note the space<br />
not covered by the fibers <strong>in</strong> the one-po<strong>in</strong>t<strong>in</strong>g frame. The central fiber is the most <strong>in</strong>tense one <strong>in</strong> all<br />
cases. Top left: Selection <strong>of</strong> 7 fibers (one central + six-fibers r<strong>in</strong>g) <strong>in</strong> a one po<strong>in</strong>t<strong>in</strong>g frame. Top right:<br />
Selection <strong>of</strong> 19 fibers (one central + six-fibers <strong>in</strong>ner r<strong>in</strong>g + twelve-fibers outer r<strong>in</strong>g) <strong>in</strong> a one po<strong>in</strong>t<strong>in</strong>g<br />
frame. Bottom left: Selection <strong>of</strong> 37 fibers (one central + six-fibers <strong>in</strong>ner r<strong>in</strong>g + twelve-fibers middle<br />
r<strong>in</strong>g + eighteen-fibers outer r<strong>in</strong>g) <strong>in</strong> a mosaic <strong>of</strong> three exposures. Bottom right: Zoom <strong>of</strong> the bottom<br />
left image <strong>of</strong> the extraction <strong>of</strong> 37 fibers <strong>in</strong> a mosaic <strong>of</strong> three exposures.<br />
the mosaic should be multiplied by this factor. If us<strong>in</strong>g R3D, this is autom<strong>at</strong>ically done if<br />
the factor is provided.<br />
Figure 3.8 shows a practical example (us<strong>in</strong>g E3D) on the extraction <strong>of</strong> the 1D spectrum <strong>of</strong><br />
a standard star by selection <strong>of</strong> fibers <strong>in</strong> a one-po<strong>in</strong>t<strong>in</strong>g frame (upper figures) and <strong>in</strong> a mosaic<br />
<strong>of</strong> three exposures (lower figures). Instead <strong>of</strong> select<strong>in</strong>g only the most <strong>in</strong>tense fiber, several<br />
fibers can be added where the light <strong>of</strong> the standard star is spread. As seen <strong>in</strong> Figure 3.8,