Cooling Line Galaxies

Twenty five galaxies were chosen to compare ISO and Spitzer data. In order to verify that the regions extracted were legitimate, we made region plots to show which parts of which galaxies were being compared. The ISO had two "beams" for each of the far-infrared cooling lines. These appear as circles. Spitzer has a variety of spectroscopy instruments known collectively as the Infrared Spectrograph (IRS), so many different boxes appear on these galaxies. They are as follows:

Long High Resolution Slit (LH)

Short High Resolution Slit (SH)

Long Low Resolution Slit (LL)

Short Low Resolution Slit (SL)

Further details on these device can be found at http://ssc.spitzer.caltech.edu/obs/. These regions were all extracted at different orientations and with different apertures. All spitzer data was taken from SH extraction sizes unless otherwise specified. They regions inspected visually on top of 8 micron images taken by Spitzer's IRAC camera. Additionally, to account of discrepancies in the apertures, Cliff Johnson made corrections to the line fluxes which are included in the plots.

NGC 0628