8 μm image of NGC 45 taken by the Infrared Array Camera (IRAC) aboard the Spitzer Infrared Space Telescope. The green circles indicate the locations of sources detected by the merged observation while the magenta circle corresponds to source CXOU J001404.6–231355, the source that was detected in the ObsID 4690 observation but not in the merged observation. The location of the background galaxy cluster CXOU J001354.2-231254.7 is indicated with a white circle with a radius of 40 arcsec corresponding to the radius of the X-ray spectral extractions. See also Sections 3 and 6.