[NGC3079 / UGC5101] SAUNAS: I. Searching for low surface brightness X-ray emission with Chandra/ACIS

The contained FITS files represent the processed Chandra/ACIS X-ray surface brightness maps of the NGC3079 and UGC5101 galaxies, observed with Chandra/ACIS and analyzed with the SAUNAS pipeline as described in Borlaff et al. 2024 (in revision). All the images have the photometric calibrations (in units of photons cm-2 s-1 pixel-1) and have been astrometrically aligned. 

Each file contains four FITS extensions as detailed below: 

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EXTENSION NAME           TYPE              SIZE               DETAILS               

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0      INFO                         no-data         0                      BLANK EXTENSION. 1      SB_FLUX                  float64         512x512           X-RAY SURFACE BRIGHTNESS MAP. [photons cm-2 s-1 pixel-1] 2      STD_SB_FLUX        float64         512x512           X-RAY SURFACE BRIGHTNESS NOISE MAP [photons cm-2 s-1 pixel-1]3      SNR                         float64         512x512           SIGNAL-TO-NOISE RATIO [ - ]

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Use the SNR extension (extension #3) to determine if your source of interest in the SB_FLUX map (extension #1) is statistically significant over the background limit.