Published March 28, 2024
| Version v1
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[NGC3079 / UGC5101] SAUNAS: I. Searching for low surface brightness X-ray emission with Chandra/ACIS
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Description
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 [ - ]
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.
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