Open Access
Table 1
Summary of assumptions, corrections, and systematics.
| Assumptions, corrections and systematics | Description and our approach(∗) |
|---|---|
| Temperature and metallic- ity profiles | Radial variation of temperature and metallicity need to be accounted for to have reliable thermodynamic profiles of galaxy groups. Given the limited signal-to-noise we have for most of the groups in our sample, we adopt the average shape of the temperature profiles of the galaxy groups presented in S09 and allow its normalization to vary for deriving the average thermodynamic properties of our sample. Furthermore, we adopt the average Mernier et al. (2017) metallicity profile for the main results and conservatively consider the reported scatter as the systematic uncertainty of the profile. We then propagate the systematic uncertainty to our final results and consider its impact as part of the total error budget. |
| Instrumental calibration | A flux mismatch of 15% is reported in Bulbul et al. (2024) between eROSITA and Chandra for galaxy clusters and groups. Assuming the flux mismatch is not a function of radii, this discrepancy corresponds to an 8% difference in ne and a 5% difference in S . In this work, we take the mismatch into account while comparing our results with the measurements in the literature with other telescopes. |
| Mass measurements | Obtaining the underlying mass distributions of galaxy groups are challenging and may lead to inconsistencies while comparing measurements. In this work, we account for the mass measurement mismatches while comparing our results with the literature and provide derivatives of our entropy measurements for future work to account for the mass measurement systematic while comparing with our results. |
| Atomic databases | Spectral models evolve over time as our knowledge of atomic transitions increases. This may result in discrepancies when measurements obtained with different atomic database versions are compared. In this work, we account for this by applying corrections to the measurements in the literature. |
Notes. (∗)See Sect. 4 for a more detailed description of the assumptions, corrections, and systematics, along with a more detailed prescription on how they are addressed in this study.
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