Table 4.
Fitting results for the distributions of photon indices.
| Population | ⟨ΓX⟩ | σΓX | ⟨ΓX, Comastri⟩ | ⟨ΓX, Donato⟩ | ⟨ΓX, Kadler⟩ | ⟨ΓX, Giommi⟩ |
|---|---|---|---|---|---|---|
| Reference | 1 | 2 | 3 | 4 | ||
| All | 2.05 | 0.42 | – | – | – | – |
| Confirmed | 2.08 | 0.43 | – | – | – | – |
| Candidates | 1.99 | 0.42 | – | – | – | – |
| BLL | 2.26 | 0.38 | 2.43 ± 0.21 | 2.28 ± 0.04*, 2.39 ± 0.08** | ∼1.4 − 2.5 | ∼2.0 |
| FSRQ | 1.80 | 0.37 | 1.67 ± 0.13 | 1.76 ± 0.06 | 1.61 ± 0.20* * * | ∼1.6 |
| BCU | 2.08 | 0.39 | – | – | – | – |
| BLLC | 2.07 | 0.42 | – | – | – | – |
| FSRQC | 1.89 | 0.42 | – | – | – | – |
| BCUC | 1.96 | 0.41 | – | – | – | – |
| 4FGL | 2.12 | 0.44 | – | – | – | – |
| Non-4FGL | 2.00 | 0.40 | – | – | – | – |
| HSP | 2.28 | 0.35 | – | – | – | – |
| ISP | 2.32 | 0.39 | – | – | – | – |
| LSP | 1.75 | 0.36 | – | – | – | – |
Notes. We fit the distributions in Fig. 12 assuming a gaussian distribution and list the mean values and the standard deviations and values from the literature. * HBLs, ** LBLs, * * * their value for quasars. (1) Comastri et al. (1997); (2) Donato et al. (2001); (3) Kadler (2005); (4) Giommi et al. (2019).
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