Table 8.
Best-fit parameters of the Chandra spectra of M 87 in the 0.3−10 keV range using the following four models: tbabs*power, tbabs*bbody, tbabs*(bbody+power) and tbabs*bmc.
| Parameter | 11514 | 18783 | 21075 | |
|---|---|---|---|---|
| Model | ||||
| tbabs | NH (×1020 cm−2) | 4.03 ± 0.01 | 5.4 ± 0.6 | 7.2 ± 0.1 |
| Power-law | Γpow | 1.98 ± 0.06 | 2.18 ± 0.07 | 1.96 ± 0.07 |
| Npow(†) | 4.3 ± 0.3 | 1.9 ± 0.2 | 7.1 ± 0.1 | |
 (d.o.f.) |
0.76 (113) | 0.62 (174) | 0.65 (176) | |
| tbabs | NH (×1020 cm−2) | 0.09 ± 0.01 | 0.08 ± 0.03 | 0.06 ± 0.01 |
| Bbody | TBB (keV) | 0.47 ± 0.02 | 0.50 ± 0.01 | 0.62 ± 0.02 |
| NBB(†) | 0.14 ± 0.09 | 0.07 ± 0.01 | 0.27 ± 0.03 | |
 (d.o.f.) |
2.73 (113) | 1.95 (174) | 1.49 (176) | |
| tbabs | NH (×1020 cm−2) | 3.9 ± 0.6 | 3.3 ± 0.1 | 3.9 ± 0.6 |
| Bbody | TBB (keV) | 0.45 ± 0.09 | 0.28 ± 0.03 | 0.44 ± 0.09 |
| NBB(†) | 0.10 ± 0.08 | 0.02 ± 0.01 | 0.05 ± 0.01 | |
| Power-law | Γpow | 1.96 ± 0.09 | 1.88 ± 0.05 | 1.83 ± 0.09 |
| Npow(†) | 4.4 ± 0.3 | 1.26 ± 0.6 | 5.2 ± 0.1 | |
 (d.o.f.) |
0.79 (111) | 0.59 (172) | 0.86 (174) | |
| tbabs | NH (×1020 cm−2) | 1.0 ± 0.1 | 7.4 ± 0.5 | 1.0 ± 0.2 |
| bmc | Γbmc | 1.94 ± 0.07 | 2.83 ± 0.09 | 2.09 ± 0.07 |
| Ts (eV) | 136 ± 7 | 168 ± 10 | 220 ± 9 | |
| log A | 1.08 ± 0.02 | −2.29 ± 0.07 | 1.47 ± 0.05 | |
| Nbmc(†) | 0.10 ± 0.04 | 0.50 ± 0.04 | 0.17 ± 0.05 | |
 (d.o.f.) |
0.87 (111) | 1.01 (172) | 0.96 (174) | |
Notes. Errors are given at the 90% confidence level. (†)Normalization parameters of blackbody and bmc components are in units of 
erg s−1 kpc−2, where 
is soft photon luminosity in units of 1035 erg s−1, d10 is the distance to the source in units of 10 kpc. TBB and Ts are the temperatures of the blackbody and seed photon components, respectively (in keV and eV). Γpow and Γbmc are the indices of the power law and bmc, respectively.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.