Table 1.
Velocity dispersion estimates from the PN sample in the outer region of M 87.
| R | σhalo+ICL | σrobust halo | σhalo no crown |
|---|---|---|---|
| (kpc) | (km s−1) | (km s−1) | (km s−1) |
| 20 | 243.6 ± 69.5 | 256.7 ± 33.1 | 269.1 ± 34.7 |
| 45 | 358.5 ± 70.0 | 301.7 ± 23.3 | 284.0 ± 22.7 |
| 70 | 506.4 ± 57.5 | 248.3 ± 26.5 | 290.6 ± 32.1 |
| 90 | 691.8 ± 61.0 | 361.7 ± 26.5 | 362.6 ± 30.4 |
| 120 | 794.6 ± 67.8 | 328.1 ± 37.1 | 254.6 ± 36.7 |
| 170 | – | 154.6 ±36.4 | 126.9 ± 36.6 |
Notes. Column 1: major axis distance. Columns 2, 3, and 4: velocity dispersions and their uncertainties for the M 87 halo and IC PNs, the M 87 halo PNs from the robust estimate of Longobardi et al. (2015a), and the M 87 halo PNs with the crown PNs statistically subtracted (see text for details).
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