Table 1.
Properties of four selected Ilustris galaxies with KDCs.
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| # | reff | rmax | M(rmax) | fg0 | rKDC | rKDC/reff | Age(in) | Age(out) | Birth | fg, b | Merger | Ratio | fg, m |
| (kpc) | (kpc) | (1010 M⊙) | (kpc) | (Gyr) | (Gyr) | (Gyr) | (Gyr) | ||||||
| 140593 | 9.1 | 77.8 | 33.3 | 0.01 | 6 | 0.66 | 9.6 | 9.5 | 5.93 | 0.37 | 6.07 | 1:1.0 | 0.52 |
| 353280 | 8.3 | 66.7 | 18.3 | 0.07 | 8 | 0.97 | 5.0 | 7.6 | 4.17 | 0.64 | 4.50 | 1:5.9 | 0.70 |
| 394799 | 4.7 | 40.5 | 6.6 | 0.04 | 7 | 1.50 | 8.1 | 9.1 | 3.73 | 0.23 | – | – | – |
| 354838 | 2.9 | 49.5 | 12.4 | 0.00 | 4 | 1.38 | 8.3 | 9.9 | 6.58 | 0.56 | – | – | – |
Notes. (1) the SubFind ID of the galaxy in the last snapshot of the Illustris-1 run; (2) reff, the effective radius derived as an average of effective radii from de Vaucouleurs’ fits in the three principal planes of the respective galaxy; (3) rmax, the radius approximately corresponding to the surface density of 29 mag arcsec−2, see Sect. 2.1; (4) M(rmax), the stellar mass inside rmax at z = 0; (5) fg0, the gas fraction at z = 0 inside rmax; (6) rKDC, the KDC radius; (7) rKDC/reff, the KDC relative size; (8) the mean mass-weighted age of stellar particles inside the KDC radius rKDC; (9) the mean mass-weighted age of stellar particles between rKDC and rmax; (10) the look-back time of the KDC birth; (11) fg, b, the total gas fraction at the time of the KDC birth; (12) the look-back time of the associated merger (if any), see Sect. 2.3; (13) the stellar-mass ratio of the associated merger; (14) fg, m, the total gas fraction of the associated merger.
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