J123024.3+111127.8
Link to XCS-DR1 entry
 |  |
| Fig. 1: The SDSS optical image with the XCS X-ray contours overlaid. | Fig. 2: The colour-magnitude diagram used to determine the magnitude gap. Green triangles are spectroscopic cluster members and circles are photometric cluster members. Red triangles are spectroscopic non-members. Only cluster members within ±0.2 mag of the r-i colour of the fossil galaxy (dotted lines) are used to calculate the gap. The two diamonds denote the second and the fourth brightest galaxy. |
Notes
This z=0.1169 system is located at
12:30:24.3 +11:11:27.8. There are very few galaxies in the vicinity of
the FG, however, those that are have redshifts (one spectroscopic and
two photometric) that place them at the same redshift. The CMD shows
the hint of an RS, which both spectroscopic members lie on, and the
magnitude gap is 3.5 (the largest of any system) based on SDSS
photometric data. The X-ray temperature of the system is
TX=0.8 keV and the X-ray emission peak lies ~15.6 kpc
from the FG. The X-ray source is extended with R200=0.54
Mpc or ~20R90, but is located close to the edge of an
XMM field. We note that there is a bright galaxy just outside
0.5R200 that would change Δm14 if it were
included. No velocity dispersion could be measured for this
system.
Fossil System
| XCS ID | Δm14 | R200 | LX | TX | Ltot | ΣL24 |
|---|
| XMMXCS J123024.3+111127.8 | 3.5 | 0.54 | 0.018 | 0.80 | 1.61 | 0.39 |
Fossil Galaxy
| SDSS ID | z | M∗ | Age | Z | log(SSFR) | Lgal |
|---|
| J123024.67+111122.8 | 0.1169 | 0.37 | 10.9 | 0.021 | -11.96 | 1.27 |