J123338.5+374114.9
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=0.1023 system is located at
12:33:38.5 +37:41:14.9. Again, there are very few galaxies in the
vicinity of the FG, however, the CMD shows the hint of an RS. The only
spectroscopic system member (the FG) lies on the RS and the magnitude
gap is 3.2 based on SDSS photometric data. The rejected galaxy is
~11100 km s-1 away from the FG. The X-ray temperature
of the system is TX=0.9 keV and the X-ray emission peak
lies ~21.6 kpc from the FG. The X-ray source is extended with
R200=0.58 Mpc or ~30R90. No velocity
dispersion could be measured for this system.
Fossil System
| XCS ID | Δm14 | R200 | LX | TX | Ltot | ΣL24 |
|---|
| XMMXCS J123338.5+374114.9 | 3.2 | 0.58 | 0.03 | 0.9 | 0.95 | 0.142 |
Fossil Galaxy
| SDSS ID | z | M∗ | Age | Z | log(SSFR) | Lgal |
|---|
| J123337.74+374122.0 | 0.1023 | 0.33 | 11.8 | 0.026 | -12.30 | 0.81 |