J160129.8+083856.3
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=0.1875 system is located at
16:01:29.8 +08:38:56.3. The CMD shows no sign of an RS and the
magnitude gap is 3.1 based on SDSS photometric data. Increasing
R200 by its error would decrease the magnitude gap by 0.3
but the system would still be classified as an FS. We note that there
is a bright galaxy just outside 0.5R200 that would change
Δm14 if it were included. The X-ray temperature of
the system is TX=1.7 keV and the X-ray emission peak lies
~18.1 kpc from the FG. The X-ray source is extended with
R200=0.77 Mpc or ~35R90. No velocity
dispersion could be measured for this system.
Fossil System
| XCS ID | Δm14 | R200 | LX | TX | Ltot | ΣL24 |
|---|
| XMMXCS J160129.8+083856.3 | 3.1 | 0.77 | 0.84 | 1.7 | 2.77 | 0.45 |
Fossil Galaxy
| SDSS ID | z | M∗ | Age | Z | log(SSFR) | Lgal |
|---|
| J160129.75+083850.6 | 0.1875 | 1.02 | 11.3 | 0.028 | -12.50 | 1.71 |