J092540.0+362711.1
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=0.1121 system is located at
09:25:40.0 +36:27:11.1. The CMD shows an RS and all spectroscopic
members lay on it. The magnitude gap is 2.8 based on SDSS photometric
data. The rejected galaxy lies ~7800 km s-1 away from
the FG. The X-ray emission has TX=3.0 keV and the peak lies
~26.1 kpc from the FG. The X-ray source is extended with
R200=1.14 Mpc or ~40R90. Increasing
R200 by its error would decrease the magnitude gap by 0.3
but the system would still be classified as a fossil. We note that
there is a bright galaxy just outside 0.5R200 that would
change Δm14 if it were included. The system has a
velocity dispersion of 435 km s-1 based on 22 galaxies.
Fossil System
| XCS ID | Δm14 | R200 | LX | TX | Ltot | ΣL24 |
|---|
| XMMXCS J092540.0+362711.1 | 2.8 | 1.14 | 1.03 | 3.0 | 4.53 | 0.61 |
Fossil Galaxy
| SDSS ID | z | M∗ | Age | Z | log(SSFR) | Lgal |
|---|
| J092539.05+362705.5 | 0.1121 | 0.75 | 11.3 | 0.030 | -12.31 | 2.24 |