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J015315.0+010214.2

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=0.0597 system is located at 01:53:15.0 +01:02:14.2. The CMD shows an obvious RS, which all spectroscopic members lie on, and the magnitude gap is 2.7 based on SDSS photometric data, i.e. not all of the four brightest galaxies have a spectroscopic redshift. However, the two galaxies that only have photometric redshifts both lie on the RS as well. The X-ray temperature of the system is T_X=1.1 keV and the X-ray emission peak lies ~8.6 kpc from the FG. The system is located near the edge of the SDSS footprint but at a distance of ~1.4R₂₀₀ both Δm₁₄ and L_tot should be unaffected. The X-ray source is extended with R₂₀₀=0.66 Mpc or ~30R₉₀. The system has a velocity dispersion of 266 km s^-1 based on 18 galaxies.

Fossil System

Fossil Galaxy