J134825.6+580015.8

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=0.1274 system is located at 13:48:25.6 +58:00:15.8. The CMD shows an obvious RS, which the only spectroscopic members (the FG) lies on, and the magnitude gap is 2.6 based on SDSS photometric data. The rejected galaxy is ~10000 km s^-1 away from the FG. The X-ray temperature of the system is T_X=1.6 keV and the X-ray emission peak lies ~7.4 kpc from the FG. The X-ray source is extended with R₂₀₀=0.78 Mpc or ~20R₉₀, but it is located near the edge of the XMM chip. The system has a velocity dispersion of 526 km s^-1 based on 5 galaxies.

Fossil System

XCS ID	Δm₁₄	R₂₀₀	L_X	T_X	L_tot	ΣL₂₄
XMMXCS J134825.6+580015.8	2.6	0.78	0.08	1.6	3.55	0.37

Fossil Galaxy

SDSS ID	z	M_∗	Age	Z	log(SSFR)	L_gal
J134825.78+580018.7	0.1274	0.59	8.5	0.033	-11.77	2.35

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