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J104044.4+395710.4

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=0.1381 system is located at 01:40:44.4 +39:57:10.4. The CMD shows an obvious RS, which all spectroscopic members lie on, and the magnitude gap is 3.1 based on SDSS spectroscopic data. The X-ray temperature of the system is T_X=3.5 keV and the X-ray emission peak lies ~3.2 kpc from the FG. The X-ray source is extended with R₂₀₀=1.22 Mpc or ~25R₉₀. The system has a velocity dispersion of
1248 km s^-1 based on 18 galaxies. This system is also known as Abell 1068 and was an XMM target. It is also a cooling-flow cluster with L_X=5×10⁴⁴ erg s^-1 (Quillen et al. 2008).

Fossil System

Fossil Galaxy