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J101703.6+390250.7

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=0.2056 system is located at 10:17:03.6 +39:02:50.7. The CMD shows the hint of an RS and both spectroscopic members lay on it. The magnitude gap is 2.7 based on SDSS photometric data. The X-ray emission has T_X=6.6 keV (the highest of any system) and the peak lies ~4.6 kpc from the FG. The X-ray source is extended with R₂₀₀=1.63 Mpc (the largest of any system) or ~30R₉₀. 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 1013 km s^-1 based on 10 galaxies. This system is also known as Abell 0963 and was an XMM target. From the literature, L_X=6.1×10⁴⁴ erg s^-1 (Soltan & Henry 1983, half of that found here), σ;=1350±200 km s^-1 (Lavery & Henry 1998). It is an X-ray lensing cluster that is unusually relaxed with <5% substructure (Smith et al. 2005).

Fossil System

Fossil Galaxy