Radial profiles

Radial profiles of (left) the surface brightness and (right) the gas temperature measured by two spatial binning methods, (top) annulus binning (AB) and (bottom) weighted Voronoi tessellation binning (WB). The surface brightness is determined by L_X,GAS (10⁴⁰ erg sec^-1) in a given bin divided by the area (arcmin²) of the bin. The black points with error bars are the measured values.

The thick-dashed purple lines indicate (left) the X-ray luminosity of the hot gas within r, L_X,GAS (< r) in 10⁴⁰ erg sec^-1, determined by summing L_X,GAS from all bins within the specified radius and (right) the temperature of the hot gas within r, T(< r), determined by L_X-weighted averaging log(T) from all bins within the specified radius, as noted in section 5.2.

The vertical lines indicate r = 5 arcsec (red), r = 1 and 5 x R_e (cyan) and r = R_MAX (blue) which is the maximum radius where the hot gas is reliably detected with an azimuthal coverage larger than 95% (see section 5.2). The horizontal lines in the right panel are overlaid to indicate the T grids at 1 keV (red); 0.5, 0.8, 1.2, 1.5, and 1.8 keV (blue); and intermediate values between 1.1 and 1.9 keV in green.

Additionally, the top label includes the following information: galaxy name, merge id, binning method (AB or WB followed by n_m where n=1, 2, 3 indicates S/N=50, 30, 20 respectively and m=1 indicates the abundance is fixed at solar), distance (in Mpc), linear scale in kpc of 1 arcmin, effective radius (R_e in kpc), semi-major and semi-minor axes in kpc of the D₂₅ ellipse.

The figure can be enlarged or zoomed-in for better viewing.