X-ray Hardness and Quantiles

Hardness ratios calculated from the predicted ACIS-S Aimpoint spectra of selected X-Atlas targets (× = hot star; ◊ = cool star). S, M, and H are the total predicted counts in the passbands listed on the plot. AR LAC-6 LAST QUAD (2) in Obsid 11 is circled in red on the plot.

Hardness ratios calculated from the predicted ACIS-I Aimpoint spectra of selected X-Atlas targets (× = hot star; ◊ = cool star). S, M, and H are the total predicted counts in the passbands listed on the plot. AR LAC-6 LAST QUAD (2) in Obsid 11 is circled in red on the plot.

Hardness Ratios for AR LAC-6 LAST QUAD (2), Obsid 11
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.470	0.083	-0.402
ACIS-I	-0.422	0.305	-0.134

X-ray Quantiles

Quantile-based color-color diagram: (m = Q₅₀ = (E₅₀ - E_lo)/(E_hi - E_lo)). E_lo = 0.3 keV; E_hi = 8.0 keV

View complete listing of X-Atlas Spectral Metrics (Hardness, Quantiles).

Quantiles for AR LAC-6 LAST QUAD (2), Obsid 11

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.796 0.003 0.986 0.001 1.292 0.007

Q-norm 0.064 0.000 0.089 0.000 0.129 0.001
ACIS-I keV 0.883 0.002 1.059 0.002 1.424 0.007

Q-norm 0.076 0.000 0.099 0.000 0.146 0.001

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ACIS-S hot stars JPG Postscript	ACIS-S cool stars JPG Postscript
ACIS-I hot stars JPG Postscript	ACIS-I cool stars JPG Postscript

Quantiles for AR LAC-6 LAST QUAD (2), Obsid 11
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.796	0.003	0.986	0.001	1.292	0.007
ACIS-S	Q-norm	0.064	0.000	0.089	0.000	0.129	0.001
ACIS-I	keV	0.883	0.002	1.059	0.002	1.424	0.007
ACIS-I	Q-norm	0.076	0.000	0.099	0.000	0.146	0.001