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. KPD0005+5106 in Obsid 976 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. KPD0005+5106 in Obsid 976 is circled in red on the plot.

Hardness Ratios for KPD0005+5106, Obsid 976
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	0.379	-0.233	0.161
ACIS-I	0.438	0.228	0.606

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 KPD0005+5106, Obsid 976

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.694 0.009 1.365 0.013 2.986 0.024

Q-norm 0.051 0.001 0.138 0.002 0.349 0.003
ACIS-I keV 1.102 0.015 1.964 0.039 3.424 0.028

Q-norm 0.104 0.002 0.216 0.005 0.406 0.004

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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 KPD0005+5106, Obsid 976
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.694	0.009	1.365	0.013	2.986	0.024
ACIS-S	Q-norm	0.051	0.001	0.138	0.002	0.349	0.003
ACIS-I	keV	1.102	0.015	1.964	0.039	3.424	0.028
ACIS-I	Q-norm	0.104	0.002	0.216	0.005	0.406	0.004