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. HD 93129AB in Obsid 7229 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. HD 93129AB in Obsid 7229 is circled in red on the plot.

Hardness Ratios for HD 93129AB, Obsid 7229
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.301	0.120	-0.188
ACIS-I	-0.271	0.355	0.093

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 HD 93129AB, Obsid 7229

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.836 0.008 1.088 0.010 1.467 0.016

Q-norm 0.070 0.001 0.102 0.001 0.152 0.002
ACIS-I keV 0.927 0.011 1.190 0.013 1.555 0.018

Q-norm 0.081 0.001 0.116 0.002 0.163 0.002

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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 HD 93129AB, Obsid 7229
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.836	0.008	1.088	0.010	1.467	0.016
ACIS-S	Q-norm	0.070	0.001	0.102	0.001	0.152	0.002
ACIS-I	keV	0.927	0.011	1.190	0.013	1.555	0.018
ACIS-I	Q-norm	0.081	0.001	0.116	0.002	0.163	0.002