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. ETA CARINAE in Obsid 3746 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. ETA CARINAE in Obsid 3746 is circled in red on the plot.

Hardness Ratios for ETA CARINAE, Obsid 3746
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	0.724	-0.124	0.659
ACIS-I	0.751	0.218	0.833

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 ETA CARINAE, Obsid 3746

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 1.409 0.019 2.635 0.025 4.241 0.027

Q-norm 0.144 0.002 0.303 0.003 0.512 0.004
ACIS-I keV 1.789 0.017 3.132 0.026 4.592 0.034

Q-norm 0.193 0.002 0.368 0.003 0.557 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 ETA CARINAE, Obsid 3746
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	1.409	0.019	2.635	0.025	4.241	0.027
ACIS-S	Q-norm	0.144	0.002	0.303	0.003	0.512	0.004
ACIS-I	keV	1.789	0.017	3.132	0.026	4.592	0.034
ACIS-I	Q-norm	0.193	0.002	0.368	0.003	0.557	0.004