X-ray Hardness

Convolved/Predicted ACIS-S hardness plot

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. Theta-1 Ori C in Obsid 2568 is circled in red on the plot.
Download plot: GIF PS
Download plot data: Text file
View complete listing of X-Atlas Spectral Metrics (Hardness, Quantiles).


Convolved/Predicted ACIS-I hardness 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. Theta-1 Ori C in Obsid 2568 is circled in red on the plot.
Download plot: GIF PS
Download plot data: Text file
View complete listing of X-Atlas Spectral Metrics (Hardness, Quantiles).


Hardness Ratios for Theta-1 Ori C, Obsid 2568
Aimpoint HR1 = (H-M)/(H+M) HR2 = (M-S)/(M+S) HR3 = (H-S)/(H+S)
ACIS-S 0.024 0.475 0.493
ACIS-I 0.068 0.614 0.655

X-ray Quantiles

Convolved/Predicted ACIS-S Aimpoint Quantile gridACIS-S hot stars JPG Postscript Convolved/Predicted ACIS-S Aimpoint Quantile gridACIS-S cool stars JPG Postscript
Convolved/Predicted ACIS-I Aimpoint Quantile gridACIS-I hot stars JPG Postscript Convolved/Predicted ACIS-I Aimpoint Quantile gridACIS-I cool stars JPG Postscript
Quantile-based color-color diagram: (m = Q50 = (E50 - Elo)/(Ehi - Elo)). Elo = 0.3 keV; Ehi = 8.0 keV
View complete listing of X-Atlas Spectral Metrics (Hardness, Quantiles).

Quantiles for Theta-1 Ori C, Obsid 2568
Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 1.029 0.000 1.394 0.001 1.993 0.003
Q-norm 0.095 0.000 0.142 0.000 0.220 0.000
ACIS-I keV 1.102 0.001 1.467 0.007 2.081 0.009
Q-norm 0.104 0.000 0.152 0.001 0.231 0.001

Observation Preview Chandra Configuration for the Observation
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