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 3 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 3 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 3
Aimpoint HR1 = (H-M)/(H+M) HR2 = (M-S)/(M+S) HR3 = (H-S)/(H+S)
ACIS-S 0.016 0.526 0.537
ACIS-I 0.056 0.646 0.677

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 3
Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 1.059 0.003 1.409 0.000 1.978 0.007
Q-norm 0.099 0.000 0.144 0.000 0.218 0.001
ACIS-I keV 1.117 0.002 1.467 0.007 2.037 0.007
Q-norm 0.106 0.000 0.152 0.001 0.226 0.001

Observation Preview Chandra Configuration for the Observation
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