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. BETA CRU in Obsid 2575 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. BETA CRU in Obsid 2575 is circled in red on the plot.

Hardness Ratios for BETA CRU, Obsid 2575
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.888	-0.711	-0.980
ACIS-I	-0.865	-0.525	-0.956

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 BETA CRU, Obsid 2575

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.577 0.001 0.694 0.005 0.825 0.002

Q-norm 0.036 0.000 0.051 0.001 0.068 0.000
ACIS-I keV 0.635 0.002 0.767 0.002 0.913 0.007

Q-norm 0.044 0.000 0.061 0.000 0.080 0.001

Observation Preview

Chandra Configuration for the Observation

Return to Search Page

X-Atlas Home

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 BETA CRU, Obsid 2575
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.577	0.001	0.694	0.005	0.825	0.002
ACIS-S	Q-norm	0.036	0.000	0.051	0.001	0.068	0.000
ACIS-I	keV	0.635	0.002	0.767	0.002	0.913	0.007
ACIS-I	Q-norm	0.044	0.000	0.061	0.000	0.080	0.001