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. 9 Sgr in Obsid 6285 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. 9 Sgr in Obsid 6285 is circled in red on the plot.

Hardness Ratios for 9 Sgr, Obsid 6285
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.628	-0.217	-0.744
ACIS-I	-0.591	0.008	-0.585

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 9 Sgr, Obsid 6285

Aimpoint Quantiles 25 % 25 % Error 50 % 50 % Error 75 % 75 % Error
ACIS-S keV 0.737 0.002 0.869 0.001 1.088 0.005

Q-norm 0.057 0.000 0.074 0.000 0.102 0.001
ACIS-I keV 0.796 0.003 0.956 0.007 1.219 0.008

Q-norm 0.064 0.000 0.085 0.001 0.119 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 9 Sgr, Obsid 6285
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.737	0.002	0.869	0.001	1.088	0.005
ACIS-S	Q-norm	0.057	0.000	0.074	0.000	0.102	0.001
ACIS-I	keV	0.796	0.003	0.956	0.007	1.219	0.008
ACIS-I	Q-norm	0.064	0.000	0.085	0.001	0.119	0.001