View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
335	2000-03-05 23:19:11	NGC 4151	IRAS Z12080+3940	Seyfert 1 Galaxy	Sa D ~	-0.7000	182.635740	39.405890	47423.79

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
11030	0.2326	severe

The zeroth-order image for NGC 4151

Hardness Ratios and Quantiles

Hardness ratios and quantiles are calculated from the predicted ACIS-S or ACIS-I aimpoint spectra, as indicated.

Hardness Ratios
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	0.751	-0.200	0.648
ACIS-I	0.798	0.129	0.840

S, M, and H represent the predicted total counts in the following passbands:

S: 0.3-0.9 keV

M: 0.9-1.5 keV

H: 1.5-8.0 keV

Quantiles
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	1.394	0.011	3.570	0.010	4.884	0.009
ACIS-S	Q-norm	0.142	0.001	0.425	0.001	0.595	0.001
ACIS-I	keV	2.446	0.018	3.964	0.009	5.205	0.010
ACIS-I	Q-norm	0.279	0.002	0.476	0.001	0.637	0.001

Normalized quantiles (Q-norm) are defined as:

Q_x = (E_x - E_lo)/(E_hi - E_lo)

Where E_lo = 0.3 keV and E_hi = 8.0 keV.

Hardness Ratio plots and Quantile-based Color-Color Diagrams

X-Atlas Hardness Ratios and Quantiles Listing

Spectral Metrics

A series of line-line, line-continuum, and continuum-continuum ratios calculated from the high-resolution 1^st order MEG or LEG spectrum.

Line-Line Ratios
Ne X / O VIII	Ne2O Error	O VII(i) / O VII(f)	Oif Error	O VII(r) / O VIII	O78 Error	O VIII / Fe XVII	O8Fe Error	Mg XII / Fe XVII	Mg2Fe Error	Si XIV / Fe XVII	Si2Fe Error	S XV / Fe XVII	S2Fe Error
1.6960	0.7013	0.0000	0.0000	0.0000	0.0000	4.3927	8.5958	12.6654	24.5918	1.1303	2.3688	0.9909	2.0653

short line / cont

Line-Continuum & Continuum-Continuum Ratios
sl2c Error	long line / cont	ll2c Error	line / cont	l2c Error	cont long / cont short	cl2cs Error	cont long / cont med	cl2cm Error	cont med / cont short	cm2cs Error
0.0874	0.0054	0.0106	0.0033	0.1010	0.0063	0.1055	0.0005	0.1739	0.0008	1.5397	0.0053

X-Atlas Spectral Metrics Listing

Spectral Fits

Image File Missing: 2T xsmekal zeroth-order fit
Mewe-Kaastra-Liedahl 2-temperature fit of the low-resolution zeroth-order spectrum of NGC 4151.
Warning: The zeroth-order spectrum may be subject to distortions from pileup.

Aimpoint

Model

nH (10²²/cm³)

nH error

kT (keV)

kT error

kT2 (keV)

kT2 error

Abundance (solar)

Abundance error

Flux (ergs/cm²/s)

Flux Emission Ratio (kT2/kT1)

Reduced Chi²

DoF

zeroth-order

xswabs*(xsmekal1+xsmekal2)

0.000

50.000

1.000

1.50

4.43973e-12

12.85

372

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	0.560
Prob.	0.784
Var. Index	5

HETG light curve for NGC 4151, constructed from all ±1^st, ±2^nd, and ±3^rd order HETG events.

HETG HEG Spectrum

Image File Missing: High-Resolution 1st Order HEG spectrum of obsid 335

High-Resolution 1st Order HEG Spectrum for NGC 4151

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 335

High-Resolution 1st Order MEG Spectrum for NGC 4151

X-Atlas Data Products

Spectral Data
PHA II	HEG ±1^st Order PHA	HEG ±1^st Order gARF	MEG ±1^st Order PHA	MEG ±1^st Order gARF	[Counts/s/Å] FITS	[Counts/s/Å] text	[ph/s/Å/cm²] FITS	[ph/s/Å/cm²] text

Standard Data Products (Cycle 06)
Aimpoint ARF		Aimpoint RMF
ACIS-S	ACIS-I	ACIS-S	ACIS-I

Retrieve observation data from the Chandra Data Archive: WebChaSeR

Target Preview