Chandra X-Ray Observatory
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Last modified: 30 November 2017

Chandra Source Catalog Dictionary


The Chandra Source Catalog uses a number of specialized terms, some of which are common in X-ray astronomy data analysis, but not used elsewhere, and some of which are specific to the Chandra Observatory and CIAO.



A
Alternating Exposure Mode
Aperture Model Energy Fluxes
Aperture Photometry
Aperture Total Counts
ARF: Auxiliary Response Function (or File)
Aspect Histogram
Astronomical Data Query Language (ADQL)
B
Bayesian Blocks
Black Body Model Spectral Fit
Blocking Factor
C
CSCview
CTI: charge transfer inefficiency
Two-sided Confidence Limits
Virtual-Observatory Cone Search
D
Deconvolved Source Extent
Degap Correction for HRC
Direct Flux Algorithm
Dither
Draws
DTCOR: dead time correction
E
Energy Bands
Ensemble
Event
F
Field of View
FITS Standard (ISO 8601) Format Time
Flux Significance
G
Gain
Grade
GTI: Good Time Intervals
H
Hardness Ratio
I
ICRS Right Ascension and Declination
Inter-observation
International Virtual Observatory Alliance (IVOA)
Intra-observation
Per-Observation Detections Table
L
Level 3
Limiting Sensitivity
Livetime
M
Master Sources Table
MCMC
Mission Elapsed Time
MLE
Modified Source Region
O
OBI: Observation Interval
ObsID: Observation Id
P
PHA: Pulse Height Amplitude
PI: Pulse Invariant
Position Angle
Power Law Model Spectral Fit
PSF Aperture Fraction
PSF: Point Spread Function
R
Readout Streak
RMF: Redistribution Matrix Function (or File)
S
Science Energy Bands
Simple Application Messaging Protocol (SAMP)
Source Detection Energy Bands
Source Detection Region
Source Extent
Source Position
Source Region
Stack
Streak Events
T
TGAIN: Time-dependent Gain Correction
W
wavdetect

Last modified: 30 November 2017
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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.