Chandra/CIAO Dictionary
Chandra and CIAO use 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 CIAO.
Here we provide a dictionary of these terms. We have provided
links to more information in the CIAO
webpages, on the CXC site
in general, and in external webpages as appropriate, making the
dictionary a handy place from which to explore. Help on the
CIAO tools is available from the ahelp
documentation page.
- A
- ACIS: Advanced Camera for Imaging and Spectroscopy
- ADU
- Afterglow
- APEC: Astrophysical Plasma Emission Code
- APED: Astrophysical Plasma Emission Database
- ARD: Analysis Reference Data
- ARF: Auxiliary Response File
- asol
- Aspect / Aspect Solution
- ATOMDB: Atomic Database
- B
- Bad Pixels
- BI: Backside Illuminated
- C
- CALDB: Calibration Database
- Continuous Clocking (CC)-mode for ACIS
- Chandra
- ChaRT: The Chandra Ray Tracer
- ChIPS: Chandra Image and Plotting System
- CIAO: Chandra Interactive Analysis of Observations
- Coordinates
- CP: Custom Processing
- CTI: Charge Transfer Inefficiency
- CXC: Chandra X-ray Center
- D
- Data Model (DM)
- Dither
- ds9
- DTCOR
- E
- Effective Area
- Electron Proton Helium Instrument (EPHIN)
- Event
- evt
- Exposure Maps
- EXPOSURE and EXPOSURn
- EXPTIME
- F
- FEF: FITS Embedded Function
- FI: Frontside Illuminated
- FITS: Flexible Image Transport System
- Filter Window (filtwin)
- Firstlook
- flt
- FLSHTIME
- G
- Grade (Event Grade)
- GTI: Good Time Intervals
- GUI
- GUIDE: Grating User Interactive Data Extension
- H
- HETG/HETGS: High Energy Transmission Grating (Spectrometer)
- HRC: High Resolution Camera
- HRMA: High Resolution Mirror Assembly
- I
- img
- Instrument Maps
- ISIS
- L
- LETG/LETGS: Low Energy Transmission Grating (Spectrometer)
- Levels (in Standard Data Processing)
- LIVTIMEn and LIVETIME
- LSF: Line Spread Function
- M
- Mask File
- MDL: Model Descriptor List
- mtl / MTL: Mission Time Line
- O
- OBC: On-Board Computer
- OBI: Observation Interval
- ObsID: Observation Id
- Observation Times
- OGIP: Office for Guest Investigator Programs
- OIF: Observation Index File
- ONTIME and ONTIMEn
- osol
- P
- PCAD: Pointing Control and Determination system
- Pixlib
- PHA: Pulse Height Amplitude
- PHA keywords
- PI: Pulse Invariant
- Pileup
- Pitch
- Platform
- Prism
- PSF: Point Spread Function
- PSF Libraries
- Q
- Quantum Efficiency (QE)
- Quantum Efficiency Uniformity (QEU)
- R
- RMF: Redistribution Matrix File
- Regions
- S
- SDP: Standard Data Processing
- Sherpa
- SIM: Science Instrument Module
- S-Lang
- src
- Stacks
- Status Bits
- Streak Events
- Subspace / Data Subspace
- T
- TCD: Transforms, Convolutions and Deconvolutions
- TIMEDEL
- V
- Virtual Columns
- V&V: Verification and Validation
- VTP: Voronoi Tessalation and Percolation
- W
- WCS: World Coordinate System
- X
- X-rays
- Y
- Yaw
- Z
- z
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