ACS Instrument Handbook for Cycle 26
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Advanced Camera for Surveys Instrument Handbook for Cycle 26 > Glossary

Glossary
The following terms and acronyms are used in this Handbook.
 
2MASS: Two Micron All Sky Survey.
ABMAG: –2.5 log (Fν) – 48.60 where Fν is the flux from the source in erg cm–2 sec–1 Hz–1.
ABν: Correction to ABMAG to account for the fact that the source spectrum is not constant in Fν (ABMAG=V+ABν).
ACS: Advanced Camera for Surveys.
ACS-R: Repaired ACS from SM4.
ADC: Analog to digital converter.
Aladin: Interactive sky atlas (http://aladin.u-strasbg.fr).
APT: Astronomer's Proposal Tool.
ASIC: Application-Specific Integrated Circuit in CEB-R.
AstroConda: Software package and management system that provides the tools and utilities required to process and analyze HST data.
aXe: Spectroscopic Data Extraction Software.
BOP: Bright Object Protection.
BOT: Bright Object Tools for SBC proposing.
calacs: ACS calibration pipeline software.
CCD: Charge Coupled Device. Solid-state, light detecting device.
CDS: Correlated Double Sampling mode in CEB-R (dual-slope integration or clamp-and-sample).
CEB: CCD Electronics Box.
CEB-R: New CCD Electronics Box installed during SM4.
CMD: Color Magnitude Diagram.
CP: Call for Proposals.
CR: Cosmic ray.
CR-SPLIT: Division of a CCD exposure into shorter exposures to be used for cosmic ray rejection.
CS: Contact Scientist for a HST proposal.
CTE: Charge transfer efficiency.
CVZ: Continuous viewing zone.
DN: Data number.
DSI: Dual-Slope Integrator.
DSS: Digital Sky Survey.
ETC: Exposure Time Calculator. ETCs are Web-based tools which can be accessed through the ACS webpages.
ERO: Early release observations.
FGS: Fine Guidance Sensors.
FOS: Faint Object Spectrograph.
FOV: Field of view.
FTP: File Transfer Protocol. Basic tool used to retrieve files from a remote system. Ask your system manager for information about using FTP.
FUV: Far ultraviolet (~912 to 2000 Å).
FWHM: Full width at half maximum.
GALEX: Galaxy Evolution Explorer.
GHRS: Goddard High-Resolution Spectrograph.
GO: General Observer.
GSC: Guide Star Catalog.
GSC2: Guide Star Catalog II.
GTO: Guaranteed Time Observer.
Help Desk: Facility for getting help on HST related topics via e-mail. help@stsci.edu.
HRC: High Resolution Channel.
HST: Hubble Space Telescope.
IDT: Investigation Definition Team.
IR: Infrared.
IRAF: Image Reduction and Analysis System. The environment in which ­STSDAS operates.
ISR: Instrument Science Report
IUE: International Ultraviolet Explorer Satellite
K: Degree Kelvin.
L-flats: Low Frequency Variations Flats.
LMC: Large Magellanic Cloud.
LVPS-R: replacement Low Voltage Power Supply.
MAMA: Multi-Anode Microchannel Array.
MAST: STScI Multi-mission Archive.
MCP: Microchannel Plate.
MPP: Multi Pinned Phased, a CCD mode that reduces dark current rate.
NICMOS: Near-Infrared Camera and Multi-Object Spectrograph.
NIR: Near infrared.
NUV: Near ultraviolet (~2000 to 4000 Å).
OTA: Optical Telescope Assembly.
OTFR: On-the-fly re-calibration pipeline that has the ability to select the most up-to-date reference files for science images at the time of request.
PASP: Publications of the Astronomical Society of the Pacific.
PC: Program Coordinator.
Phase I proposal: A proposal for observing time on HST.
Phase II program: An approved HST program; includes precise detail of how program is to be executed.
PI: Principal investigator.
P-flats: pixel-to-pixel high-frequency flats.
POS TARG: POSition TARGet is used to move the sky in the FOV of the camera.
PRF: Pixel Response Function.
PSF: Point-spread function.
PyRAF: version of IRAF implemented in the Python language.
pysynphot: simulates photometric data and spectra as they are observed with HST.
QE: Quantum Efficiency.
QEH: Quantum Efficiency Hysteresis.
Quadrant: Section of detector that is read out by an amplifier. For WFC, there are 4 amplifiers, two for each detector, so each amplifier reads one 2048 x 2048 pixel quadrant.
RA: Right Ascension.
RAS: HST simulator used in ground tests to accurately simulate the full field OTA illumination, and is used to calibrate HST instruments. Also know as RAS/HOMS, the Refractive Aberrated Simulator/Hubble Opto-Mechanical Simulator.
reference file: data file containing ACS parameters or calibration information which is used by the calibration pipeline.
rms: Root mean square.
RQE: Responsive Quantum Efficiency.
SAA: South Atlantic anomaly.
SBC: Solar-Blind Channel.
SDSS: Sloan Digital Sky Survey.
SIDECAR: System Image, Digitizing, Enhancing, Controlling, And Retrieving.
SITe: Scientific Image Technologies; company that designed the ACS CCDs.
SLIM: Slitless Spectroscopy Simulator.
SM4: Servicing Mission 4 to HST in May 2009.
SMOV: Servicing Mission Observatory Verification.
S/N: signal-to-noise ratio.
SNAPSHOT: Short exposures taken during unused blocks of telescope time.
SSDR: Solid state data recorders.
ST-ECF: Space Telescope European Coordinating Facility.
STAN: Space Telescope Analysis Newsletter.
STIS: Space Telescope Imaging Spectrograph.
STScI: Space Telescope Science Institute.
STSDAS: Space Telescope Science Data Analysis System. The complete suite of IRAF data analysis and calibration routines used to process HST data.
TAC: Telescope Allocation Committee.
TECs: Thermal Electric Coolers.
Tiny Tim: PSF simulation software developed by John Krist & Richard Hook.
TIR: Technical Instrument Report.
URL: Uniform resource locator. Address for WWW.
UV: Ultraviolet.
UVIS: Ultraviolet and Visual (CCD channel of WFC3).
WFC: Wide-Field Channel.
WFC3: Wide Field Camera 3, new instrument installed during SM4.
WFPC2: Wide Field Planetary Camera-2. Replacement for WF/PC installed during first servicing mission of December 1993.
WWW: World Wide Web. Hypertext-oriented method for finding and retrieving information over the Internet.

Advanced Camera for Surveys Instrument Handbook for Cycle 26 > Glossary

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