Glossary The following terms and acronyms are used in this Handbook. ADC: Analog to digital 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 APT: Astronomer’s Proposal Tool aXe: Spectroscopic Data Extraction Software BOP: Bright Object Protection calacs: ACS calibration pipeline software CCD: Charge Coupled Device. Solid-state, light detecting device 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 CTE: Charge transfer efficiency CVZ: Continuous viewing zone DN: Data number ETC: Exposure Time Calculator. ETCs are Web-based tools which can be accessed through the ACS Web pages. 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) 255 256 Glossary FWHM: Full width at half maximum GALEX: Galaxy Evolution Explorer GHRS: Goddard High-Resolution Spectrograph GO: General Observer GSC: Guide Star Catalog GSCII: Guide Star Catalog II GTO: Guaranteed Time Observer Help Desk: Facility for getting help on HST related topics via email. [email protected] 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 MAMA: Multi-Anode Microchannel Array MCP: Microchannel Plate MPP: Multi Pinned Phased, a CCD mode that reduces dark current rate NICMOS: Near-Infrared Camera and Multi-Object Spectrograph NUV: Near ultraviolet (~2000 to 4000 Å) OTA: Optical Telescope Assembly 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 PRF: Pixel Response Function PSF: Point-spread function. PyRAF: version of IRAF implemented in the Python language Glossary 257 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 SITe: Scientific Image Technologies; company that designed the ACS CCDs SLIM: Slitless Spectroscopy Simulator SMOV: Servicing Mission Observatory Verification S/N: signal-to-noise ratio SNAPSHOT: Short exposures taken during unused blocks of telescope time. 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. synphot: STSDAS synthetic photometry (IRAF) software package TAC: Telescope Allocation Committee TECs: Thermal Electric Coolers Tiny Tim: PSF simulation software developed by John Krist & Richard Hook URL: Uniform resource locator. Address for WWW. UV: Ultraviolet 258 Glossary WFC: Wide-Field Channel 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.