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Astrogrid Web > DocStore > OntologyDocs > OntologyUserData
Astrogrid Web > DocStore > OntologyDocs > OntologyUserData Ontology User Data
Introduction: In order to determine the best way to organize the ontology class structure, Elizabeth Auden and Anita Richards are interviewing astronomers about their fields of study, the data used, and sources of data. The astronomers answer the following 10 questions; results of the interviews (categorized by disclipline) are given below.
Questions:
-- ElizabethAuden - 10 Jul 2002
-- AnitaRichards - 17 Jul 2002
- What is your discipline?
- What wavelengths, energies and/or particles do you study?
- What types of datafiles do you use (ie spectra,images, etc...)?
- What kinds of objects do you study?
- What kinds of events do you study?
- Which position / coordinate systems do you use?
- Which time systems do you use?
- What kinds of accuracy flags are available for your data?
- Which satellites / g-b telescopes produce your data?
- Which software and analysis packages do you use?
| Discipline | Radio | Microwave | IR | Optical | UV | X-Ray | Gamma Ray | Solar | STP |
| Wavelengths Energies Particles | Interferometry 0.15 - > 100 GHz CMB: 30-860 GHz + foregrounds radio, microwave, optical, IR and X-ray. Halpha. PSR: radio - gamma-rays |
radio, submm, mm, IR | 2 - 670 micron | B, V | X-ray, UV, Far Red, Near IR | Gamma rays Hard, soft x-rays UV, B, R, V radio |
X-ray, EUV Hard X-ray, optical Nickel lines |
Radio, Optical, UV, X-Ray electrostatic and magentic fields and waves ULF to 100's kHz electrons, protons, He+, He++, O+, O++, others e.g. Fe3+ to Fe16+ Few eV to GeV? |
|
| Data Files | Visibilities, images, multi-freq data/products: binary FITS. Spectra, time-series, source etc. lists: ASCII or FITS Multi-freq. data/products CMB: Spectra, images, power spectra |
Visibility data, images, spectra, spectro-spatial cubes FITS, ASCII lists, Class files PSR: Time series, images, high energy spectra, Fast-sampled filterbank data (1-16 bits per sample; 32-1024 channels) |
Spectra (1- - 3-D), images FITS; photometric tables (ISO); ASCII lists (IRAS) |
.fits (text tables / images) | Spectra (images) light curves (images) images .fits format |
Spectra (images) light curves (images) images .fits format |
Spectra (images) light curves (images) Zeeman spectra (images) magnetograms(images) energy spectra (images) solar images event lists (text) solar datacubes (images) |
Scaler, vector, image and higher dimensionality products and time series of theses. Event lists and catalogues. CDF, IDFS, various ad-hoc ASCII and binary formats. | |
| Objects | ISM & Nebulae. Stars: YSO, active, evolved. Active galaxies: starburst, AGN. Very young radio sources. Cluster of galaxies. CMB and ISM (Galaxy), HII regions, radio recombination lines, extra-galactic sources. PSR: Neutron stars, SNR, unidentified EGRET point sources. Single dish: HI in Galaxies: General, Low Surface Brightness |
Young stars, molecular clouds | Stars: main sequence, late-type. Dark clouds. Dust: ISM, circumstellar, Zodiacal. Star-forming regions. Solar system bodies. | variable stars | non-magnetic catastrophic variables AGN's |
supernovae Lyman alpha forest DLA's |
Full Sun disk chromosphere photosphere active regions quiet sun |
Solar wind, upstream region, bow shock, magnetopause, magnetosphere, cusp, mantle, magnetotail, lobes, ring current, plasmasphere, ionosphere. (Note: it would be more accurate to call these regions rather than objects corresponding to a set of plasma conditions or where a particular set of processes is taking place). | |
| Events | Emission mechanisms: thermal, non-thermal. Spectral lines: HI, maser. Gravitational lensing. Ejection of matter & energy - winds & jets Bursting radio sources, extreme synchrotron sources The Big Bang and gas & dust thermal & non-thermal emission mechanisms. Sunyaev-Zeldovich effect PSR: Supernova explosions. Environment, Galactic structure and stellar evolution |
The formation of stars | Star birth & death. Stellar & dust variability. Mass loss episodes. | Accretion streams Magnetic field interactions |
CV system periodicity Gas emission / absorption |
GRB's x-ray afterglow optical afterglow radio afterglow |
Flares CME's Coronal waves coronal loops network bright points active region evolution |
CME's, storms and sub-storms. Boundary crossings and particle acceleration, ionospheric outflow... | |
| Coordinates | ICRF J2000 Equatorial CMB: special tesselation, Galactic, equatorial, ecliptic |
J2000 Equatorial | WCS: Equatorial, Galactic, Ecliptic. Wavelength and time-ordered data. | RA, Dec | RA, Dec wavelength & energy scales flux |
RA, Dec | Heliographic lat/lon Arcseconds from sun center |
Mostly geocentric: GSE, GSM, GEI, MAG, SM, VDH. Geographic for groundbased instrumentation (Long, Lat). Also local time, l-shell etc. | |
| Time System | JD, UTC (NB leap seconds) PSR: LST, UT1 (Earth rotation corrected UTC), often transferred to TBD (Time at the solar system barycentre) |
UTC, LST | UTC (NB leap seconds). High-resolution time keys in instrumental data. Calendar time |
TDB | Heliocentric Julian Date Universal Time CV system orbital phase Julian Date |
UTC | UTC, Julian Modified Julian |
UTC, JD, MJD | |
| Accuracy Flags | Systematic: precision of reference object
properties (updatable) & references. Relative or random: distortion & noise-based error-finding routines. Instrument/observation properties. Calibration history. CMB:good/bad flags, statistical errors, instrument/observations properties, calibration history PSR: as rest of radio; time-stamp from GPS, Observatory Maser. NB accuracy: positions sub-mas; proper motions sub-mas/yr; time microsec; flux 10% |
Quality flags and errors (need selective application). Origin of photometric standard (usually planet). |
'Good/Bad' flags. Statistical errors. Scientific validation report. Absolute errors eg photometric reference. Procedures for error estimation. Often in different files, updatable. |
- | Detector factors photon statistics |
- | Missing data flag cosmic ray flag |
Quality, missing data (fill values), status (instrument mode etc.) | |
| Observational Systems | MERLIN (UK); VLA, VLBA (US); ATCA (Aus); GMRT (Ind); WSRT (NL); EVN & Global VLBI; VLBI with HALCA sattelite. Associated correlators CMB: Arrays: VSA (Tenerife), CBI. single-dish: Lovell and other JBO, Parkes, Bonn, Torun 32m independent halpha surveys, Manchester Wide-Field Camera, Satellites: MAP, Planck PSR: Arecibo, Parkes, Jodrell, Green Bank, Ooty, GMRT |
Arrays: MERLIN, NRAO VLA, OVRO, BIMA, Nobeyama millimetre array Single dish: Nancay, NRAO GBT (hopefully soon), IRAM 30m, MOPRA, SEST, Parkes, JCMT, CSO, NRAO 12m (rip), Nobeyama 45m, UKIRT, NOAO Kitt Peak 1.8m, UKIRT, NASA IRTF Satellites: ISO, IRAS, MSX |
IRAS; ISO; HERSCHEL | S-2 Cam William Herschel 4.2m | HST XMM-Newton EPIC, RGS, OM UK Infrared Telescope Isaac Newton Telescope |
BATSE Beppo Sax XMM-Newton Swift (future) |
Yokhoh, Soho RHESSI Noeyama Telescope Kitt Peak Trace Meudon Sacremento Peak Big Bear Solar Obs BATSE, GOES Secis |
ACE, Cluster, Cutlass, DMSP, EISCAT, Geotail, GOES, HEO, IMAGE, LANL, Polar, SOHO, SuperDARN?, Wind. Ground based magnetometer chains... | |
| Software | Correlator specific; AIPS(++); Difmap; IDL; local (perl, Fortran, C(++), VMS) CMB: AIPS, IDL, STARLINK, Gaia, specific VSA software PSR: TEMPO, local HI; AIPS(++), Miriad, Karma/td> | AIPS, GAG package incl. Class, Greg, Graphic, Specx, IRAF, Gaia, perldl and perl | Sattelite specific (incl. IDL- and JAVA -based); Starlink | FTOOLS, SAS | IDL, Molly, Figaro Gaia, convert XMM SAS, XSPEC SPEX 2.00, Mathcad |
IDL XMM SAS Fortran |
IDL SolarSoft DIPSO |
IDL, Matlab, IDFS, ISDAT, QSAS, CDAWlib, Satellite specific processing pipelines, anlysis and visualisation. |
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