DOWNLOADABLE FILE FORMATS CIO - EDITION 5.1 (REVISED NOVEMBER 29, 2000) I. MAIN CATALOG 00.dat, 01.dat, etc. Column Contents Description 1 COMMENT Editor's comment (See COMMENT below) 2-14 NAME Source name as given in article 15-24 RA Right Ascension (1950) (See COMMENT below) 25-33 DEC Declination (1950) (See COMMENT below) 34-37 BEAM Aperture size (see BEAM below) 38-44 LAMBDA(microns) Wavelength in microns 45-49 FLUX Source flux 50-51 UNIT Flux unit and optional comment (See FLUX below) 52-57 BIBLIO Bibliographic reference code (See BIBLIO below) 58-68 PSC NAME Source name in the IRAS Point Source Catalog 69-72 IRAS FLUX Order-of-magnitude IRAS flux at 12, 25, 60, and 100 microns (See IRAS below) 73-76 PSC CODE PSC quality codes for each wavelength (See IRAS below) COMMENT (Col. 1)-- The accuracy of the positional data in the CIO reflects that of the data published by the original author. In addition, an alarming number of infrared observations were published without specifying the source position. This is true primarily for visible sources with well documented positions in commonly-used catalogs. In such cases, a catalog position is entered in the Right Ascension and Declination fields by the editors. When no position is available to the editors, all such entries are sorted alphabetically by source name and included in the file 99.dat. Objects which can be located in a general area of the sky (e.g., individual stars around a globular cluster) are supplied with a "nominal" source position and a code is entered in byte 1 of the record for that source. Specifically, "*" was used in version 1 of the CIO, "%" in version 2, "$" in version 3, "#" in version 4, "@" in version 5, and "!" in version 5.1 to indicate nominal positions. BEAM (Cols. 34-37)-- The angular beam size of the observation is presented in degrees (D), arcminutes (M), or arcseconds (S). If no beam size information was given in the original reference, a dash (-) is entered. In addition to being a factor in source brightness calculation, the beam size can be used as an aid in determining positional coincidences and identifications with other sources, and as a first-order indication of positional accuracy. FLUX (Cols. 45-49)-- The infrared flux is listed in the same units as published by the original observers. The units have been given one- or two-letter abbreviations (see UNITS file). To protect the integrity of the database, no attempt has been made to convert these different units of infrared flux into a more homogeneous system. Fortunately, about 95% of the flux observations in the catalog have units of "magnitudes" or "Janskys," or have commonly used units (B, E, F, I, X). The remaining 2% of the entries are in less common units, but these are dimensionally equivalent to one of the more commonly used units. In general, infrared magnitudes are calibrated with respect to the flux density of Alpha Lyr (10^4 K blackbody), which is defined as being 0 magnitude at all infrared wavelengths (see Gillett et al., 1971, Ap.J., 164, 83; Gehrz and Woolf, 1971, Ap.J., 165, 185). The following symbols sometimes occur next to values in the FLUX column: V = variable or mean of several values; L = lower limit (detector saturated); U = upper limit; E = editor determined flux from maps, spectra, or other material in the article not in tabulated form. BIBLIO (Cols. 52-57)-- The bibliographic reference code identifies the original journal article for each observation in the catalog, keyed to the chronological refchron.dat file. The bibliographic reference number is made up of the year and month of publication, and a sequential number is assigned to the article (for example, "790104" breaks down into 79-01-04, where 79 = 1979, 01 = January, and 04 = article randomly assigned as #4 in that month). References that do not indicate the month of publication have "00" in the month field. IRAS (Cols. 58-68)-- The large number of sources (245,000) in the IRAS Point Source Catalog (PSC) would clearly overwhelm the CIO. Criteria had to be established to include IRAS data without changing the basic nature of the catalog. Order-of-magnitude IRAS PSC fluxes have been included in the main catalog files for all CIO sources which were also detected in the IRAS PSC Version 2.0 (about 27,200 of the individual sources listed in this edition of the CIO). The four digits used represent the approximate logarithm of the flux density in each of the four IRAS bands. For example, "0012" means that the source listed has fluxes of roughly 1, 1, 10, and 100 Janskys in IRAS bands 1, 2, 3, and 4 (12, 25, 60, and 100 microns), respectively. The numbers used in this notation are specifically 0 = < 5 Jy, 1 = 5-50 Jy, 2 = 50-500 Jy, 3 = 500-5000 Jy, etc. Exact values for the PSC fluxes of CIO sources can be obtained from the PSC files, which list positions and fluxes from version 2.0 of the Point Source Catalog (see below). The PSC quality codes are: blank = high; : = moderate; U = upper limit; S = saturated.

II. NAME APPENDIX names.dat Column Contents Description 8-20 NAME Source name 23-32 RA Right Ascension (1950) (See COMMENT above) 34-42 DEC Declination (1950) (See COMMENT above) III. SPECTRAL APPENDIX spectra.dat Column Contents Description 1-13 NAME Source name 15-22 LAMBDA START Beginning wavelength in microns 26-33 LAMBDA END Ending wavelength in microns 40-45 BIBLIO Bibliographic reference code IV. PSC APPENDIX psc.dat Column Contents Description 2-12 PSC NAME IRAS Point Source Catalog name 15-24 RA Right Ascension from Point Source Catalog, version 2 26-34 DEC Declination " 36-47 FLUX12 12-micron flux " 48 CODE12 12-micron quality code " 50-61 FLUX25 25-micron flux " 62 CODE25 25-micron quality code " 64-75 FLUX60 60-micron flux " 76 CODE60 60-micron quality code " 78-89 FLUX100 100-micron flux " 90 CODE100 100-micron quality code " PSC quality codes -- blank = high quality : = moderate quality U = upper limit S = detector saturated V. REFERENCES refauth.dat and refchron.dat References are listed alphabetically by author in refauth.dat and chronologically by reference number (BIBLIO) in refchron.dat.