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INFRARED: Help

INFRARED - Catalog of Infrared Observations (CIO), Edition 5


Overview

The Fifth Edition of the Catalog of Infrared Observations (CIO) comprises a summary of infrared astronomical observations published in the scientific literature from 1965 through 1997 in the wavelength range 1 micrometer (= 1 micron = 1 um) to 1 millimeter (= 1 mm). This catalog contains infrared observational data for sources outside the Solar System, constructed through a search of the most active scientific journals, IR surveys and catalogs. To date, about 6200 journal articles and 10 major survey catalogs have been included in the database from which this catalog was constructed. The catalog in its original form contains 374,653 individual observations of about 62,000 different infrared sources. More than 8000 of these sources are identifiable with visible objects. For sources with no published IR source position, a nominal position may have been given based on other sources. Nominal positions are usually the best available, but not necessarily the true IR positions. The HEASARC has removed 1136 of the 374,653 entries in the catalog in its original form for which there was no positional information, leaving 373,517 remaining entries in this HEASARC-realized version. The 1136 entries that were removed are listed in the file: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/deleted_entries.txt

In addition to the main catalog, the creators of CIO also generated other files, e.g., bibliographical files, an index file, etc., which are available via the Web or anonymous ftp (in the form of gzipped ASCII files) in the directory: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared in the HEASARC's anonymous ftp area. The bibliographical files (refauth.data.gz refchron.dat.gz, and refs.dat.gz) link observations in the catalog with references to the the original articles published in the literature (these references give the standard information plus the full titles). The Index of Infrared Source Positions is contained in the file names.dat.gz and is ordered alphabetically by source name: for sources with no published IR source position, a nominal position (usually the best available, but not necessarily the true IR position) may have been given based on other sources. Nominal position references are indicated in the index.


Catalog Bibcode

<II/225/catalog.dat>

References

Catalog of Infrared Observations, Edition 5
     Gezari D.Y., Pitts P.S., Schmitz M.
     <Unpublished (1999)>
Catalog of Infrared Observations, Edition 4
     Gezari D.Y., Pitts P.S., Schmitz M.
     <Unpublished (1997)>
Catalog of Infrared Observations, Edition 3.5
     Gezari D.Y., Pitts P.S., Schmitz M., Mead J.M.
     <Unpublished (1996)>
Catalog of Infrared Observations, 3rd Edition
     Gezari D.Y., Schmitz M., Pitts P.S., Mead J.M.
     <NASA Reference Publ. 1294 (1993)>
     =1993cio..book.....G

Provenance

This version of the 5th Edition of the Catalog of Infrared Observations was created by the HEASARC in April 2001 based on ADC/CDS catalog <II/225>.

HEASARC Changes

The HEASARC has removed 1136 of the 374,653 entries in the original version of the CIO Version 5 which lacked positional information, leaving 373,517 remaining entries in this HEASARC-realized version.

The parameter 'edition' contains a code indicating the edition number to which the data and/or position of the entry correspond. This code can have possible non-alphanumeric values such as "%" and "*" in the original catalog which the heasarc has changed to alphanumeric values as follows:

         " " has been converted to "0 "
         "*" has been converted to "0N"
         "%" has been converted to "1N"
         "$" has been converted to "2N"
         "#" has been converted to "3N"
         "@" has been converted to "4N"

Parameters

Edition
The edition of the catalog in which the IR data or the position of the object first appeared:

        0  = First edition data
        0N = First edition nominal position
        1  = Second edition data
        1N = Second edition nominal position
        2  = Third edition data from 1987 - 1990
        2N = Third edition nominal position from 1987 - 1990
        3  = 3.5th or Fourth edition data from 1991 - 1995
        3N = 3.5th or Fourth edition nominal position from 1991 - 1995
        4  = Fifth edition data from 1996 - 1997
        4N = Fifth edition nominal position for data from 1996 - 1997

        Nominal positions indicate a general area in the sky.
  

Name
The name of the object. It is common for an astronomical source to be listed by several different names in the catalog, since the observations are presented "as given" by the original authors. In general, source names should be given secondary importance when searching catalog listings, with positions given priority. Source names and positions are cross-referenced in the Index of Infrared Source Positions. Source names are sometimes abbreviated. In some cases the names were augmented by the editors (for example, when the original author assigns the source number but no identifying prefix).

RA
The Right Ascension of the object. The accuracy of the positional data in the catalog reflects that of the data published by the original author. This is true primarily for visible sources with well-documented positions. In such cases, the 'nominal' source position is entered in the position field by the editors. When authors omit specific source positions from their articles, they must presume that the position is common knowledge, to be found in the appropriate standard catalog. When no such position could be obtained by the editors, the RA and Dec were set to null in the CIO in its original form. All such (1136) entries have been removed from the HEASARC realization of the CIO and are instead listed in the file: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/deleted_entries.txt

Dec
The Declination of the object. The accuracy of the positional data in the catalog reflects that of the data published by the original author. This is true primarily for visible sources with well-documented positions. In such cases, the 'nominal' source position is entered in the position field by the editors. When authors omit specific source positions from their articles, they must presume that the position is common knowledge, to be found in the appropriate standard catalog. When no such position could be obtained by the editors, the RA and Dec were set to null in the CIO in its original form. All such (1136) entries have been removed from the HEASARC realization of the CIO and are instead listed in the file: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/deleted_entries.txt

LII
The galactic longitude of the object.

BII
The galactic latitude of the object.

Beam_Size
The aperture beam angular size. The angular beam size of the observation is presented in degrees (D), arcminutes (M), or arcseconds (S), according to the value of the beam_size_unit parameter. If no beam size information was given in the original reference, this parameter is left blank, and a dash (-) is entered as the value of the beam_size_unit parameter. If several aperture values were given in the original reference, this parameter is left blank, and "V" is entered as the value of the beam_size_unit parameter. In addition to being a factor in source brightness calculation, 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.

Beam_Size_Unit
This is a code indicating either the units for the aperture beam size, or the reason no value is given here:

     S = arcseconds
     M = arcminutes
     D = degrees
     V = several aperture values were given in the original reference
     - = no original beam size given in the original reference
  

Lambda
The wavelength at which the infrared flux value was measured, in micrometers (microns). For spectra, the starting wavelength of the spectrum is given. Note that some entries have a wavelength range outside the nominal 1 micron - 1 mm rangeof the catalog. Wavelengths shorter than 1 micron would indicate that a spectrum exists in the article starting at this wavelength and extending into the infrared. A few observations made at wavelengths greater than 1 mm have been included when the observation was basically done with far-infrared techniques (some broad-band submillimeter observations). The ending wavelengths can be found in the file: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/spectra.dat.gz available via the Web or anonymous ftp.

Flux_IR
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 help entry for the Flux_IR_Unit parameter). Upper limits are flagged in the Flux_IR_Flag parameter field. To protect the integrity of the data base, no attempt was made to convert these different units of infrared flux into a more homogeneous system. Fortunately, about 95 percent of the flux observations in the catalog have units of "magnitudes" or "Janskys," or have comments such as "polarization data," "spectrum," etc. An additional 3 percent of the entries are in five other commonly used units (B,E,F,I,X). The remaining 2 percent of the entries are in less common units, but which 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 (10,000K BB), which has been defined as 0 magnitude at all infrared wavelengths (see Gillett et al., 1971, Ap.J., 164, 83; Gertz and Woolf, 1971, Ap.J., 165, 185). The following symbols sometimes occur in the comments to the IR flux field (Flux_IR_Flag):

    V=variable or mean of several values,
    L=lower limit (detector saturated),
    U=upper limit
    E=editors determined flux from maps, spectra, or other
      material in the article presented in non-tabular form.
  
When spectral data (S) are listed (see Flux_IR_Unit), only the starting wavelength of the spectrum is given in the "lambda" column. Starting and ending wavelength of published spectra are given in the Atlas of Infrared Spectral Ranges (available as the file: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/spectra.dat.gz )

Flux_IR_Unit
This is the infrared flux unit code, as follows:

       A = normalized magnitude
       B = 10-19W/m2/Hz/sr
       C = magnitude derived from color
       D = diameter measurement
       E = erg/s/cm2/sr
       F = 10-16W/cm2/um
       G = 10-14erg/s/cm2
       H = log(ergs/s/cm2/Hz)
       I = 10-9W/cm2/um/sr
       J = Jy
       JA= Jy/arcsec2
       K = log(Jy)
       L = log(W/m2/Hz)
       M = magnitude
       MA= magnitude/arcsec2
       N = log(erg/s/cm2/um)
       P = polarization data
       Q = log(10-3Jy)
       R = log(W/cm2/um)
       S = spectral data
       T = -2.5log(erg/s/cm2/Hz)-48.60
       U = upper limit
       V = variable
       W = 10-14W/m2
       X = 10-18W/cm2
       Y = relative line intensity
       Z = 10-21W/cm2/um/arcsec
  

Flux_IR_Flag
This is a code for comments about the infrared flux, Flux_IR:

      E = Flux obtained by the editors
      L = Flux value is a lower limit
      U = Flux value is an upper limit
      V = Flux value is an average value
      ? = Flux value as published is inconsistent
      Blank = no comment
  

Ref_Flux_IR
The bibliographic reference number identifies the original Journal article for each observation in the catalog, keyed to the entry in the bibliographic reference file. The bibliographic reference number is made up of the year and month of publication, and a randomly assigned sequential number. In case the publication did not contain infrared observations an "89" or "99" was assigned as the month of publication. A "89" means that the reference was published in the nineteenth century. References that do not indicate the month of publication have 00 in the month field. The cross-identification of these reference codes with the actual references can be found in the gzipped files: ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/refauth.dat.gz (in alphabetical order by author) and ftp://legacy.gsfc.nasa.gov/heasarc/dbase/misc_files/infrared/refchron.dat.gz (in chronological order).

IRAS_Name
The IRAS cross identification. These are based on the IRAS Point Source Catalog V2.0 identifications. Only object ID was checked - not position. Cross- references are up-to-date through 1997.

Flux_12_Micron
The IRAS flux strength code at 12 micron (um). The strength code is logarithmic as follows: 0 = 0.5-5 Jy; 1= 5-50 Jy; 2=50-500 Jy; 3 = 500-5000 Jy; 4 = 5000-50000 Jy; and 5 = 50000-500000 Jy. For each CIO source detected by IRAS, the corresponding order-of-magnitude IRAS PSC version 1.0 flux is given using four digits, one each for the four IRAS bands. The values represent the approximate logarithm of the flux density. This allows the user to get an immediate estimate of the IRAS PSC fluxes in a compact format.

Flux_25_Micron
The IRAS flux strength code for 25 micron (um). The strength code is logarithmic as follows: 0 = 0.5-5 Jy; 1= 5-50 Jy; 2=50-500 Jy; 3 = 500-5000 Jy; 4 = 5000-50000 Jy; and 5 = 50000-500000 Jy. For each CIO source detected by IRAS, the corresponding order-of-magnitude IRAS PSC version 1.0 flux is given using four digits, one each for the four IRAS bands. The values represent the approximate logarithm of the flux density. This allows the user to get an immediate estimate of the IRAS PSC fluxes in a compact format.

Flux_60_Micron
The IRAS flux strength code for 60 micron (um). The strength code is logarithmic as follows: 0 = 0.5-5 Jy; 1= 5-50 Jy; 2=50-500 Jy; 3 = 500-5000 Jy; 4 = 5000-50000 Jy; and 5 = 50000-500000 Jy. For each CIO source detected by IRAS, the corresponding order-of-magnitude IRAS PSC version 1.0 flux is given using four digits, one each for the four IRAS bands. The values represent the approximate logarithm of the flux density. This allows the user to get an immediate estimate of the IRAS PSC fluxes in a compact format.

Flux_100_Micron
The IRAS flux strength code for 100 micron (um). The strength code is logarithmic as follows: 0 = 0.5-5 Jy; 1= 5-50 Jy; 2=50-500 Jy; 3 = 500-5000 Jy; 4 = 5000-50000 Jy; and 5 = 50000-500000 Jy. For each CIO source detected by IRAS, the corresponding order-of-magnitude IRAS PSC version 1.0 flux is given using four digits, one each for the four IRAS bands. The values represent the approximate logarithm of the flux density. This allows the user to get an immediate estimate of the IRAS PSC fluxes in a compact format.

Quality_12_Micron
The IRAS flux quality code at 12 um:

     IRAS Flux Quality Codes:
     -------------------------
     Blank =  good quality
     :     =  moderate quality
     S     =  Saturated
     U     =  upper limit
  

Quality_25_Micron
The IRAS flux quality code at 25 um:

     IRAS Flux Quality Codes:
     -------------------------
     Blank =  good quality
     :     =  moderate quality
     S     =  Saturated
     U     =  upper limit
  

Quality_60_Micron
The IRAS flux quality code at 60 um:

     IRAS Flux Quality Codes:
     -------------------------
     Blank =  good quality
     :     =  moderate quality
     S     =  Saturated
     U     =  upper limit
  

Quality_100_Micron
The IRAS flux quality code at 100 um:

     IRAS Flux Quality Codes:
     -------------------------
     Blank =  good quality
     :     =  moderate quality
     S     =  Saturated
     U     =  upper limit
  

Contact Person

Questions regarding the INFRARED database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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