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J/A+A/284/233   Association of HII regions and IRAS PSC sources (Codella+ 1994)
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HII Regions and IRAS PSC sources: the reliability of the association
     Codella C., Felli M., Natale V.
    <Astron. Astrophys. 284, 233 (1994)>
    =1994A&A...284..233C
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ADC_Keywords: H II regions ; Infrared sources
Keywords: HII regions - radio   lines: interstellar - stars: formation
          infrared: continuum: ISM

Abstract:
    The IRAS Point Source Catalogue (PSC) has been compared with a catalog of 
    462 (diffuse) H II regions detected in hydrogen radio recombination lines. 
    To distinguish the true IRAS counterpart of the H II region from chance 
    coincidences the distribution of offset and the position in color-color 
    plots as a function of F(60 micrometers) are investigated. It is found that
    sources with F(60 micrometers) less than 100 Jy have a high probability of
    being chance coincidences. The far infrared properties of the H II regions
    are investigated for a subsample of 252 IRAS PSC sources which have a high 
    (greater than 80%) probability of being true coincidences. The majority 
    satisfy the Wood and Churchwell color criteria which identify ultracompact
    H II regions; therefore, these criteria select ultracompact as well as 
    more diffuse H II regions, or, alternatively, diffuse H II and 
    ultracompact H II regions may often be mixed, as predicted by the 
    sequential star formation theory. The luminosity of a single star required
    to produce the observed H II line emission correlates very well with the 
    far infrared luminosity and is, on the average, higher than the observed 
    value. Consequently, the stars ionizing the extended H II regions can 
    account for the bulk of the observed FIR emission and no contribution 
    from lower mass stars of the cluster is necessary. 

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table1.dat     156        252    IRAS properties of HII regions
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Byte-by-byte Description of file: table1.dat
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   Bytes Format  Units   Label    Explanations
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   1-  2  I2     h       RAh      Right Ascension (1950)
   4-  5  I2     min     RAm      Right Ascension (1950)
   7- 10  F4.1   s       RAs      Right Ascension (1950)
      13  A1     ---     DE-      Declination sign
  14- 15  I2     deg     DEd      Declination (1950)
  17- 18  I2     arcmin  DEm      Declination (1950)
  20- 21  I2     arcsec  DEs      Declination (1950)
  26- 32  F7.3   deg     GLON     Galactic longitude
  35- 41  F7.3   deg     GLAT     Galactic latitude
  49- 53  F5.2   kpc     d        []? Distance
  55- 58  I4     pc      z        []? Height from the galactic plane
  65- 75  A11    ---     IRAS     IRAS name
      81  A1     ---   l_F12      limit flag on F12 (upper limit)
  83- 90  E8.2   Jy      F12      IRAS flux density at 12 micron
      92  A1     ---   l_F25      limit flag on F25 (upper limit)
  94-101  E8.2   Jy      F25      IRAS flux density at 25 micron
     103  A1     ---   l_F60      limit flag on F60 (upper limit)
 105-112  E8.2   Jy      F60      IRAS flux density at 60 micron
     114  A1     ---   l_F100     limit flag on F100 (upper limit)
 116-123  E8.2   Jy      F100     IRAS flux density at 100 micron
     125  A1     ---   l_FIR      limit flag on FIR (upper limit)
 127-134  E8.2   W/m2    FIR      Integrated infrared flux
     136  A1     ---   l_LFIR     limit flag on LFIR (upper limit)
 138-145  E8.2   solLum  LFIR     []? IRAS luminosity
 148-156  A9     ---     R        Remarks: D    : double position
                                           UCHII: IRAS sources inside the WC box
                                           O    : observed UCHII region
                                                   (see text)
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(End)                                           Patricia Bauer [CDS] 25-Nov-1993