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J/A+A/308/573       Ammonia on YSOs IRAS sources (Molinari+ 1996)
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A search for precursors of ultracompact HII regions in a sample of luminous 
IRAS sources. I. Association with ammonia cores.
      Molinari S., Brand J., Cesaroni R., Palla F.
     <Astron. Astrophys. 308, 573 (1996)>
     =1996A&A...308..573M      (SIMBAD/NED BibCode)
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ADC_Keywords: YSOs ; Radio lines
Keywords: stars: formation - stars: pre-main sequence -
          stars: circumstellar matter - radio lines: ISM -
          ISM: HII regions; molecules

Description:
    We present observations of NH_3_ (1,1) and (2,2) lines in two
    flux-limited samples of IRAS sources selected according to colour
    criteria which should result in a high fraction of Young Stellar
    Objects. The first sample contains sources (named 'LOW') whose
    evolutionary status is essentially unknown, while the second sample
    contains sources (named 'HIGH') possibly associated with ultracompact
    HII regions, the distinction being based on the IRAS [25-12] colour.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table1.dat     124        163    General informations about observed sources.
table2.dat      95        102    Ammonia line parameters and deduced physical
                                  quantities
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See also:
  J/A+A/336/339 : VLA observations. Paper II. (Molinari+ 1998)

Byte-by-byte description of file: table1.dat
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  Bytes Format  Units   Label   Explanations
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   1-  3  I3    ---     Mol     Running number
   6- 16  A11   ---     IRAS    IRAS name
      18  A1    ---     Type    [HL] Source type (H --> HIGH; L --> LOW)
      19  A1    ---   n_Type    [^] A '^' means a 12um flux upper limit for
                                     that source
  22- 23  I2    h       RAh     1950 hours of Right Ascension
  25- 26  I2    min     RAm     1950 minutes of Right Ascension
  28- 31  F4.1  s       RAs     1950 seconds of Right Ascension
      34  A1    ---     DE-     sign for declination
  35- 36  I2    deg     DEd     1950 degrees of Declination
  38- 39  I2    arcmin  DEm     1950 arcmin of Declination
  41- 44  F4.1  arcsec  DEs     1950 arcsec of Declination
  47- 53  F7.3  deg     GLON    Galactic longitude
  56- 61  F6.3  deg     GLAT    Galactic latitude
  65- 69  F5.2  kpc     Dist    ? Distance from observer
      70  A1    ---   n_Dist    [ab] Note on distance (1)
  72- 79  E8.2  solLum  Lum     ? Bolometric luminosity
      82  A1    ---     NH3det  Y/N flag indicating detection in ammonia
      85  A1    ---     H2Odet  Y/N flag indicating detection in water maser
  88-123  A36   ---     IDent   Other identification from the literature
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Note (1): 'a' means that the distance ambiguity has been resolved
          'b' means the the distance of the tangent point has been assumed
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Byte-by-byte description of file: table2.dat
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  Bytes Format  Units   Label   Explanations
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   1- 3 I3      ---     Mol     Running number (as in Table1.dat)
   5- 9 F5.2    K       T11     Antenna temperature for line (J,K)=(1,1)
  11-12 I2      %     e_T11     Percentage uncertainty on T11
  14-19 F6.1    km/s    V11     (1,1) center line velocity
  21-22 I2      %     e_V11     Percentage uncertainty on V11
  25-28 F4.2    km/s    W11     (1,1) FWHM
  30-31 I2      %     e_W11     Percentage uncertainty on W11
  34-38 F5.2    K       T22     ? Antenna temperature for line (J,K)=(2,2)
  40-41 I2      %     e_T22     ? Percentage uncertainty on T22
  43-48 F6.1    km/s    V22     ? (2,2) center line velocity
  50-51 I2      %     e_V22     ? Percentage uncertainty on V22
  54-57 F4.2    km/s    W22     ? (2,2) FWHM
  59-60 I2      %     e_W22     ? Percentage uncertainty on W22
  63-67 F5.2    K       Tkin    ? Ammonia kinetic temperature
     68 A1      ---   l_Tkin    [ :] flag indicating that Tkin is a limit
  69-70 I2      %     e_Tkin    ? Percentage uncertainty on Tkin
  72-80 E9.2    cm-2    Ncol    ? Ammonia column density
     81 A1      ---   l_Ncol    [ :] flag indicating that Ncol is a limit
  82-83 I2      %     e_Ncol    ? Percentage uncertainty on Ncol
     86 A1      ---   l_Tau     [ <] indicates if the Tau value is upper limit
  87-90 F4.2    ---     Tau     ? Optical depth of (1,1) line
  92-93 I2      %     e_Tau     ? Percentage uncertainty on Tau
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Courtesy: Sergio Molinari, <smolinar@isows4.vilspa.esa.es>

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(End)                                         Patricia Bauer [CDS]   16-Apr-1996