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J/ApJ/653/383    SCUBA observations in Orion A South region   (Johnstone+, 2006)
Large-area mapping at 850µm.
V. Analysis of the clump distribution in the Orion A South molecular cloud.
    Johnstone D., Bally J.
   <Astrophys. J., 653, 383-397 (2006)>
   =2006ApJ...653..383J
ADC_Keywords: Molecular clouds ; Millimetric/submm sources

Keywords: infrared: ISM: continuum -
          ISM: individual (HH 1/2, HH 34, L1641N, OMC 4, OMC 5, Orion A South) -
          ISM: structure - stars: formation

Abstract:
    We present results from a 2300arcmin2 survey of the Orion A molecular
    cloud at 450 and 850um using the Submillimeter Common-User Bolometer
    Array (SCUBA) on the James Clerk Maxwell Telescope. The region mapped
    lies directly south of the OMC 1 cloud core and includes OMC 4, OMC 5,
    HH 1/2, HH 34, and L1641N. We identify 71 independent clumps in the
    850um map and compute size, flux, and degree of central concentration
    in each.

Description:
    The data covering the Orion A South region were obtained between 1997
    and 2002 using SCUBA at the James Clerk Maxwell Telescope (JCMT).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        74       71   Clump properties in Orion A south derived
                              from 850um data


See also:
 J/ApJ/559/307 : Sub-mm mapping in Ori B molecular cloud (Johnstone+, 2001)
 J/ApJ/639/259 : Sub-mm clumps in Ori B South molecular cloud (Johnstone+, 2006)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 12  A12   --      SMMJ      Name formed with J2000.0 positions
                                   (HHMMmm+DDMMm),
                                   [JB2006] SMM JHHMMmm+DDMMm in Simbad
  14- 15  I2    ---     [JB2006]  Sequential number
  17- 18  I2    h       RAh       Right ascension (J2000.0) (1)
  20- 21  I2    min     RAm       Right ascension (J2000.0) (1)
  23- 26  F4.1  s       RAs       Right ascension (J2000.0) (1)
      28  A1    ---     DE-       Declination sign (J2000.0) (1)
  29- 30  I2    deg     DEd       Declination (J2000.0) (1)
  32- 33  I2    arcmin  DEm       Declination (J2000.0) (1)
  35- 36  I2    arcsec  DEs       Declination (J2000.0) (1)
  38- 42  F5.2  Jy      S850      Total flux at 850um (2)
  44- 47  F4.2  Jy      Sp850     Peak flux at 850um (Jy/beam) (2)
  49- 50  I2    10+3AU  Reff      Effective radius (2)
  52- 55  F4.2  ---     C         Concentration parameter (3)
  57- 58  I2    K       Td        Dust temperature (3)
  60- 62  F3.1  [K/cm3] log(P/k)  External pressure (3)
  64- 68  F5.2  solMass M         Mass at dust temperature (3)
  70- 74  F5.2  solMass M20K      Mass at dust temperature Td=20K (4)

Note (1): Position of peak surface brightness within clump (accurate to 3").

Note (2): Radius, peak flux, and total flux are derived from CLFIND
     (Williams et al., 1994, Cat. J/ApJ/428/693). The peak flux and total
     flux have uncertainties of about 20%, mostly due to absolute flux
     calibration. The radius has not been deconvolved from the telescope beam.
Note (3): Quantities derived from Bonnor-Ebert analysis (see text).

Note (4): Mass derived from the total flux assuming Td=20K and
          k850=0.02cm2/g.


History:
    From electronic version of the journal

References:
   Johnstone et al., Paper I       2000ApJS..131..505J
   Johnstone et al., Paper II      2000ApJ...545..327J
   Johnstone et al., Paper III     2001ApJ...559..307J, Cat. J/ApJ/559/307
   Johnstone et al., Paper IV      2006ApJ...639..259J, Cat. J/ApJ/639/259
(End)                                      Patricia Vannier [CDS]    31-Jul-2008