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J/ApJ/699/1092         Giant molecular clouds (SRBY)           (Heyer+, 2009)
Re-examining Larson's scaling relationships in Galactic molecular clouds.
    Heyer M., Krawczyk C., Duval J., Jackson J.M.
   <Astrophys. J., 699, 1092-1103 (2009)>
   =2009ApJ...699.1092H
ADC_Keywords: Molecular clouds ; Velocity dispersion ; Interstellar medium

Keywords: ISM: clouds - ISM: kinematics and dynamics


Abstract:
    The properties of Galactic molecular clouds tabulated by Solomon et
    al. (SRBY; 1987ApJ...319..730S) are re-examined using the Boston
    University-FCRAO Galactic Ring Survey of 13COJ=1-0 emission. These
    new data provide a lower opacity tracer of molecular clouds and
    improved angular and spectral resolution compared with previous
    surveys of molecular line emission along the Galactic Plane. We
    calculate giant molecular cloud (GMC) masses within the SRBY cloud
    boundaries assuming local thermodynamic equilibrium (LTE) conditions
    throughout the cloud and a constant H2 to 13CO abundance, while
    accounting for the variation of the 12C/13C with galactocentric
    radius.

Description:
    The Boston University-FCRAO Galactic Ring Survey (GRS) imaged the
    13COJ=1-0 emission between Galactic longitudes 18° and 56°
    and latitudes, |b|≤1° with the FCRAO 14m telescope between
    1998-2005 (Jackson et al. 2006ApJS..163..145J).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        84      158   Rederived Giant Molecular Cloud (GMC) properties


See also:
 J/PASJ/62/557  : CO clouds in the Galactic Center from NANTEN (Takeuchi+, 2010)
 J/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009)
 J/ApJ/699/1153 : Distances to GRS molecular clouds (Roman-Duval+, 2009)
 J/ApJ/672/930  : Distant CO clouds in third galactic quadrant (Vazquez+, 2008)
 J/AJ/131/1501  : Intermediate-velocity clouds in the CGPS (Kerton+, 2006)
 J/ApJ/626/887  : HI clouds in Southern Galactic Plane Survey (Kavars+, 2005)
 J/PASJ/57/917  : CO molecular clouds in southern Galactic Warp (Nakagawa+,
                  2005)


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

   Bytes Format Units     Label     Explanations

   1-  3  I3    ---       SRBY      Solomon et al. 1987ApJ...319..730S
                                    identification number
   5-  9  F5.2  deg       GLON      Galactic longitude (1)
  11- 15  F5.2  deg       GLAT      Galactic latitude (1)
  17- 21  F5.1  km/s      Vel       LSR velocity (1)
  23- 25  F3.1  kpc       Rg        Galactocentric radius (1)
  27- 30  F4.1  kpc       Dist      Heliocentric distance (1)
  32- 34  F3.1  km/s      sigA1     Velocity dispersion within A_1_ area (1)
  36- 39  F4.1  pc        rA1       Radius with A_1_ area (1)
  41- 48  E8.2 K.km/s.pc2 LCOA1     CO luminosity (1)
  50- 57  E8.2  Msun      M-A1      Mass assuming LTE (1)
  59- 61  F3.1  km/s      sigA2     Velocity dispersion within A_2_ area (2)
  63- 66  F4.1  pc        rA2       Radius with A_2_ area (2)
  68- 75  E8.2 K.km/s.pc2 LCOA2     CO luminosity within A_2_ area (2)
  77- 84  E8.2  Msun      M-A2      Mass assuming LTE within A_2_ area (2)

Note (1): Within SRBY Defined Area, A1. See section 2 for further details.

Note (2): Within Half Max Isophote of N(H2), A2.



History:
    From electronic version of the journal
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    06-Jul-2011