J/ApJ/699/1153 Kinematic distances to GRS molecular clouds (Roman-Duval+, 2009)
Kinematic distances to molecular clouds identified in the Galactic Ring Survey. Roman-Duval J., Jackson J.M., Heyer M., Johnson A., Rathborne J., Shah R., Simon R. <Astrophys. J., 699, 1153-1170 (2009)> =2009ApJ...699.1153R
ADC_Keywords: Molecular clouds ; Interstellar medium ; Radio continuum Keywords: Galaxy: kinematics and dynamics - Galaxy: structure - H II regions - ISM: clouds - molecular data Abstract: Kinematic distances to 750 molecular clouds identified in the 13COJ=1-0 Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey (GRS) are derived assuming the Clemens rotation curve of the Galaxy. The kinematic distance ambiguity is resolved by examining the presence of HI self-absorption toward the 13CO emission peak of each cloud using the Very Large Array Galactic Plane Survey. We also identify 21cm continuum sources embedded in the GRS clouds in order to use absorption features in the HI 21cm continuum to distinguish between near and far kinematic distances. The Galactic distribution of GRS clouds is consistent with a four-arm model of the Milky Way. The locations of the Scutum-Crux and Perseus arms traced by GRS clouds match star-count data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire star-count data. We conclude that molecular clouds must form in spiral arms and be short-lived (lifetimes <107yr) in order to explain the absence of massive, 13CO bright molecular clouds in the interarm space. Description: Our sample contains molecular clouds that were identified by their 13CO(J=1-0) emission in the BU-FCRAO GRS (Jackson et al. 2006ApJS..163..145J). The GRS was conducted using the Five College Radio Astronomy Observatory (FCRAO) 14m telescope in Salem, MA, between 1998 and 2005. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 752 Kinematic distances to molecular clouds in the GRS using HI self-absorption and 21cm continuum absorption
See also: J/ApJS/182/131 : Molecular clouds and clumps in the GRS (Rathborne+, 2009) J/ApJ/699/1092 : Galactic molecular clouds (SRBY) (Heyer+, 2009) J/ApJ/626/887 : HI clouds in Southern Galactic Plane Survey (Kavars+, 2005) J/A+A/327/325 : Distances of molecular cloud (May+, 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [GRSMC] 7- 19 A13 --- GRSMC Galactic Ring Survey (GRS) Molecular Cloud identification (G0LL.ll+0B.bb) (1) 21- 25 F5.2 deg GLON Galactic longitude 27- 31 F5.2 deg GLAT Galactic latitude 33- 38 F6.2 km/s Vlsr Local Standard of Rest radial velocity 40- 43 F4.2 deg dLon Spatial FWHM of the cloud along Galactic longitude 45- 48 F4.2 deg dLat Spatial FWHM of the cloud along Galactic latitude 50- 53 F4.2 km/s DelV FWHM velocity dispersion 55- 59 F5.2 kpc Dist Kinematic distance to the cloud 61- 64 F4.2 10+4K.km/s/pc2 LCO The CO luminosity 66 A1 --- 21cm? [y ] A 21cm continuum source?
Note (1): From Rathborne et al. (2009, Cat. J/ApJS/182/131; <GRSMC LL.ll+B.bb> in Simbad).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Jul-2011
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