J/ApJS/181/255 CO in Galactic HII regions (Anderson+, 2009)
The molecular properties of Galactic H II regions. Anderson L.D., Bania T.M., Jackson J.M., Clemens D.P., Heyer M., Simon R., Shah R.Y., Rathborne J.M. <Astrophys. J. Suppl. Ser., 181, 255-271 (2009)> =2009ApJS..181..255A
ADC_Keywords: H II regions ; Radio lines ; Interstellar medium Keywords: H II regions - ISM: clouds - ISM: evolution - ISM: lines and bands - ISM: structure - radio lines: ISM Abstract: We derive the molecular properties for a sample of 301 Galactic HII regions including 123 ultra compact (UC), 105 compact, and 73 diffuse nebulae. We analyze all sources within the BU-FCRAO Galactic Ring Survey (GRS) of 13CO emission known to be HII regions based upon the presence of radio continuum and cm-wavelength radio recombination line emission. Unlike all previous large area coverage 13CO surveys, the GRS is fully sampled in angle and yet covers ∼75deg2 of the Inner Galaxy. The angular resolution of the GRS (46") allows us to associate molecular gas with HII regions without ambiguity and to investigate the physical properties of this molecular gas. We find clear CO/HII morphological associations in position and velocity for ∼80% of the nebular sample. Compact HII region molecular gas clouds are on average larger than UC clouds: 2.2' compared to 1.7'. Description: We trace these molecular properties of Galactic HII regions using the 13COJ=1->0 emission mapped by the Boston University-Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ring Survey (GRS: Jackson et al. 2006ApJS..163..145J, available at http://www.bu.edu/galacticring). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 96 301 HII region source sample table3.dat 89 301 Properties of molecular cloud HII region sources
See also: VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989) VII/50 : CO Radial Velocities Toward Galactic H II Regions (Blitz+ 1982) J/A+A/417/107 : CO velocities in southern HII regions (Russeil+, 2004) J/ApJ/690/706 : Distances for HII regions (Anderson+, 2009) http://www.bu.edu/galacticring : BU-FCRAO GRS home page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Source name (ALL.ll+B.bba) 14- 18 F5.2 deg GLON Galactic longitude 20- 24 F5.2 deg GLAT Galactic latitude 26- 27 I2 h RAh Hour of Right Ascension (J2000) 29- 30 I2 min RAm Minute of Right Ascension (J2000) 32- 33 I2 s RAs Second of Right Ascension (J2000) 35 A1 --- DE- Sign of the Declination (J2000) 36- 37 I2 deg DEd Degree of Declination (J2000) 39- 40 I2 arcmin DEm Arcminute of Declination (J2000) 42- 43 I2 arcsec DEs Arcsecond of Declination (J2000) 45- 49 F5.1 km/s VLSR Local Standard of Rest velocity 51- 54 F4.1 km/s e_VLSR Uncertainty in VLSR 56- 71 A16 --- Aut Author's name of the reference 73- 91 A19 --- BibCode Bibcode of the reference 93- 96 A4 --- n_Name Additional comments (1)
Note (1): Comments as follows: a = Changed nebular classification from compact; b = Changed from 19.67-0.14; c = Changed from 21.44-0.56; d = Changed from 23.25-0.27; e = Changed nebular classification from diffuse; f = Changed from 24.50-0.06; g = Changed from 25.80-0.14; h = Changed from 25.95+0.13; i = Changed from 30.06-0.32; j = Changed from 30.23-0.15; k = Changed from 30.51-0.45; l = Changed from 52.24-0.54.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Source name (ALL.ll+B.bba) 14- 18 F5.2 deg GLONf ? Fitted ellipse Galactic longitude 20- 24 F5.2 deg GLATf ? Fitted ellipse Galactic latitude 26- 29 F4.1 arcmin Size ? Fitted ellipse size 31- 34 F4.1 arcmin MajAxis ? Fitted ellipse semi-major axis 36- 38 F3.1 arcmin MinAxis ? Fitted ellipse semi-minor axis 40- 44 F5.1 deg PA [-90/+90]? Fitted ellipse position angle 46- 51 F6.2 km/s Vel ? Fitted gaussian velocity 53- 56 F4.2 km/s e_Vel ? The 1σ uncertainty in Vel 58- 62 F5.2 K TMB ? Fitted gaussian brightness temperature 64- 67 F4.2 K e_TMB ? The 1σ uncertainty in TMB 69- 72 F4.2 km/s DelV ? Fitted gaussian FWHM line width 74- 77 F4.2 km/s e_DelV ? The 1σ uncertainty in DelV 79- 82 F4.1 K Tex ? CO excitation temperature 84- 87 F4.1 10+16/cm2 N13CO ? The 13CO column density 89 A1 --- CP [A-E] Nebular confidence parameter (1)
Note (1): To distinguish sources with an unambiguous molecular gas component at the HII region position and velocity from those with less robust molecular gas associations, we assign a confidence parameter (CP). Qualitative criteria for the confidence parameter are as follows: A = no ambiguity in position or velocity, the molecular gas coincident with radio continuum or shows clear signs of interaction; B = either offset somewhat in position or velocity, or in a complex region of molecular gas; C = either offset in position or velocity or in a complex region, but fainter than a B source and offset further; D = diffuse emission near the correct position and velocity, but uncharacterizable due to low intensity or ambiguous morphology; E = nothing at all apparent in position and velocity.
History: From electronic version of the journal References: Anderson & Bania. Paper II. 2009ApJ...690..706A Cat. J/ApJ/690/706
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Feb-2011
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