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J/A+A/489/533     M83 volume densities of giant molecular clouds (Heiner+, 2008)

The volume densities of giant molecular clouds in M83. Heiner J.S., Allen R.J., Ivy Wong O., van der Kruit P.C. <Astron. Astrophys. 489, 533 (2008)> =2008A&A...489..533H
ADC_Keywords: Galaxies, nearby ; Molecular clouds ; Ultraviolet ; Radio lines Keywords: galaxies: individual: M83 - galaxies: ISM - ISM: clouds - ISM: molecules - Ultraviolet: galaxies - Radio lines: galaxies Abstract: Using observed GALEX far-ultraviolet (FUV) fluxes and VLA images of the 21-cm HIcolumn densities, along with estimates of the local dust abundances, we measure the volume densities of a sample of actively star-forming giant molecular clouds (GMCs) in the nearby spiral galaxy M83 on a typical resolution scale of 170 pc. Our approach is based on an equilibrium model for the cycle of molecular hydrogen formation on dust grains and photodissociation under the influence of the FUV radiation on the cloud surfaces of GMCs. We find a range of total volume densities on the surface of GMCs in M83, namely 0.1-400cm-3 inside R25, 0.5-50cm-3 outside R25. Our data include a number of GMCs in the HI-ring surrounding this galaxy. Finally, we discuss the effects of observational selection, which may bias our results. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 49 76 Locations and FUV fluxes of candidate photodissociation regions (PDRs) table3.dat 38 638 HI measurements, incident fluxes and volume densities
See also: J/ApJS/149/343 : Giant molecular clouds in M33 (Engargiola+, 2003) J/A+A/426/119 : RCW 106 Giant Molecular Cloud 1.2mm maps (Mookerjea+, 2004) J/MNRAS/353/1025 : JHK photometry of 4 W51 star clusters (Nanda+, 2004) J/MNRAS/367/1609 : RCW 106 Giant Molecular Cloud 13CO mapping (Bains+, 2006) J/MNRAS/379/663 : W3 giant molecular cloud 850um observations (Moore+, 2007) J/A+A/471/103 : SIMBA observations of SMC (Bot+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq [1/76] Source number 4- 5 I2 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 15 F6.3 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 28 F5.2 arcsec DEs Declination (J2000) 30- 33 F4.1 kpc Rgal Galactocentric radius 35- 39 F5.2 10-17W/m2/nm FFUV FUV Flux (in 10-15erg/cm2/s/Å) 41- 42 I2 arcsec Ap Aperture 44 I1 10+19cm-2 GrS Grayscale start 46- 49 F4.2 --- Inc Grayscale level increment (1)
Note (1): (next contour) = (previous contour) * (grayscale level increment)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq [1/76] Source number 3 A1 --- Patch [a-o] Patch number (letter) 5- 7 I3 pc rho Separation UV-HI patch 9- 13 F5.2 10+20cm-2 NHI HI column density 15- 19 F5.2 --- G0 Incident flux G0 21- 26 F6.2 --- GGbg G/Gbg source contrast 28- 34 F7.2 cm-3 n Total H volume density 36- 38 F3.1 --- Err Fractional error
Acknowledgements: J.S. Heiner, heiner(at)
(End) J.S. Heiner [Kapteyn Astron. Inst.], Patricia Vannier [CDS] 09-Aug-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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