2008A&A...489..533H


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET10:30:35

2008A&A...489..533H - Astronomy and Astrophysics, volume 489, 533-541 (2008/10-2)

The volume densities of giant molecular clouds in M83.

HEINER J.S., ALLEN R.J., WONG O.I. and VAN DER KRUIT P.C.

Abstract (from CDS):

Using observed GALEX far-ultraviolet (FUV) fluxes and VLA images of the 21-cm HI column 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.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M83 - galaxies: ISM - ISM: clouds - ISM: molecules - ultraviolet: galaxies - radio lines: galaxies

VizieR on-line data: <Available at CDS (J/A+A/489/533): table1.dat table3.dat>

Nomenclature: Table 1: [HAW2008] NN (Nos 1-76). Table 3: [HAW2008] NNa N=638.

Status in Simbad:  will not be processed

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5034 1
2 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3899 5
3 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2168 2
4 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2478 2

    Equat.    Gal    SGal    Ecl

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2019.12.11-10:30:35

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