The volume densities of giant molecular clouds in M83

J. S. Heiner; R. J. Allen; O. I. Wong; P. C. van der Kruit

doi:10.1051/0004-6361:200810430

The volume densities of giant molecular clouds in M83

J. S. Heiner^*, R. J. Allen, O. I. Wong, P. C. van der Kruit

^*Corresponding author voor dit werk

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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 0.1-400 cm(-3) inside R(25), 0.5-50 cm(-3) outside R(25). 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.

Originele taal-2	English
Pagina's (van-tot)	533–541
Aantal pagina's	22
Tijdschrift	Astronomy & Astrophysics
Volume	489
Nummer van het tijdschrift	2
DOI's	https://doi.org/10.1051/0004-6361:200810430
Status	Published - okt.-2008

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M83 volume densities of giant molecular clouds
Heiner, J. (Contributor), Allen, R. J. (Contributor), Ivy Wong, O. (Contributor) & van der Kruit, P. (Contributor), University of Groningen, 30-sep.-2008
DOI: 10.26093/cds/vizier.34890533
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@article{9dc26b9d9b574b6c87dfeab1aa335cfd,

title = "The volume densities of giant molecular clouds in M83",

abstract = "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 0.1-400 cm(-3) inside R(25), 0.5-50 cm(-3) outside R(25). 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.",

keywords = "galaxies : individual : M83, galaxies : ISM, ISM : clouds, ISM : molecules, ultraviolet : galaxies, radio lines : galaxies, LARGE-SCALE DISSOCIATION, OPTICAL SPECTROSCOPY, NEARBY GALAXIES, SPIRAL GALAXIES, STAR-FORMATION, 1-0 EMISSION, HII-REGIONS, GAS, PHOTODISSOCIATION, TELESCOPE",

author = "Heiner, {J. S.} and Allen, {R. J.} and Wong, {O. I.} and {van der Kruit}, {P. C.}",

year = "2008",

month = oct,

doi = "10.1051/0004-6361:200810430",

language = "English",

volume = "489",

pages = "533–541",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = " EDP Sciences",

number = "2",

}

TY - JOUR

T1 - The volume densities of giant molecular clouds in M83

AU - Heiner, J. S.

AU - Allen, R. J.

AU - Wong, O. I.

AU - van der Kruit, P. C.

PY - 2008/10

Y1 - 2008/10

N2 - 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 0.1-400 cm(-3) inside R(25), 0.5-50 cm(-3) outside R(25). 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.

AB - 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 0.1-400 cm(-3) inside R(25), 0.5-50 cm(-3) outside R(25). 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.

KW - galaxies : individual : M83

KW - galaxies : ISM

KW - ISM : clouds

KW - ISM : molecules

KW - ultraviolet : galaxies

KW - radio lines : galaxies

KW - LARGE-SCALE DISSOCIATION

KW - OPTICAL SPECTROSCOPY

KW - NEARBY GALAXIES

KW - SPIRAL GALAXIES

KW - STAR-FORMATION

KW - 1-0 EMISSION

KW - HII-REGIONS

KW - GAS

KW - PHOTODISSOCIATION

KW - TELESCOPE

U2 - 10.1051/0004-6361:200810430

DO - 10.1051/0004-6361:200810430

M3 - Article

SN - 0004-6361

VL - 489

SP - 533

EP - 541

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

IS - 2

ER -

The volume densities of giant molecular clouds in M83

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M83 volume densities of giant molecular clouds

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