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A COMPARATIVE STUDY OF GIANT MOLECULAR CLOUDS IN M51, M33, AND THE LARGE MAGELLANIC CLOUD

Open access
Hughes, Annie, Meidt, Sharon E., Colombo, Dario, Schinnerer, Eva, Pety, Jerôme, Leroy, Adam K., Dobbs, Clare L., García-Burillo, Santiago, Thompson, Todd A., Dumas, Gaëlle, Schuster, Karl F., Kramer, Carsten·2013·The Astrophysical Journal

Abstract

We compare the properties of giant molecular clouds (GMCs) in M51 identified by the Plateau de Bure Interferometer Whirlpool Arcsecond Survey with GMCs identified in wide-field, high-resolution surveys of CO emission in M33 and the Large Magellanic Cloud (LMC). We find that GMCs in M51 are larger, brighter, and have higher velocity dispersions relative to their sizes than equivalent structures in M33 and the LMC. These differences imply that there are genuine variations in the average mass surface density of the different GMC populations. To explain this, we propose that the pressure in the interstellar medium surrounding the GMCs plays a role in regulating their density and velocity dispersion. We find no evidence for a correlation between size and linewidth in M51, M33, or the LMC when the CO emission is decomposed into GMCs, although moderately robust correlations are apparent when regions of contiguous CO emission (with no size limitation) are used. Our work demonstrates that observational bias remains an important obstacle to the identification and study of extragalactic GMC populations using CO emission, especially in molecule-rich galactic environments.

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Metadata

Authors
Hughes, A., Meidt, S. E., Colombo, D., Schinnerer, E., Pety, J., Leroy, A. K., Dobbs, C. L., García-Burillo, S., Thompson, T. A., Dumas, G., Schuster, K. F., & Kramer, C.
Venue
The Astrophysical Journal
Published
2013-11-25
Volume
779
Issue
1
Pages
46
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W1966042307
Cited by
190
References
2
FWCI
7.84
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: A COMPARATIVE STUDY OF GIANT MOLECULAR CLOUDS IN M51, M33, AND THE LARGE MAGELLANIC CLOUD. https://app.cochat.ai/papers/10.1088/0004-637x/779/1/46
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Hughes, A., Meidt, S. E., Colombo, D., Schinnerer, E., Pety, J., Leroy, A. K., Dobbs, C. L., García-Burillo, S., Thompson, T. A., Dumas, G., Schuster, K. F., & Kramer, C. (2013). A COMPARATIVE STUDY OF GIANT MOLECULAR CLOUDS IN M51, M33, AND THE LARGE MAGELLANIC CLOUD. The Astrophysical Journal. https://doi.org/10.1088/0004-637x/779/1/46

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.