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The spatial relation between young star clusters and molecular clouds in M51 with LEGUS

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Abstract
We present a study correlating the spatial locations of young star clusters with those of molecular clouds in NGC 5194, in order to investigate the time-scale over which clusters separate from their birth clouds. The star cluster catalogues are from the Legacy ExtraGalactic UV Survey (LEGUS) and the molecular clouds from the Plateau de Bure Interefrometer Arcsecond Whirpool Survey (PAWS). We find that younger star clusters are spatially closer to molecular clouds than older star clusters. The median age for clusters associated with clouds is 4 Myr, whereas it is 50 Myr for clusters that are sufficiently separated from a molecular cloud to be considered unassociated. After similar to 6 Myr, the majority of the star clusters lose association with their molecular gas. Younger star clusters are also preferentially located in stellar spiral arms where they are hierarchically distributed in kpc-size regions for 50-100 Myr before dispersing. The youngest star clusters are more strongly clustered, yielding a two-point correlation function with alpha = -0.28 +/- 0.04, than the giant molecular cloud (GMCs) (alpha = -0.09 +/- 0.03) within the same PAWS field. However, the clustering strength of the most massive GMCs, supposedly the progenitors of the young clusters for a star formation efficiency of a few percent, is comparable (alpha = -0.35 +/- 0.05) to that of the clusters. We find a galactocentric dependence for the coherence of star formation, in which clusters located in the inner region of the galaxy reside in smaller star-forming complexes and display more homogeneous distributions than clusters further from the centre. This result suggests a correlation between the survival of a cluster complex and its environment.
Keywords
DUST CONTINUUM EMISSION, C2D LEGACY CLOUDS, INTERSTELLAR-MEDIUM, FRACTAL, STRUCTURE, MILKY-WAY, LUMINOSITY FUNCTION, CLUMP DISTRIBUTION, SYNTHESIS, MODELS, BOLOCAM SURVEY, 850 MICRONS, ISM: clouds, galaxies: individual (NGC 5194, M 51), galaxies: star, clusters: general, galaxies: star formation, galaxies: stellar content, galaxies: structure

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Chicago
Grasha, K., D. Calzetti, A. Adamo, R. C. Kennicutt, B. G. Elmegreen, M. Messa, D. A. Dale, et al. 2019. “The Spatial Relation Between Young Star Clusters and Molecular Clouds in M51 with LEGUS.” Monthly Notices of the Royal Astronomical Society 483 (4): 4707–4723.
APA
Grasha, K., Calzetti, D., Adamo, A., Kennicutt, R. C., Elmegreen, B. G., Messa, M., Dale, D. A., et al. (2019). The spatial relation between young star clusters and molecular clouds in M51 with LEGUS. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 483(4), 4707–4723.
Vancouver
1.
Grasha K, Calzetti D, Adamo A, Kennicutt RC, Elmegreen BG, Messa M, et al. The spatial relation between young star clusters and molecular clouds in M51 with LEGUS. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. Oxford: Oxford Univ Press; 2019;483(4):4707–23.
MLA
Grasha, K. et al. “The Spatial Relation Between Young Star Clusters and Molecular Clouds in M51 with LEGUS.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 483.4 (2019): 4707–4723. Print.
@article{8622199,
  abstract     = {We present a study correlating the spatial locations of young star clusters with those of molecular clouds in NGC 5194, in order to investigate the time-scale over which clusters separate from their birth clouds. The star cluster catalogues are from the Legacy ExtraGalactic UV Survey (LEGUS) and the molecular clouds from the Plateau de Bure Interefrometer Arcsecond Whirpool Survey (PAWS). We find that younger star clusters are spatially closer to molecular clouds than older star clusters. The median age for clusters associated with clouds is 4 Myr, whereas it is 50 Myr for clusters that are sufficiently separated from a molecular cloud to be considered unassociated. After similar to 6 Myr, the majority of the star clusters lose association with their molecular gas. Younger star clusters are also preferentially located in stellar spiral arms where they are hierarchically distributed in kpc-size regions for 50-100 Myr before dispersing. The youngest star clusters are more strongly clustered, yielding a two-point correlation function with alpha = -0.28 +/- 0.04, than the giant molecular cloud (GMCs) (alpha = -0.09 +/- 0.03) within the same PAWS field. However, the clustering strength of the most massive GMCs, supposedly the progenitors of the young clusters for a star formation efficiency of a few percent, is comparable (alpha = -0.35 +/- 0.05) to that of the clusters. We find a galactocentric dependence for the coherence of star formation, in which clusters located in the inner region of the galaxy reside in smaller star-forming complexes and display more homogeneous distributions than clusters further from the centre. This result suggests a correlation between the survival of a cluster complex and its environment.},
  author       = {Grasha, K. and Calzetti, D. and Adamo, A. and Kennicutt, R. C. and Elmegreen, B. G. and Messa, M. and Dale, D. A. and Fedorenko, K. and Mahadevan, S. and Grebel, E. K. and Fumagalli, M. and Kim, H. and Dobbs, C. L. and Gouliermis, D. A. and Ashworth, G. and Gallagher, J. S., III and Smith, L. J. and Tosi, M. and Whitmore, B. C. and Schinnerer, E. and Colombo, D. and Hughes, A. and Leroy, A. K. and van der Wel, Sharon Meidt},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {DUST CONTINUUM EMISSION,C2D LEGACY CLOUDS,INTERSTELLAR-MEDIUM,FRACTAL,STRUCTURE,MILKY-WAY,LUMINOSITY FUNCTION,CLUMP DISTRIBUTION,SYNTHESIS,MODELS,BOLOCAM SURVEY,850 MICRONS,ISM: clouds,galaxies: individual (NGC 5194,M 51),galaxies: star,clusters: general,galaxies: star formation,galaxies: stellar content,galaxies: structure},
  language     = {eng},
  number       = {4},
  pages        = {4707--4723},
  publisher    = {Oxford Univ Press},
  title        = {The spatial relation between young star clusters and molecular clouds in M51 with LEGUS},
  url          = {http://dx.doi.org/10.1093/mnras/sty3424},
  volume       = {483},
  year         = {2019},
}

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