Change search
ReferencesLink to record
Permanent link

Direct link
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Max Planck Society, Germany.
Show others and affiliations
Number of Authors: 22
2014 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 787, no 1, L15- p.Article in journal (Refereed) Published
Abstract [en]

Hierarchical structure in ultraviolet images of 12 late-type LEGUS galaxies is studied by determining the numbers and fluxes of nested regions as a function of size from similar to 1 to similar to 200 pc, and the number as a function of flux. Two starburst dwarfs, NGC 1705 and NGC 5253, have steeper number-size and flux-size distributions than the others, indicating high fractions of the projected areas filled with star formation. Nine subregions in seven galaxies have similarly steep number-size slopes, even when the whole galaxies have shallower slopes. The results suggest that hierarchically structured star-forming regions several hundred parsecs or larger represent common unit structures. Small galaxies dominated by only a few of these units tend to be starbursts. The self-similarity of young stellar structures down to parsec scales suggests that star clusters form in the densest parts of a turbulent medium that also forms loose stellar groupings on larger scales. The presence of super star clusters in two of our starburst dwarfs would follow from the observed structure if cloud and stellar subregions more readily coalesce when self-gravity in the unit cell contributes more to the total gravitational potential.

Place, publisher, year, edition, pages
2014. Vol. 787, no 1, L15- p.
Keyword [en]
galaxies: ISM, galaxies: star clusters: general, ISM: structure, stars: formation
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-105197DOI: 10.1088/2041-8205/787/1/L15ISI: 000336035800015OAI: diva2:732437


Available from: 2014-07-04 Created: 2014-06-24 Last updated: 2014-07-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Adamo, Angela
By organisation
Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 17 hits
ReferencesLink to record
Permanent link

Direct link