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Star-forming clumps in the Lyman Alpha Reference Sample of galaxies - I. Photometric analysis and dumpiness
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 72019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 3, p. 4238-4260Article in journal (Refereed) Published
Abstract [en]

We study young star-forming clumps on physical scales of 10-500 pc in the Lyman-Alpha Reference Sample (LARS), a collection of low-redshift (z = 0.03-0.2) UV-selected star forming galaxies. In each of the 14 galaxies of the sample, we detect clumps for which we derive sizes and magnitudes in five UV-optical filters, The final sample includes 1400 clumps, of which 600 have magnitude uncertainties below 0.3 in all filters. The UV luminosity function for the total sample of clumps is described by a power law with slope 0, = 2.031:111. Clumps in the LARS galaxies have on average L'SFR values higher than what is observed in II 11 regions of local galaxies and comparable to typical star formation rate (SFR) densities of clumps in = 1-3 galaxies. We derive the dumpiness as the relative contribution from clumps to the UV emission of each galaxy, and study it as a function of galactic-scale properties, i.e. E SFR and the ratio between rotational and dispersion velocities of the gas ( vsio-0). We find that in galaxies with higher EsFR or lower vskr 0, clumps dominate the UV emission of their host systems. All LARS galaxies with Ly cy escape fractions larger than 10% have more than 50% of the UV luminosity from clumps. We tested the robustness of these results against the effect of different physical resolutions, At low resolution, the measured dumpiness appears more elevated than if we could resolve clumps down to single clusters. This effect is small in the redshift range covered by LARS; thus, our results are not driven by the physical resolution.

Place, publisher, year, edition, pages
2019. Vol. 487, no 3, p. 4238-4260
Keywords [en]
galaxies: starburst galaxies: star clusters: general galaxies: star formation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-171682DOI: 10.1093/mnras/stz1337ISI: 000478053200095OAI: oai:DiVA.org:su-171682DiVA, id: diva2:1344504
Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved

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Messa, MatteoAdamo, AngelaÖstlin, GöranMelinder, JensHayes, Matthew
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astronomy, Astrophysics and Cosmology

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