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Legacy ExtraGalactic UV Survey with The Hubble Space Telescope: Stellar Cluster Catalogs and First Insights Into Cluster Formation and Evolution in NGC 628
Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden..
Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.;Univ Wisconsin Madison, Dept Astron, Madison, WI USA..
Stockholm Univ, Oskar Klein Ctr, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden..
Gemini Observ, La Serena, Chile..
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2017 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 841, no 2, 131Article in journal (Refereed) Published
Abstract [en]

We report the large effort that is producing comprehensive high-level young star cluster (YSC) catalogs for a significant fraction of galaxies observed with the Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. We present the methodology developed to extract cluster positions, verify their genuine nature, produce multiband photometry (from NUV to NIR), and derive their physical properties via spectral energy distribution fitting analyses. We use the nearby spiral galaxy NGC 628 as a test case for demonstrating the impact that LEGUS will have on our understanding of the formation and evolution of YSCs and compact stellar associations within their host galaxy. Our analysis of the cluster luminosity function from the UV to the NIR finds a steepening at the bright end and at all wavelengths suggesting a dearth of luminous clusters. The cluster mass function of NGC 628 is consistent with a power-law distribution of slopes similar to-2 and a truncation of a few times 10(5) M-circle dot. After their formation, YSCs and compact associations follow different evolutionary paths. YSCs survive for a longer time frame, confirming their being potentially bound systems. Associations disappear on timescales comparable to hierarchically organized star-forming regions, suggesting that they are expanding systems. We find massindependent cluster disruption in the inner region of NGC 628, while in the outer part of the galaxy there is little or no disruption. We observe faster disruption rates for low mass (<= 10(4) M-circle dot) clusters, suggesting that a massdependent component is necessary to fully describe the YSC disruption process in NGC 628.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 841, no 2, 131
Keyword [en]
galaxies: individual (NGC 628, M74), galaxies: star clusters: general, galaxies: star formation, stars: formation
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-327133DOI: 10.3847/1538-4357/aa7132ISI: 000402725700007OAI: oai:DiVA.org:uu-327133DiVA: diva2:1137098
Funder
The Royal Swedish Academy of Sciences
Available from: 2017-08-30 Created: 2017-08-30 Last updated: 2017-08-30Bibliographically approved

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Zackrisson, Erik

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