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H α morphologies of...
H α morphologies of star clusters : a LEGUS study of H II region evolution time-scales and stochasticity in low-mass clusters
- Article/chapterEnglish2019
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2019-10-12
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Oxford University Press (OUP),2019
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LIBRIS-ID:oai:DiVA.org:su-178720
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-178720URI
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https://doi.org/10.1093/mnras/stz2820DOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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The morphology of H II regions around young star clusters provides insight into the time-scales and physical processes that clear a cluster's natal gas. We study similar to 700 young clusters (<= 10 Myr) in three nearby spiral galaxies (NGC 7793, NGC 4395, and NGC 1313) using Hubble Space Telescope (HST) imaging from LEGUS (Legacy ExtraGalactic Ultraviolet Survey). Clusters are classified by their H alpha morphology (concentrated, partially exposed, no-emission) and whether they have neighbouring clusters (which could affect the clearing time-scales). Through visual inspection of the HST images, and analysis of ages, reddenings, and stellar masses from spectral energy distributions fitting, together with the (U - B), (V - I) colours, we find (1) the median ages indicate a progression from concentrated (similar to 3Myr), to partially exposed (similar to 4Myr), to no H alpha emission (>5Myr), consistent with the expected temporal evolution of H II regions and previous results. However, (2) similarities in the age distributions for clusters with concentrated and partially exposed H alpha morphologies imply a short time-scale for gas clearing (less than or similar to 1 Myr). Also, (3) our cluster sample's median mass is similar to 1000 M-circle dot, and a significant fraction (similar to 20 per cent) contain one or more bright red sources (presumably supergiants), which can mimic reddening effects. Finally, (4) the median E(B - V) values for clusters with concentrated H alpha and those without H alpha emission appear to be more similar than expected (similar to 0.18 versus similar to 0.14, respectively), but when accounting for stochastic effects, clusters without H alpha emission are less reddened. To mitigate stochastic effects, we experiment with synthesizing more massive clusters by stacking fluxes of clusters within each H alpha morphological class. Composite isolated clusters also reveal a colour and age progression for H alpha morphological classes, consistent with analysis of the individual clusters.
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Lee, Janice C.
(author)
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Whitmore, B. C.
(author)
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Chandar, R.
(author)
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Adamo, AngelaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)anad2127
(author)
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Mobasher, B.
(author)
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Aloisi, A.
(author)
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Calzetti, D.
(author)
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Cignoni, M.
(author)
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Cook, D. O.
(author)
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Dale, D.
(author)
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Deger, S.
(author)
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Della Bruna, LorenzaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)lode4798
(author)
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Elmegreen, D. M.
(author)
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Gouliermis, D. A.
(author)
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Grasha, K.
(author)
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Grebel, E. K.
(author)
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Herrero, A.
(author)
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Hunter, D. A.
(author)
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Johnson, K. E.
(author)
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Kennicutt, R.
(author)
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Kim, H.
(author)
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Sacchi, E.
(author)
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Smith, L.
(author)
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Thilker, D.
(author)
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Turner, J.
(author)
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Walterbos, R. A. M.
(author)
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Wofford, A.
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)490:4, s. 4648-46650035-87111365-2966
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Hannon, Stephen
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Lee, Janice C.
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Whitmore, B. C.
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Chandar, R.
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Adamo, Angela
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Mobasher, B.
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Aloisi, A.
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Calzetti, D.
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Cignoni, M.
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Cook, D. O.
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Dale, D.
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Deger, S.
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Della Bruna, Lor ...
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Elmegreen, D. M.
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Gouliermis, D. A ...
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Grasha, K.
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Grebel, E. K.
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Herrero, A.
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Hunter, D. A.
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Johnson, K. E.
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Kennicutt, R.
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Kim, H.
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Sacchi, E.
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Smith, L.
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Thilker, D.
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Turner, J.
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Walterbos, R. A. ...
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Wofford, A.
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Stockholm University