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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
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Hannon, Stephen (author)
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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, Angela (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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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, Lorenza (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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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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(creator_code:org_t)
- 2019-10-12
- 2019
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 490:4, s. 4648-4665
- Related links:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- ISM: H II regions
- ISM: evolution
- galaxies: star clusters
- galaxies: ISM
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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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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show more...
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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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Stockholm University