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Looking for Obscured Young Star Clusters in NGC 1313
- Messa, Matteo (author)
- Calzetti, Daniela (author)
-
- Adamo, Angela (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Grasha, Kathryn (author)
- Johnson, Kelsey E. (author)
- Sabbi, Elena (author)
- Smith, Linda J. (author)
- Bajaj, Varun (author)
- Finn, Molly K. (author)
- Lin, Zesen (author)
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- (creator_code:org_t)
- 2021-03-11
- 2021
- English.
- In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 909:2
- Journal article (peer-reviewed)
Abstract
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- Using recently acquired Hubble Space Telescope NIR observations (J, Pa beta, and H bands) of the nearby galaxy NGC 1313, we investigate the timescales required by a young star cluster to emerge from its natal cloud. We search for extincted star clusters, potentially embedded in their natal cloud as either (1) compact sources in regions with high H alpha/Pa beta extinctions or (2) compact H II regions that appear as point-like sources in the Pa beta emission map. The NUV-optical-NIR photometry of the candidate clusters is used to derive their ages, masses, and extinctions via a least-chi(2) spectral energy distribution broad- and narrowband fitting process. The 100 clusters in the final samples have masses in the range log10(M M-circle dot) = 2.5-3.5 and moderate extinctions, E(B - V) less than or similar to 1.0 mag. Focusing on the young clusters (0-6Myr), we derive a weak correlation between extinction and age of the clusters. Almost half of the clusters have low extinctions, E(B - V) < 0.25 mag, already at very young ages (<= 3Myr), suggesting that dust is quickly removed from clusters. A stronger correlation is found between the morphology of the nebular emission (compact, partial or absent, both in H alpha and Pa beta) and cluster age. Relative fractions of clusters associated with a specific nebular morphology are used to estimate the typical timescales for clearing the natal gas cloud, resulting in between 3 and 5Myr, similar to 1Myr older than what was estimated from NUV-optical-based cluster studies. This difference hints at a bias for optical-only-based studies, which James Webb Space Telescope will address in the coming years.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- ref (subject category)
- art (subject category)
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- Finn, Molly K.
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