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Synthetic photometr...
Synthetic photometry of OB star clusters with stochastically sampled IMFs : analysis of models and HST observations
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Orozco-Duarte, Rogelio (författare)
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Wofford, Aida (författare)
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Vidal-García, Alba (författare)
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Bruzual, Gustavo (författare)
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Charlot, Stephane (författare)
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Krumholz, Mark R. (författare)
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Hannon, Stephen (författare)
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Lee, Janice (författare)
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Wofford, Timothy (författare)
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Fumagalli, Michele (författare)
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Dale, Daniel (författare)
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- Messa, Matteo (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Université de Genève, Switzerland
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Grebel, Eva K. (författare)
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Smith, Linda (författare)
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Grasha, Kathryn (författare)
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Cook, David (författare)
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(creator_code:org_t)
- 2021-10-19
- 2022
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 509:1, s. 522-549
- Relaterad länk:
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https://hal.sorbonne...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present a pilot library of synthetic NUV, U, B, V, and I photometry of star clusters with stochastically sampled IMFs and ionized gas for initial masses, Mi = 103, 104, and 105 M⊙; t = 1, 3, 4, and 8 Myr; Z = 0.014 and Z = 0.002; and log(US) = −2 and −3. We compare the library with predictions from deterministic models and observations of isolated low-mass (<104 M⊙) star clusters with co-spatial compact H II regions. The clusters are located in NGC 7793, one of the nearest galaxies observed as part of the HST LEGUS and Hα-LEGUS surveys. (1) For model magnitudes that only account for the stars: (a) the residual |deterministic mag - median stochastic mag| can be ≥0.5 mag, even for Mi = 105 M⊙; and (b) the largest spread in stochastic magnitudes occurs when Wolf–Rayet stars are present. (2) For Mi = 105 M⊙: (a) the median stochastic mag with gas can be >1.0 mag more luminous than the median stochastic magnitude without gas; and (b) nebular emission lines can contribute with >50 per cent and >30 per cent to the total emission in the V and I bands, respectively. (3) Age-dating OB-star clusters via deterministic tracks in the U-B versus V-I plane is highly uncertain at Z = 0.014 for Mi ∼ 103 M⊙ and Z = 0.002 for Mi ∼ 103–105 M⊙. (4) For low-mass clusters, the V-band extinction derived with stochastic models significantly depends on the value of log(US). (5) The youngest clusters tend to have higher extinction. (6) The majority of clusters have multi-peaked age PDFs. (7) Finally, we discuss the importance of characterizing the true variance in the number of stars per mass bin in nature.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- methods: data analysis
- stars: luminosity function
- mass function
- (ISM:) HII regions
- galaxies: ISM
- galaxies: stellar content
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- ref (ämneskategori)
- art (ämneskategori)
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- Av författaren/redakt...
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Orozco-Duarte, R ...
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Wofford, Aida
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Vidal-García, Al ...
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Bruzual, Gustavo
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Charlot, Stephan ...
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Krumholz, Mark R ...
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visa fler...
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Hannon, Stephen
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Lee, Janice
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Wofford, Timothy
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Fumagalli, Miche ...
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Dale, Daniel
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Messa, Matteo
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Grebel, Eva K.
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Smith, Linda
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Grasha, Kathryn
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Cook, David
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visa färre...
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