Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC

Natalia Kudryavtseva, Wolfgang Brandner, Mario Gennaro, Boyke Rochau, Andrea Stolte, Morten Andersen, Nicola Da Rio, Thomas Henning, Emanuele Tognelli, David Hogg, Simon Clark, Rens Waters

    Research output: Contribution to journalArticle

    Abstract

    We present a new method to determine the age spread of resolved stellar populations in a starburst cluster. The method relies on a two-step process. In the first step, kinematic members of the cluster are identified based on multi-epoch astrometric monitoring. In the second step, a Bayesian analysis is carried out, comparing the observed photometric sequence of cluster members with sets of theoretical isochrones. When applying this methodology to optical and near-infrared high angular resolution Hubble Space Telescope (HST) and adaptive optics observations of the 5Myr old starburst cluster Westerlund1 and 2Myr old starburst cluster NGC3603YC, we derive upper limits for the age spreads of 0.4 and 0.1Myr, respectively. The results strongly suggest that star formation in these starburst clusters happened almost instantaneously.

    Original languageEnglish (US)
    Article numberL44
    JournalAstrophysical Journal Letters
    Volume750
    Issue number2
    DOIs
    StatePublished - May 10 2012

    Fingerprint

    Bayesian analysis
    near infrared
    kinematics
    methodology
    monitoring
    angular resolution
    adaptive optics
    Hubble Space Telescope
    method
    star formation
    time measurement
    high resolution

    Keywords

    • HertzsprungRussell and CM diagrams
    • open clusters and associations: individual (Westerlund 1, NGC 3603 YC)
    • stars: evolution
    • stars: formation

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Kudryavtseva, N., Brandner, W., Gennaro, M., Rochau, B., Stolte, A., Andersen, M., ... Waters, R. (2012). Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC. Astrophysical Journal Letters, 750(2), [L44]. https://doi.org/10.1088/2041-8205/750/2/L44

    Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC. / Kudryavtseva, Natalia; Brandner, Wolfgang; Gennaro, Mario; Rochau, Boyke; Stolte, Andrea; Andersen, Morten; Da Rio, Nicola; Henning, Thomas; Tognelli, Emanuele; Hogg, David; Clark, Simon; Waters, Rens.

    In: Astrophysical Journal Letters, Vol. 750, No. 2, L44, 10.05.2012.

    Research output: Contribution to journalArticle

    Kudryavtseva, N, Brandner, W, Gennaro, M, Rochau, B, Stolte, A, Andersen, M, Da Rio, N, Henning, T, Tognelli, E, Hogg, D, Clark, S & Waters, R 2012, 'Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC', Astrophysical Journal Letters, vol. 750, no. 2, L44. https://doi.org/10.1088/2041-8205/750/2/L44
    Kudryavtseva N, Brandner W, Gennaro M, Rochau B, Stolte A, Andersen M et al. Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC. Astrophysical Journal Letters. 2012 May 10;750(2). L44. https://doi.org/10.1088/2041-8205/750/2/L44
    Kudryavtseva, Natalia ; Brandner, Wolfgang ; Gennaro, Mario ; Rochau, Boyke ; Stolte, Andrea ; Andersen, Morten ; Da Rio, Nicola ; Henning, Thomas ; Tognelli, Emanuele ; Hogg, David ; Clark, Simon ; Waters, Rens. / Instantaneous starburst of the massive clusters westerlund1 and NGC3603YC. In: Astrophysical Journal Letters. 2012 ; Vol. 750, No. 2.
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    AU - Rochau, Boyke

    AU - Stolte, Andrea

    AU - Andersen, Morten

    AU - Da Rio, Nicola

    AU - Henning, Thomas

    AU - Tognelli, Emanuele

    AU - Hogg, David

    AU - Clark, Simon

    AU - Waters, Rens

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    AB - We present a new method to determine the age spread of resolved stellar populations in a starburst cluster. The method relies on a two-step process. In the first step, kinematic members of the cluster are identified based on multi-epoch astrometric monitoring. In the second step, a Bayesian analysis is carried out, comparing the observed photometric sequence of cluster members with sets of theoretical isochrones. When applying this methodology to optical and near-infrared high angular resolution Hubble Space Telescope (HST) and adaptive optics observations of the 5Myr old starburst cluster Westerlund1 and 2Myr old starburst cluster NGC3603YC, we derive upper limits for the age spreads of 0.4 and 0.1Myr, respectively. The results strongly suggest that star formation in these starburst clusters happened almost instantaneously.

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