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STAR CLUSTER PROPER...
STAR CLUSTER PROPERTIES IN TWO LEGUS GALAXIES COMPUTED WITH STOCHASTIC STELLAR POPULATION SYNTHESIS MODELS
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- Krumholz, Mark R. (author)
- Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA.
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- Adamo, Angela (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC),Stockholm Univ, Dept Astron, Oskar Klein Ctr, SE-10691 Stockholm, Sweden.,Heidelberg Univ, Inst Theoret Astrophys, Ctr Astron, Heidelberg, Germany.;Max Planck Inst Astron, D-69117 Heidelberg, Germany.
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- Fumagalli, Michele (author)
- Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England.;Univ Durham, Ctr Extragalact Astron, Dept Phys, Durham DH1 3LE, England.
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- Wofford, Aida (author)
- Inst Astrophys Paris, F-75014 Paris, France.
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- Calzetti, Daniela (author)
- Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA.
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- Lee, Janice C. (author)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Whitmore, Bradley C. (author)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Bright, Stacey N. (author)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Grasha, Kathryn (author)
- Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA.
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Gouliermis, Dimitrios A. (author)
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- Kim, Hwihyun (author)
- Korea Astron & Space Sci Inst, Daejeon, South Korea.;Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.
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- Nair, Preethi (author)
- Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA.
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- Ryon, Jenna E. (author)
- Univ Wisconsin, Dept Astron, Madison, WI 53706 USA.
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- Smith, Linda J. (author)
- European Space Agcy, Space Telescope Sci Inst, Baltimore, MD USA.
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- Thilker, David (author)
- Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
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- Ubeda, Leonardo (author)
- Space Telescope Sci Inst, Baltimore, MD 21218 USA.
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- Zackrisson, Erik (author)
- Uppsala universitet,Institutionen för fysik och astronomi
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Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA Institutionen för astronomi (creator_code:org_t)
- 2015
- 2015
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 812:2
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- We investigate a novel Bayesian analysis method, based on the Stochastically Lighting Up Galaxies (slug) code, to derive the masses, ages, and extinctions of star clusters from integrated light photometry. Unlike many analysis methods, slug correctly accounts for incomplete initial mass function (IMF) sampling, and returns full posterior probability distributions rather than simply probability maxima. We apply our technique to 621 visually confirmed clusters in two nearby galaxies, NGC 628 and NGC 7793, that are part of the Legacy Extragalactic UV Survey (LEGUS). LEGUS provides Hubble Space Telescope photometry in the NUV, U, B, V, and I bands. We analyze the sensitivity of the derived cluster properties to choices of prior probability distribution, evolutionary tracks, IMF, metallicity, treatment of nebular emission, and extinction curve. We find that slug's results for individual clusters are insensitive to most of these choices, but that the posterior probability distributions we derive are often quite broad, and sometimes multi-peaked and quite sensitive to the choice of priors. In contrast, the properties of the cluster population as a whole are relatively robust against all of these choices. We also compare our results from slug to those derived with a conventional non-stochastic fitting code, Yggdrasil. We show that slug's stochastic models are generally a better fit to the observations than the deterministic ones used by Yggdrasil. However, the overall properties of the cluster populations recovered by both codes are qualitatively similar.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: individual (NGC 628
- NGC 7793)
- galaxies: star clusters: general
- methods: data analysis
- methods: statistical
- techniques: photometric
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Krumholz, Mark R ...
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Adamo, Angela
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Fumagalli, Miche ...
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Wofford, Aida
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Calzetti, Daniel ...
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Lee, Janice C.
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Whitmore, Bradle ...
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Bright, Stacey N ...
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Grasha, Kathryn
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Gouliermis, Dimi ...
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Kim, Hwihyun
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Nair, Preethi
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Ryon, Jenna E.
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Smith, Linda J.
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Thilker, David
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Ubeda, Leonardo
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Zackrisson, Erik
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astrophysical Jo ...
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Stockholm University
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Uppsala University