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STAR CLUSTER PROPER...
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Krumholz, Mark R.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA.
(författare)
STAR CLUSTER PROPERTIES IN TWO LEGUS GALAXIES COMPUTED WITH STOCHASTIC STELLAR POPULATION SYNTHESIS MODELS
- Artikel/kapitelEngelska2015
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Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:su-125020
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-125020URI
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https://doi.org/10.1088/0004-637X/812/2/147DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-270639URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Adamo, AngelaStockholms 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.(Swepub:su)anad2127
(författare)
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Fumagalli, MicheleUniv Durham, Inst Computat Cosmol, Durham DH1 3LE, England.;Univ Durham, Ctr Extragalact Astron, Dept Phys, Durham DH1 3LE, England.
(författare)
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Wofford, AidaInst Astrophys Paris, F-75014 Paris, France.
(författare)
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Calzetti, DanielaUniv Massachusetts, Dept Astron, Amherst, MA 01003 USA.
(författare)
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Lee, Janice C.Space Telescope Sci Inst, Baltimore, MD 21218 USA.
(författare)
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Whitmore, Bradley C.Space Telescope Sci Inst, Baltimore, MD 21218 USA.
(författare)
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Bright, Stacey N.Space Telescope Sci Inst, Baltimore, MD 21218 USA.
(författare)
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Grasha, KathrynUniv Massachusetts, Dept Astron, Amherst, MA 01003 USA.
(författare)
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Gouliermis, Dimitrios A.
(författare)
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Kim, HwihyunKorea Astron & Space Sci Inst, Daejeon, South Korea.;Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.
(författare)
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Nair, PreethiUniv Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA.
(författare)
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Ryon, Jenna E.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA.
(författare)
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Smith, Linda J.European Space Agcy, Space Telescope Sci Inst, Baltimore, MD USA.
(författare)
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Thilker, DavidJohns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
(författare)
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Ubeda, LeonardoSpace Telescope Sci Inst, Baltimore, MD 21218 USA.
(författare)
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Zackrisson, ErikUppsala universitet,Institutionen för fysik och astronomi(Swepub:uu)erzac792
(författare)
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Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA.Institutionen för astronomi
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Sammanhörande titlar
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Ingår i:Astrophysical Journal812:20004-637X1538-4357
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- Av författaren/redakt...
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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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visa fler...
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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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visa färre...
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