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dc.contributor.authorFoster, Jonathan B.
dc.contributor.authorMandel, Kaisey Stephen
dc.contributor.authorPineda, Jaime
dc.contributor.authorCovey, Kevin R.
dc.contributor.authorArce, Hector G.
dc.contributor.authorGoodman, Alyssa
dc.date.accessioned2014-02-20T15:39:46Z
dc.date.issued2013
dc.identifier.citationFoster, Jonathan B., Kaisey Stephen Mandel, Jaime Pineda, Kevin R. Covey, Héctor G. Arce, and Alyssa A. Goodman. 2013. Evidence for grain growth in molecular clouds: A Bayesian examination of the extinction law in Perseus. Monthly Notices of the Royal Astronomical Society 428(2): 1606-1622.en_US
dc.identifier.issn0035-8711en_US
dc.identifier.issn1365-2966en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:11726235
dc.description.abstractWe investigate the shape of the extinction law in two \(1^{\circ}\) square fields of the Perseus molecular cloud complex. We combine deep red-optical (r, i and z band) observations obtained using Megacam on the MMT with UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey near-infrared (J, H and K band) data to measure the colours of background stars. We develop a new hierarchical Bayesian statistical model, including measurement error, intrinsic colour variation, spectral type and dust reddening, to simultaneously infer parameters for individual stars and characteristics of the population. We implement an efficient Markov chain Monte Carlo algorithm utilizing generalized Gibbs sampling to compute coherent probabilistic inferences. We find a strong correlation between the extinction \((A_V)\) and the slope of the extinction law (parametrized by \(R_V)\). Because the majority of the extinction towards our stars comes from the Perseus molecular cloud, we interpret this correlation as evidence of grain growth at moderate optical depths. The extinction law changes from the ‘diffuse’ value of \(R_V \sim 3\) to the 'dense cloud' value of \(R_V \sim 5\) as the column density rises from \(A_V = 2\) to 10 mag. This relationship is similar for the two regions in our study, despite their different physical conditions, suggesting that dust grain growth is a fairly universal process.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherRoyal Astronomical Societyen_US
dc.relation.isversionofdoi:10.1093/mnras/sts144en_US
dc.relation.hasversionhttp://arxiv.org/abs/1210.2391en_US
dash.licenseOAP
dc.subjectstatistical methodsen_US
dc.subjectISM cloudsen_US
dc.subjectdusten_US
dc.subjectextinctionen_US
dc.titleEvidence for Grain Growth in Molecular Clouds: A Bayesian Examination of the Extinction Law in Perseusen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalMonthly Notices of the Royal Astronomical Societyen_US
dash.depositing.authorGoodman, Alyssa
dc.date.available2014-02-20T15:39:46Z
dc.identifier.doi10.1093/mnras/sts144*
dash.contributor.affiliatedMandel, Kaisey
dash.contributor.affiliatedPineda, Jaime
dash.contributor.affiliatedGoodman, Alyssa


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