PMO OpenIR  > 星系中的恒星形成研究团组
A comparison of approaches in fitting continuum SEDs
Liu, Yao1,2,3,4; Madlener, David4; Wolf, Sebastian4; Wang, Hong-Chi1,2
2013-04-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume13Issue:4Pages:420-434
Corresponding AuthorLiu, Y (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China. Email: yliu@pmo.ac.cn
AbstractWe present a detailed comparison of two approaches, the use of a pre-calculated database and simulated annealing (SA), for fitting the continuum spectral energy distribution (SED) of astrophysical objects whose appearance is dominated by surrounding dust. While pre-calculated databases are commonly used to model SED data, only a few studies to date employed SA due to its unclear accuracy and convergence time for this specific problem. From a methodological point of view, different approaches lead to different fitting quality, demand on computational resources and calculation time. We compare the fitting quality and computational costs of these two approaches for the task of SED fitting to provide a guide to the practitioner to find a compromise between desired accuracy and available resources. To reduce uncertainties inherent to real datasets, we introduce a reference model resembling a typical circumstellar system with 10 free parameters. We derive the SED of the reference model with our code MC3D at 78 logarithmically distributed wavelengths in the range [0.3 mu m, 1.3 mm] and use this setup to simulate SEDs for the database and SA. Our result directly demonstrates the applicability of SA in the field of SED modeling, since the algorithm regularly finds better solutions to the optimization problem than a pre-calculated database. As both methods have advantages and shortcomings, a hybrid approach is preferable. While the database provides an approximate fit and overall probability distributions for all parameters deduced using Bayesian analysis, SA can be used to improve upon the results returned by the model grid.
KeywordMethods: Numerical Radiative Transfer Protoplanetary Disks
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/13/4/005
WOS KeywordSPECTRAL ENERGY-DISTRIBUTIONS ; YOUNG STELLAR OBJECTS ; T TAURI STARS ; PROTOPLANETARY DISKS ; CIRCUMSTELLAR DISKS ; RADIATIVE-TRANSFER ; DUST ; CONSTRAINTS ; MODELS ; OPTIMIZATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000316788000005
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9880
Collection星系中的恒星形成研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
4.Univ Kiel, Inst Theoret Phys & Astrophys, D-24118 Kiel, Germany
Recommended Citation
GB/T 7714
Liu, Yao,Madlener, David,Wolf, Sebastian,et al. A comparison of approaches in fitting continuum SEDs[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(4):420-434.
APA Liu, Yao,Madlener, David,Wolf, Sebastian,&Wang, Hong-Chi.(2013).A comparison of approaches in fitting continuum SEDs.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(4),420-434.
MLA Liu, Yao,et al."A comparison of approaches in fitting continuum SEDs".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.4(2013):420-434.
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