Recovering stellar population parameters via two full-spectrum fitting algorithms in the absence of model uncertainties
文献类型：期刊论文
| 作者 | Ge, Junqiang4; Yan, Renbin1; Cappellari, Michele2; Mao, Shude3,4,5,6; Li, Hongyu4; Lu, Youjun4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2018-08-01 |
| 卷号 | 478期号:2页码:2633-2649 |
| ISSN号 | 0035-8711 |
| 关键词 | galaxies: evolution galaxies: fundamental parameters galaxies: stellar content |
| DOI | 10.1093/mnras/sty1245 |
| 英文摘要 | Using mock spectra based on Vazdekis/MILES library fitted within the wavelength region 3600-7350 angstrom, we analyse the bias and scatter on the resulting physical parameters induced by the choice of fitting algorithms and observational uncertainties, but avoid effects of thosemodel uncertainties. We consider two full-spectrum fitting codes: PPXF and STARLIGHT, in fitting for stellar population age, metallicity, mass-to-light ratio, and dust extinction. With PPXF, we find that both the bias mu in the population parameters and the scatter sigma in the recovered logarithmic values follows the expected trend mu proportional to sigma proportional to 1/(S/N). The bias increases for younger ages and systematically makes recovered ages older, M-*/L-r larger and metallicities lower than the true values. For reference, at S/N = 30, and for the worst case (t = 10(8) yr), the bias is 0.06 dex in M-*/Lr, 0.03 dex in both age and [M/H]. There is no significant dependence on either E(B-V) or the shape of the error spectrum. Moreover, the results are consistent for both our 1-SSP (simple stellar population) and 2-SSP tests. With the STARLIGHT algorithm, we find trends similar to PPXF, when the input E(B-V) < 0.2mag. However, with larger input E(B-V), the biases of the output parameter do not converge to zero even at the highest S/N and are strongly affected by the shape of the error spectra. This effect is particularly dramatic for youngest age (t = 108 yr), for which all population parameters can be strongly different from the input values, with significantly underestimated dust extinction and [M/H], and larger ages and M-*/Lr. Results degrade when moving from our 1-SSP to the 2-SSP tests. The STARLIGHT convergence to the true values can be improved by increasing Markov Chains and annealing loops to the 'slow mode'. For the same input spectrum, PPXF is about two order of magnitudes faster than STARLIGHT's 'default mode' and about three order of magnitude faster than STARLIGHT's 'slow mode'. |
| WOS关键词 | DIGITAL SKY SURVEY ; BROAD-BAND PHOTOMETRY ; INITIAL MASS FUNCTION ; LYMAN BREAK GALAXIES ; STAR-FORMATION ; ELLIPTIC GALAXIES ; EVOLUTIONARY SYNTHESIS ; SPECTROPHOTOMETRIC EVOLUTION ; RESOLUTION ; LIBRARY |
| 资助项目 | National Natural Science Foundation of China (NSFC)[11473032] ; National Natural Science Foundation of China (NSFC)[11333003] ; National Natural Science Foundation of China (NSFC)[11390372] ; National Natural Science Foundation of China (NSFC)[11690024] ; National Science Foundation[AST-1715898] ; Royal Society |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000439547400090 |
| 资助机构 | National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Science Foundation ; National Science Foundation ; Royal Society ; Royal Society ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Science Foundation ; National Science Foundation ; Royal Society ; Royal Society ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Science Foundation ; National Science Foundation ; Royal Society ; Royal Society ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; National Science Foundation ; National Science Foundation ; Royal Society ; Royal Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/22289]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Ge, Junqiang |
| 作者单位 | 1.Univ Kentucky, Dept Phys & Astron, 505 Rose St, Lexington, KY 40506 USA 2.Univ Oxford, Dept Phys, Subdept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England 3.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, 20 Datun Rd, Beijing 100020, Peoples R China 5.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 6.Univ Manchester, Ctr Astrophys, Jodrell Bank, Alan Turing Bldg, Manchester M13 9PL, Lancs, England |
| 推荐引用方式 GB/T 7714 | Ge, Junqiang,Yan, Renbin,Cappellari, Michele,et al. Recovering stellar population parameters via two full-spectrum fitting algorithms in the absence of model uncertainties[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,478(2):2633-2649. |
| APA | Ge, Junqiang,Yan, Renbin,Cappellari, Michele,Mao, Shude,Li, Hongyu,&Lu, Youjun.(2018).Recovering stellar population parameters via two full-spectrum fitting algorithms in the absence of model uncertainties.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,478(2),2633-2649. |
| MLA | Ge, Junqiang,et al."Recovering stellar population parameters via two full-spectrum fitting algorithms in the absence of model uncertainties".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478.2(2018):2633-2649. |
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来源：国家天文台
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