NAOC Open IR
Unravelling stellar populations in the Andromeda Galaxy
Gajda, Grzegorz1; Gerhard, Ortwin1; Blana, Matias1,5; Zhu, Ling2; Shen, Juntai3,4; Saglia, Roberto P.1,5; Bender, Ralf1,5
2021-03-23
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume647Pages:20
AbstractTo understand the history and formation mechanisms of galaxies, it is crucial to determine their current multidimensional structure. In this work, we focus on the properties that characterise stellar populations, such as metallicity and [alpha /Fe] enhancement. We devised a new technique to recover the distribution of these parameters using spatially resolved, line-of-sight averaged data. Our chemodynamical method is based on the made-to-measure framework and results in an N-body model for the abundance distribution. Following a test on a mock data set we found that the radial and azimuthal profiles were well-recovered, however, only the overall shape of the vertical profile matches the true profile. We applied our procedure to spatially resolved maps of mean [Z/H] and [alpha /Fe] for the Andromeda Galaxy, using an earlier barred dynamical model of M 31. We find that the metallicity is enhanced along the bar, with a possible maxima at the ansae. In the edge-on view, the [Z/H] distribution has an X shape due to the boxy/peanut bulge; the average vertical metallicity gradient is equal to -0.133 +/- 0.006 dex kpc(-1). We identify a metallicity-enhanced ring around the bar, which also has relatively lower [alpha /Fe]. The highest [alpha /Fe] is found in the centre, due to the classical bulge. Away from the centre, the alpha -overabundance in the bar region increases with height, which could be an indication of a thick disc. We argue that the galaxy assembly resulted in a sharp peak of metallicity in the central few hundred parsecs and a more gentle negative gradient in the remaining disc, but no [alpha /Fe] gradient. The formation of the bar leads to the re-arrangement of the [Z/H] distribution, causing a flat gradient along the bar. Subsequent star formation close to the bar ends may have produced the metallicity enhancements at the ansae and the [Z/H] enhanced lower-alpha ring.
Keywordgalaxies: individual: M 31 galaxies: abundances galaxies: stellar content galaxies: structure methods: numerical
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy
DOI10.1051/0004-6361/202038381
Language英语
Funding ProjectDeutsche Forschungsgemeinschaft[GZ GE 567/5-1] ; National Key R&D Program of China[2018YFA0404501] ; National Natural Science Foundation of China[Y945271001] ; National Natural Science Foundation of China[12025302] ; National Natural Science Foundation of China[11773052] ; National Natural Science Foundation of China[11761131016] ; "111" Project of the Ministry of Education of China[B20019] ; CONICYT fellowship Postdoctorado en el Extranjero[74190011] ; CONICYT fellowship Postdoctorado en el Extranjero[8772/2018] ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy[EXC-2094-390783311]
Funding OrganizationDeutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education of China ; "111" Project of the Ministry of Education of China ; CONICYT fellowship Postdoctorado en el Extranjero ; CONICYT fellowship Postdoctorado en el Extranjero ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy ; Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000632992700003
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78631
Collection中国科学院国家天文台
Corresponding AuthorGajda, Grzegorz
Affiliation1.Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany
2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
4.Shanghai Key Lab Particle Phys & Cosmol, Key Lab Particle Astrophys & Cosmol, MOE, Shanghai 200240, Peoples R China
5.Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany
Recommended Citation
GB/T 7714
Gajda, Grzegorz,Gerhard, Ortwin,Blana, Matias,et al. Unravelling stellar populations in the Andromeda Galaxy[J]. ASTRONOMY & ASTROPHYSICS,2021,647:20.
APA Gajda, Grzegorz.,Gerhard, Ortwin.,Blana, Matias.,Zhu, Ling.,Shen, Juntai.,...&Bender, Ralf.(2021).Unravelling stellar populations in the Andromeda Galaxy.ASTRONOMY & ASTROPHYSICS,647,20.
MLA Gajda, Grzegorz,et al."Unravelling stellar populations in the Andromeda Galaxy".ASTRONOMY & ASTROPHYSICS 647(2021):20.
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