PMO OpenIR  > 暗物质和空间天文实验室
GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101
Lin, Lin1,2; Zou, Hu3,4; Kong, Xu1,2; Lin, Xuanbin1,2; Mao, Yewei1,2,5; Cheng, Fuzhen1,2; Jiang, Zhaoji3,4; Zhou, Xu3,4
2013-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume769Issue:2Pages:1-37
Corresponding AuthorLin, L (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China. Email: linlin@mail.ustc.edu.cn ; zouhu@nao.cas.cn ; xkong@ustc.edu.cn
AbstractMultiband photometric images from ultraviolet and optical to infrared are collected to derive spatially resolved properties of the nearby Scd-type galaxy M101. With evolutionary stellar population synthesis models, two-dimensional distributions and radial profiles of age, metallicity, dust attenuation, and star formation timescale in the form of the Sandage star formation history are obtained. When fitting with the models, we use the IRX-A(FUV) relation, found to depend on a second parameter of birth rate b (ratio of present-and past-averaged star formation rates), to constrain the dust attenuation. There are obvious parameter gradients in the disk of M101, which supports the theory of an "inside-out" disk growth scenario. Two distinct disk regions with different gradients of age and color are discovered, similar to another late-type galaxy, NGC 628. The metallicity gradient of the stellar content is flatter than that of HII regions. The stellar disk is optically thicker inside than outside and the global dust attenuation of this galaxy is lower compared with galaxies of similar and earlier morphological type. We note that a variational star formation timescale describes the real star formation history of a galaxy. The timescale increases steadily from the center to the outskirt. We also confirm that the bulge in this galaxy is a disk-like pseudobulge, whose evolution is likely to be induced by some secular processes of the small bar which is relatively young, metal-rich, and contains much dust.
KeywordGalaxies: Bulges Galaxies: Evolution Galaxies: Individual (M101) Galaxies: Photometry
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/769/2/127
WOS KeywordH-II-REGIONS ; STAR-FORMATION RATES ; SPECTRAL ENERGY-DISTRIBUTIONS ; INITIAL MASS FUNCTION ; SPIRAL GALAXIES ; DUST ATTENUATION ; DISK GALAXIES ; STARBURST GALAXIES ; INFRARED-EMISSION ; FORMATION HISTORY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000319999100043
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9776
Collection暗物质和空间天文实验室
Affiliation1.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Lin, Lin,Zou, Hu,Kong, Xu,et al. GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101[J]. ASTROPHYSICAL JOURNAL,2013,769(2):1-37.
APA Lin, Lin.,Zou, Hu.,Kong, Xu.,Lin, Xuanbin.,Mao, Yewei.,...&Zhou, Xu.(2013).GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101.ASTROPHYSICAL JOURNAL,769(2),1-37.
MLA Lin, Lin,et al."GRADIENTS OF STELLAR POPULATION PROPERTIES AND EVOLUTION CLUES IN A NEARBY GALAXY M101".ASTROPHYSICAL JOURNAL 769.2(2013):1-37.
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