UV and NIR size of the low-mass field galaxies: the UV compact galaxies
Cheng, Cheng1,2; Xu, Cong Kevin1,2; Xie, Lizhi3; Pan, Zhizheng4; Du, Wei1; Orellana-Gonzalez, Gustavo5,6; Shao, Xu1,2; Wu, Shumei1,2; Leiton, Roger5; Huang, Jia-Sheng1,2; Dai, Sophia Yu1,2; Assmann, Paulina5; Araneda, Nicole5
Corresponding AuthorCheng, Cheng(
AbstractContext. Most of the massive star-forming galaxies are found to have "inside-out" stellar mass growth modes, which means the inner parts of the galaxies mainly consist of the older stellar population, while the star forming in the outskirt of the galaxy is still ongoing. Aims. The high-resolution HST images from Hubble Deep UV Legacy Survey and Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey projects with the unprecedented depth in both F275W and F160W bands are the perfect data sets to study the forming and formed stellar distribution directly. Methods. We selected the low redshift (0.05< z(spec)< 0.3) galaxy sample from the GOODS-North field where the HST F275W and F160W images are available. Then we measured the half light radius in F275W and F160W bands, which are the indicators of the star formation and stellar mass. Results. By comparing the F275W and F160W half light radius, we find the massive galaxies are mainly follow the "inside-out" growth mode, which is consistent with the previous results. Moreover, the HST F275W and F160W images reveal that some of the low-mass galaxies (< 10(8) M-circle dot) have the "outside-in" growth mode: their images show a compact UV morphology, implying an ongoing star formation in the galaxy centre, while the stars in the outskirts of the galaxies are already formed. The two modes transit smoothly at stellar mass range about 10(8-9) M-circle dot with a large scatter. We also try to identify the possible neighbour massive galaxies from the SDSS data, which represent the massive galaxy sample. We find that all of the spec-z selected galaxies have no massive galaxy nearby. Thus the "outside-in" mode we find in the low-mass galaxies are not likely originated from the environment.
Keywordgalaxies: formation galaxies: dwarf Galaxy: center galaxies: structure ultraviolet: galaxies
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000508200600001
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Document Type期刊论文
Corresponding AuthorCheng, Cheng
Affiliation1.Chinese Acad Sci, South Amer Ctr Astron, Natl Astron Observ, Beijing 100101, Peoples R China
2.China Chile Joint Ctr Astron, Camino El Observ 1515, Santiago, Chile
3.Tianjin Normal Univ, Tianjin Astrophys Ctr, Tianjin 300387, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
5.Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile
6.Univ Valparaiso, Inst Fis & Astron, Avda Gran Bretana 1111, Valparaiso, Chile
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Cheng, Cheng,Xu, Cong Kevin,Xie, Lizhi,et al. UV and NIR size of the low-mass field galaxies: the UV compact galaxies[J]. ASTRONOMY & ASTROPHYSICS,2020,633:9.
APA Cheng, Cheng.,Xu, Cong Kevin.,Xie, Lizhi.,Pan, Zhizheng.,Du, Wei.,...&Araneda, Nicole.(2020).UV and NIR size of the low-mass field galaxies: the UV compact galaxies.ASTRONOMY & ASTROPHYSICS,633,9.
MLA Cheng, Cheng,et al."UV and NIR size of the low-mass field galaxies: the UV compact galaxies".ASTRONOMY & ASTROPHYSICS 633(2020):9.
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