Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙
To understand in what mass regime star-forming galaxies (SFGs) build up central mass concentration most actively, we present a study on the luminosity-weighted stellar age radial gradient (∇ _age ) distribution of ∼3600 low-redshift SFGs using the MaNGA Pipe3D data available in Data Release 17 from...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad0230 |
| _version_ | 1827766106674167808 |
|---|---|
| author | Zhizheng Pan Xianzhong Zheng Xu Kong |
| author_facet | Zhizheng Pan Xianzhong Zheng Xu Kong |
| author_sort | Zhizheng Pan |
| collection | DOAJ |
| description | To understand in what mass regime star-forming galaxies (SFGs) build up central mass concentration most actively, we present a study on the luminosity-weighted stellar age radial gradient (∇ _age ) distribution of ∼3600 low-redshift SFGs using the MaNGA Pipe3D data available in Data Release 17 from the Sloan Digital Sky Survey. The mean age gradient is negative, with ∇ _age = −0.14 log Gyr/ R _e , consistent with the inside-out disk formation scenario. Specifically, SFGs with positive ∇ _age consist of ∼28% at log ( M _* / M _⊙ ) < 9.5, while this fraction rises up to its peak (∼40%) near log ( M _* / M _⊙ ) = 10 and then decreases to ∼15% at log ( M _* / M _⊙ ) = 11. At fixed M _* , SFGs with positive ∇ _age typically have more compact sizes and more centrally concentrated star formation than their counterparts, indicative of recent central mass buildup events. These results suggest that the buildup of central stellar mass concentration in local SFGs is mostly active near M _* = 10 ^10 M _⊙ . Our findings provide new insights into the origin of morphological differences between low-mass and high-mass SFGs. |
| first_indexed | 2024-03-11T11:37:16Z |
| format | Article |
| id | doaj.art-12a8ce72beae4f60b36a9870bb42a2eb |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T11:37:16Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-12a8ce72beae4f60b36a9870bb42a2eb2023-11-10T12:47:02ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195814210.3847/1538-4357/ad0230Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙Zhizheng Pan0https://orcid.org/0000-0001-5662-8217Xianzhong Zheng1https://orcid.org/0000-0003-3728-9912Xu Kong2https://orcid.org/0000-0002-7660-2273Purple Mountain Observatory, Chinese Academy of Sciences , 10 Yuan Hua Road, Nanjing, Jiangsu 210033, People's Republic of China ; panzz@pmo.ac.cn; School of Astronomy and Space Sciences, University of Science and Technology of China , Hefei 230026, People's Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , 10 Yuan Hua Road, Nanjing, Jiangsu 210033, People's Republic of China ; panzz@pmo.ac.cn; School of Astronomy and Space Sciences, University of Science and Technology of China , Hefei 230026, People's Republic of ChinaSchool of Astronomy and Space Sciences, University of Science and Technology of China , Hefei 230026, People's Republic of China; CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of ChinaTo understand in what mass regime star-forming galaxies (SFGs) build up central mass concentration most actively, we present a study on the luminosity-weighted stellar age radial gradient (∇ _age ) distribution of ∼3600 low-redshift SFGs using the MaNGA Pipe3D data available in Data Release 17 from the Sloan Digital Sky Survey. The mean age gradient is negative, with ∇ _age = −0.14 log Gyr/ R _e , consistent with the inside-out disk formation scenario. Specifically, SFGs with positive ∇ _age consist of ∼28% at log ( M _* / M _⊙ ) < 9.5, while this fraction rises up to its peak (∼40%) near log ( M _* / M _⊙ ) = 10 and then decreases to ∼15% at log ( M _* / M _⊙ ) = 11. At fixed M _* , SFGs with positive ∇ _age typically have more compact sizes and more centrally concentrated star formation than their counterparts, indicative of recent central mass buildup events. These results suggest that the buildup of central stellar mass concentration in local SFGs is mostly active near M _* = 10 ^10 M _⊙ . Our findings provide new insights into the origin of morphological differences between low-mass and high-mass SFGs.https://doi.org/10.3847/1538-4357/ad0230Galaxy evolution |
| spellingShingle | Zhizheng Pan Xianzhong Zheng Xu Kong Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ The Astrophysical Journal Galaxy evolution |
| title | Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ |
| title_full | Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ |
| title_fullStr | Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ |
| title_full_unstemmed | Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ |
| title_short | Local Star-forming Galaxies Build Up Central Mass Concentration Most Actively near M ∗ = 1010 M ⊙ |
| title_sort | local star forming galaxies build up central mass concentration most actively near m ∗ 1010 m ⊙ |
| topic | Galaxy evolution |
| url | https://doi.org/10.3847/1538-4357/ad0230 |
| work_keys_str_mv | AT zhizhengpan localstarforminggalaxiesbuildupcentralmassconcentrationmostactivelynearm1010m AT xianzhongzheng localstarforminggalaxiesbuildupcentralmassconcentrationmostactivelynearm1010m AT xukong localstarforminggalaxiesbuildupcentralmassconcentrationmostactivelynearm1010m |