Inside-out growth and the kiloparsec-scale star formation main sequence for low-surface-brightness disk galaxies in MaNGA

@misc{zhang2026insideout,
  title = {{Inside-out growth and the kiloparsec-scale star formation main sequence for low-surface-brightness disk galaxies in MaNGA}},
  author = {Bing-qing Zhang and Ze-hao Zhong and Yi-nan Zhu and Hong Wu},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.02378},
  eprint = {2609.02378},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.02378},
}

TY  - UNPB
TI  - Inside-out growth and the kiloparsec-scale star formation main sequence for low-surface-brightness disk galaxies in MaNGA
AU  - Bing-qing Zhang
AU  - Ze-hao Zhong
AU  - Yi-nan Zhu
AU  - Hong Wu
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.02378
UR  - https://arxiv.org/abs/2609.02378
AB  - Low surface brightness galaxies (LSBGs) are very faint objects in the universe whose formation and evolution have long remained an unresolved problem. We selected a late-type, face-on, and disk-dominated galaxy sample from the MaNGA survey, composed of 38 LSBGs and 216 high surface brightness galaxies (HSBGs) by adopting a central surface brightness threshold μ_0(g) = 22.0 mag arcsec^−2. Based on maps derived from pipe3D products of star-forming areas in galaxies, we investigated the global and resolved star formation main sequence (SFMS and rSFMS) and radial profiles of the stellar mass density (Σ_*), star formation rate density (Σ_SFR), and specific star formation rate (Σ_sSFR). The radial profiles of Σ_* and Σ_SFR present negative gradients, while those of Σ_sSFR present positive gradients. Compared to HSBGs, the LSBGs show similar, flatter, and steeper slopes in Σ_*, Σ_SFR, and Σ_sSFR gradients, respectively. The very flat Σ_SFR gradients of LSBGs, whose slopes range from -0.1 to -0.2, indicates uniform star formation throughout the whole galaxy, and the positive Σ_sSFR gradients reflects their ``inside-out'' growth. Our LSBGs and HSBGs follow the same global and resolved SFMS as the full sample, and μ_0 shows no influence on both SFMS and rSFMS. For our full sample and two subsamples (HSBGs and LSBGs), the slopes of global SFMS and rSFMS are consistent, which indicates that the SFMS still hold on a kiloparsec scale and the star formation activities are regulated by local events. The treatment of different excitation sources in galaxies affects the slope of the SFMS and rSFMS, and using star-forming areas only is more advisable.
ER  -