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Peer-reviewedCC BY 4.0The Astrophysical Journal

Quantifying Environmental Effects on Galaxy Properties Using Nonspherical Voids Identified from SDSS DR7

  • Yingxiao Song1
  • Xiaohu Yang1
  • Yan Gong2,3
  • Haitao Miao2
  • Xingchen Zhou2
  • Yizhou Gu1
  • Yingjie Peng4
4 affiliations
  1. 1Shanghai Jiao Tong University
  2. 2Chinese Academy of Sciences
  3. 3University of Chinese Academy of Sciences(UCAS
  4. 4Peking University
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Abstract

Cosmic voids provide a distinct low-density region for studying the environmental effects of galaxy properties. Using the SDSS DR7 catalog, we identify nonspherical voids via Voronoi tessellation and the watershed algorithm and classify void galaxies based on their local volume. We compare and find that void galaxies classified by this method are systematically less massive, fainter, bluer, and have higher specific star formation rate (sSFR) than nonvoid galaxies and all galaxy samples. We then divide void and nonvoid galaxies into stellar mass bins to focus on the environmental dependence of g − r color and sSFR. By further classifying galaxies into blue/red and star-forming/quiescent populations, we calculate the ratio of blue to red and star-forming to quiescent for void and nonvoid galaxies separately. Comparing the ratio of the void value to the nonvoid value for both metrics presents an overall decreasing trend with stellar mass M * over the 9.4–10.4 range in log [ M * / M ⊙ ] , indicating a stronger environmental effect in lower-mass systems. These results show that our classification of void galaxies in nonspherical voids based on local volume offers a robust approach for quantifying the influence of underdense environments on galaxy evolution.

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Cite

BibTeXRIS
BibTeX
@article{song2026quantifying,
  title = {{Quantifying Environmental Effects on Galaxy Properties Using Nonspherical Voids Identified from SDSS DR7}},
  author = {Yingxiao Song and Xiaohu Yang and Yan Gong and Haitao Miao and Xingchen Zhou and Yizhou Gu and Yingjie Peng},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea8fb},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea8fb},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Quantifying Environmental Effects on Galaxy Properties Using Nonspherical Voids Identified from SDSS DR7
AU  - Yingxiao Song
AU  - Xiaohu Yang
AU  - Yan Gong
AU  - Haitao Miao
AU  - Xingchen Zhou
AU  - Yizhou Gu
AU  - Yingjie Peng
PY  - 2026
DA  - 2026/10/21
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea8fb
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea8fb
AB  - Cosmic voids provide a distinct low-density region for studying the environmental effects of galaxy properties. Using the SDSS DR7 catalog, we identify nonspherical voids via Voronoi tessellation and the watershed algorithm and classify void galaxies based on their local volume. We compare and find that void galaxies classified by this method are systematically less massive, fainter, bluer, and have higher specific star formation rate (sSFR) than nonvoid galaxies and all galaxy samples. We then divide void and nonvoid galaxies into stellar mass bins to focus on the environmental dependence of g − r color and sSFR. By further classifying galaxies into blue/red and star-forming/quiescent populations, we calculate the ratio of blue to red and star-forming to quiescent for void and nonvoid galaxies separately. Comparing the ratio of the void value to the nonvoid value for both metrics presents an overall decreasing trend with stellar mass M * over the 9.4–10.4 range in log [ M * / M ⊙ ] , indicating a stronger environmental effect in lower-mass systems. These results show that our classification of void galaxies in nonspherical voids based on local volume offers a robust approach for quantifying the influence of underdense environments on galaxy evolution.
SN  - 0004-637X
SN  - 1538-4357
ER  -