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PreprintCC BY 4.0arXiv

Low-Metallicity Star Formation Survey in Sh2-284 (LZ-STAR): The Core Mass Function

  • Yu Cheng
  • Jonathan C. Tan
  • Morten Andersen
  • Alva Kinman
  • Rubén Fedriani
  • Kei E. I. Tanaka
  • Yichen Zhang
Open at sourcePDFDOICite

Abstract

We present an ALMA 1.3~mm dust continuum study of the dense core mass function (CMF) in Sh2-284, a low metallicity outer Galaxy star-forming complex with Z∼1/3--1/2 Z⊙. The observations cover six far-infrared bright subregions at ∼0.65" (3000~au) resolution. We identify a total of 91 candidate dense cores and define a robust catalog of 68 cores with Gaussian fitting. The high-mass CMF above 2.5 Msun is well described by a Salpeter-like slope, with a fiducial forward-modeled value of α=1.22+0.24−0.22 for dN/dlog M∝ M−α. Together with existing constraints on the initial mass function (IMF) of Sh2-284, the Salpeter-like CMF is consistent with a resemblance between the CMF and IMF shapes in the outer Galaxy environments, suggesting that moderately low metallicity alone does not strongly reshape the high-mass CMF/IMF slope.

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Cite

BibTeXRIS
BibTeX
@misc{cheng2026lowmetallicity,
  title = {{Low-Metallicity Star Formation Survey in Sh2-284 (LZ-STAR): The Core Mass Function}},
  author = {Yu Cheng and Jonathan C. Tan and Morten Andersen and Alva Kinman and Rubén Fedriani and Kei E. I. Tanaka and Yichen Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.25753},
  eprint = {2607.25753},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.25753},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Low-Metallicity Star Formation Survey in Sh2-284 (LZ-STAR): The Core Mass Function
AU  - Yu Cheng
AU  - Jonathan C. Tan
AU  - Morten Andersen
AU  - Alva Kinman
AU  - Rubén Fedriani
AU  - Kei E. I. Tanaka
AU  - Yichen Zhang
PY  - 2026
DA  - 2026/09/22
PB  - arXiv
DO  - 10.48550/arxiv.2607.25753
UR  - https://arxiv.org/abs/2607.25753
AB  - We present an ALMA 1.3~mm dust continuum study of the dense core mass function (CMF) in Sh2-284, a low metallicity outer Galaxy star-forming complex with Z∼1/3--1/2 Z_⊙. The observations cover six far-infrared bright subregions at ∼0.65" (3000~au) resolution. We identify a total of 91 candidate dense cores and define a robust catalog of 68 cores with Gaussian fitting. The high-mass CMF above 2.5 Msun is well described by a Salpeter-like slope, with a fiducial forward-modeled value of α=1.22^+0.24_−0.22 for dN/dlog M∝ M^−α. Together with existing constraints on the initial mass function (IMF) of Sh2-284, the Salpeter-like CMF is consistent with a resemblance between the CMF and IMF shapes in the outer Galaxy environments, suggesting that moderately low metallicity alone does not strongly reshape the high-mass CMF/IMF slope.
ER  -