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Individual stellar haloes of massive galaxies measured to 100 kpc at 0.3 < z < 0.5 using Hyper Suprime-Cam
Open accessAbstract
Massive galaxies display extended light profiles that can reach several hundreds of kilo parsecs. These stellar halos provide a fossil record of galaxy assembly histories. Using data that is both wide (~100 square degree) and deep (i>28.5 mag/arcsec^2 in i-band), we present a systematic study of the stellar halos of a sample of more than 3000 galaxies at 0.3 < z < 0.5 with $\log M_{\star}/M_{\odot} > 11.4$. Our study is based on high-quality (0.6 arcsec seeing) imaging data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP), which enables us to individually estimate surface mass density profiles to 100 kpc without stacking. As in previous work, we find that more massive galaxies exhibit more extended outer profiles. When this extended light is not properly accounted for as a result of shallow imaging or inadequate profile modeling, the derived stellar mass function can be significantly underestimated at the highest masses. Across our sample, the ellipticity of outer light profiles increases substantially as we probe larger radii. We show for the first time that these ellipticity gradients steepen dramatically as a function of galaxy mass, but we detect no mass-dependence in outer color gradients. Our results support the two-phase formation scenario for massive galaxies in which outer envelopes are built up at late times from a series of merging events. We provide surface mass surface mass density profiles in a convenient tabulated format to facilitate comparisons with predictions from numerical simulations of galaxy formation.
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“HSC-PDR2 has been widely tested for low surface brightness studies (e.g. Huang et al. 2018, 2020; Li et al. 2022; Martínez-Lombilla et al. 2023) and fulfils the requirements for our study.”
From Detecting galaxy tidal features using self-supervised representation learning (2024) · cites this paper as Huang et al. 2018
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SITCOMTN-165: Surface brightness profiles around massive galaxies in LSSTComCam data
Zhou, C., Jeltema, T., von der Linden, A., Kelvin, L. S., Dell’Antonio, I., Taranu, D. S., Englert, A., & Leauthaud, A. (2025) · DOE SLAC National Accelerator Laboratory Repository · doi:10.71929/rubin/3000576
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The Role of Cluster Environments in Quiescent Galaxy Stellar Halo Assembly
Williams, D. J., Damjanov, I., Sawicki, M., Souchereau, H. J., Chen, L., Desprez, G., George, A., Gwyn, S., & Arnouts, S. (2026) · The Astrophysical Journal · doi:10.3847/1538-4357/ae95fc
Metadata
- Authors
- Huang, S., Leauthaud, A., Greene, J. E., Bundy, K., Lin, Y.-T., Tanaka, M., Miyazaki, S., & Komiyama, Y.
- Affiliations
- Kavli Institute for the Physics and Mathematics of the Universe (JP)
- University of California, Santa Cruz (US)
- Institute of Astronomy and Astrophysics, Academia Sinica (TW)
- National Astronomical Observatory of Japan (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Corresponding author
- Huang, Song
- ORCID
- Venue
- Monthly Notices of the Royal Astronomical Society
- Publisher
- Oxford University Press (OUP)
- Published
- 2017-12-15
- Volume
- 475
- Issue
- 3
- Pages
- 3348-3368
- ISSN
- 0035-8711 (ISSN-L)
- 1365-2966
- OpenAlex
- W2730169491
- Cited by
- 113
- References
- 168
- Citations by year
- 2026: 3 · 2025: 11 · 2024: 9 · 2023: 10 · 2022: 23 · 2021: 21 · 2020: 11 · 2019: 13 · 2018: 9 · 2017: 3
- FWCI
- 5.39
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Monthly Notices of the Royal Astronomical Society (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (1714610, AST-1238877, PHY11-25915)
- National Aeronautics and Space Administration (NNX08AR22G)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Keywords
- stellar haloes, massive galaxies, color gradients, stellar mass function, galaxy assembly history, galaxy mergers, Hyper Suprime-Cam Subaru Strategic Program, intermediate-redshift galaxies
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