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The First Systematic Survey of Stellar Halos in High-inclination Galaxies Reveals Unusually Quiescent Merger Histories of Nearby Galaxies

  • Authors: Bojun Tao, Hong-Xin Zhang, Wenting Wang, Enci Wang, Guangwen Chen, Huiyuan Wang, Lijun Chen, Qian-Hui Chen, Song Huang, Xu Kong, Yu Rong

Bojun Tao et al 2026 The Astrophysical Journal Supplement Series 284 .

  • Provider: AAS Journals

Caption: Figure 2.

HSC-SSP Deep/UltraDeep images of nine representative galaxies in our final sample of high-inclination central galaxies. For each galaxy, the g-, r-, and i-band tricolor image of the high surface brightness central region is combined with the white-light gray-scale image to reveal the lower surface brightness outskirts. Images are rebinned to enhance visibility of the low-surface-brightness outskirts. The first row shows galaxies with MW-like stellar masses, ﹩{\rm{log}}({M}_{\star }/{M}_{\odot })\sim (10.5,\,11.0)﹩. The second row displays galaxies with ﹩{\rm{log}}({M}_{\star }/{M}_{\odot })\sim (10.0,\,10.5)﹩. The last row represents galaxies with the lowest stellar masses, ﹩{\rm{log}}({M}_{\star }/{M}_{\odot })\lt 10.0﹩. The first column depicts galaxies with high stellar halo fractions, ﹩{\rm{log}}{f}_{{\rm{halo}}}\gt -1﹩. The middle column shows galaxies with moderate stellar halo fractions, ﹩{\rm{log}}{f}_{{\rm{halo}}}\sim (-2,\,-1)﹩. The last column shows galaxies without stellar halo detections. The color bar of the gray-scale image in the lower-left panel is in units of mag arcsec−2.

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