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The stellar halo of isolated central galaxies in the Hyper Suprime-Cam imaging survey | | Wenting Wang
; Jiaxin Han
; Alessandro Sonnenfeld
; Naoki Yasuda
; Xiangchong Li
; Yipeng Jing
; Surhud More
; Paul A. Price
; Robert Lupton
; David V. Stark
; Ting-Wen Lan
; Masahiro Takada
; Song Huang
; Wentao Luo
; Neta A. Bahcall
; Yutaka Komiyama
; | | Date: |
12 Nov 2018 | | Abstract: | We study the faint stellar halo of isolated central galaxies, by stacking
galaxy images in the HSC survey and accounting for the residual sky background
sampled with random points. The surface brightness profiles in HSC $r$-band are
measured up to 120 kpc from the galaxy center for a wide range of galaxy
stellar mass ($9.2<log_{10}M_ast/M_odot<11.4$), and down to a surface
brightness of about 32.8 $mathrm{mag}/mathrm{arcsec}^2$, with an indication
of signals to even larger scales and fainter magnitudes. Failing to account for
the outer stellar halo below the noise level of individual images will lead to
underestimates of the total luminosity by $leq 20\%$. Splitting galaxies
according to the concentration parameter of their light distributions, we find
that the surface brightness profiles of low concentration galaxies drop faster
between 20 kpc and 100 kpc and are more extended beyond 100 kpc than those of
high concentration galaxies. The profiles of low concentration galaxies persist
out to the average halo virial radius. Albeit the large galaxy-to-galaxy
scatter, we find a strong self-similarity of the stellar halo profiles. They
show unified forms once the projected distance is scaled by the halo virial
radius. The colour of the stellar halo is redder in the center and bluer
outside, with high concentration galaxies having redder and flatter colour
profiles. Such a colour gradient persists to about 80 kpc for galaxies more
massive than $10^{10.2}M_odot$, whereas for galaxies with
$9.2<log_{10}M_ast/M_odot<10.2$, the gradient is consistent with being flat
between 10 kpc and 30 kpc. | | Source: | arXiv, 1811.4714 | | Services: | Forum | Review | PDF | Favorites | |
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