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- W2977887813 abstract "Author(s): Hahn, ChangHoon; Tinker, Jeremy L; Wetzel, Andrew | Abstract: We present constraints on the timescale of star formation variability and the correlation between star formation and host halo accretion histories of (SF) central galaxies from the scatter of the stellar-to-halo mass relation (SHMR). SF galaxies are found to have a tight relationship between their star formation rates and stellar masses on the so-called star-forming sequence (SFS), which characterizes their SF histories and $M_*$ growths. Meanwhile, observed SHMR constraints connect $M_*$ growth to halo accretion history. Combining these observed trends with a cosmological $N$-body simulation, we present flexible models that track the SF, $M_*$, and halo accretion histories of SF central galaxies at $zl1$ while reproducing the observed stellar mass function and SFS in SDSS DR7. We find that the scatter in SHMR at $M_h=10^{12}M_odot$, $sigma_{M_*|M_h=10^{12}M_odot}$, is sensitive to the timescale of star formation variability, $t_{rm duty}$, and the correlation coefficient, $r$, between SF and halo accretion histories: shorter $t_{rm duty}$ and higher $r$ both result in tighter $sigma_{M_*|M_h=10^{12}M_odot}$. To reproduce a constant 0.2 dex scatter over $z=1-0$, our models require $t_{rm duty}leq1.5$ Gyr for $r=0.99$ or $rg0.6$ for $t_{rm duty}=0.1$ Gyr. For $rsim0.6$, as found in the literature, $t_{rm duty}l0.2$ Gyr is necessary. Meanwhile, to reproduce the tightening of $sigma_{M_*|M_h=10^{12}M_odot}=0.35$ to 0.2 dex from $z=1-0$ in hydrodynamical simulations, our models require $t_{rm duty}=0.1$ Gyr for $rg0.5$. Although, the lack of consensus on $sigma_{M_*|M_h=10^{12}M_odot}$ at $M_h=10^{12}M_odot$ and at $z=1$ from observations and galaxy formation models remains the main bottleneck in precisely constraining $r$ and $t_{rm duty}$, we demonstrate that SHMR can be used to constrain the SF and host halo accretion histories of SF central galaxies." @default.
- W2977887813 created "2019-10-10" @default.
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- W2977887813 date "2019-10-03" @default.
- W2977887813 modified "2023-09-27" @default.
- W2977887813 title "Constraining Star Formation Histories of Blue Galaxies using the Scatter between Stellar Mass and Halo Mass" @default.
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