Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in Astronomical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-3881/ac20d6
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Towards precise galaxy evolution
T2 - a comparison between spectral indices of $z\sim1$ galaxies in the IllustrisTNG simulation and the LEGA-C survey
AU - Wu, Po-Feng
AU - Nelson, Dylan
AU - Wel, Arjen van der
AU - Pillepich, Annalisa
AU - Zibetti, Stefano
AU - Bezanson, Rachel
AU - D'Eugenio, Francesco
AU - Gallazzi, Anna
AU - Pacifici, Camilla
AU - Straatman, Caroline M. S.
AU - Barišić, Ivana
AU - Bell, Eric F.
AU - Maseda, Michael V.
AU - Muzzin, Adam
AU - Sobral, David
AU - Whitaker, Katherine E.
N1 - This is an author-created, un-copyedited version of an article accepted for publication/published in Astronomical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-3881/ac20d6
PY - 2021/10/18
Y1 - 2021/10/18
N2 - We present the first comparison of observed stellar continuum spectra of high-redshift galaxies and mock galaxy spectra generated from hydrodynamical simulations. The mock spectra are produced from the IllustrisTNG TNG100 simulation combined with stellar population models and take into account dust attenuation and realistic observational effects (aperture effects and noise). We compare the simulated $D_n4000$ and EW(H$\delta$) of galaxies with $10.5 \leq \log(M_\ast/M_\odot) \leq 11.5$ at $0.6 \leq z \leq 1.0$ to the observed distributions from the LEGA-C survey. TNG100 globally reproduces the observed distributions of spectral indices, implying that the age distribution of galaxies in TNG100 is generally realistic. Yet there are small but significant differences. For old galaxies, TNG100 shows small $D_n4000$ when compared to LEGA-C, while LEGA-C galaxies have larger EW(H$\delta$) at fixed $D_n4000$. There are several possible explanations: 1) LEGA-C galaxies have overall older ages combined with small contributions (a few percent in mass) from younger ($
AB - We present the first comparison of observed stellar continuum spectra of high-redshift galaxies and mock galaxy spectra generated from hydrodynamical simulations. The mock spectra are produced from the IllustrisTNG TNG100 simulation combined with stellar population models and take into account dust attenuation and realistic observational effects (aperture effects and noise). We compare the simulated $D_n4000$ and EW(H$\delta$) of galaxies with $10.5 \leq \log(M_\ast/M_\odot) \leq 11.5$ at $0.6 \leq z \leq 1.0$ to the observed distributions from the LEGA-C survey. TNG100 globally reproduces the observed distributions of spectral indices, implying that the age distribution of galaxies in TNG100 is generally realistic. Yet there are small but significant differences. For old galaxies, TNG100 shows small $D_n4000$ when compared to LEGA-C, while LEGA-C galaxies have larger EW(H$\delta$) at fixed $D_n4000$. There are several possible explanations: 1) LEGA-C galaxies have overall older ages combined with small contributions (a few percent in mass) from younger ($
KW - astro-ph.GA
U2 - 10.3847/1538-3881/ac20d6
DO - 10.3847/1538-3881/ac20d6
M3 - Journal article
VL - 162
JO - The Astronomical Journal
JF - The Astronomical Journal
SN - 0004-6256
IS - 5
M1 - 201
ER -