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A simple numerical experiment on the dust temperature bias for Lyman break galaxies at $z\gtrsim 5$ by Chen, Yung Ying; Hirashita, Hiroyuki; Wang, Wei-Hao; Nakai, Naomasa is a scholarly article available to read on EtoBox.

What is A simple numerical experiment on the dust temperature bias for Lyman break galaxies at $z\gtrsim 5$ about?

Some studies suggest that the dust temperatures ($T_\mathrm{d}$) in high-redshift ($z\gtrsim 5$) Lyman break galaxies (LBGs) are high. However, possible observational bias in $T_\mathrm{d}$ is yet to be understood. Thus, we perform a simple test using random realizations of LBGs with various stellar masses, dust temperatures, and dust-to-stellar mass ratios, and examine how the sample detected by ALMA is biased in terms of $T_\mathrm{d}$. We show that ALMA tends to miss high-$T_\mathrm{d}$ objects even at total dust luminosity. LBGs are, however, basically selected by the stellar UV luminosity. The dust-temperature bias in a UV-selected sample is complicated because of the competing effects between high $T_\mathrm{d}$ and low dust abundance. For ALMA Band 6, there is no tendency of high-$T_\mathrm{d}$ LBGs being more easily detected in our experiment. Thus, we suggest that the observed trend of high $T_\mathrm{d}$ in $z\gtrsim 5$ LBGs is real. We also propose that the 450 $\mu$m band is useful in further clarifying the dust temperatures. To overcome the current shallowness of 450 $\mu$m observations, we examine a future Antarctic 30-m class telescope with a suitable atmospheric con

Author

Chen, Yung Ying; Hirashita, Hiroyuki; Wang, Wei-Hao; Nakai, Naomasa

Published

2021

Language

EN