A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5
Abstract Some studies suggest that the dust temperatures (Td) in high-redshift (z ≳ 5) Lyman break galaxies (LBGs) are high. However, possible observational bias in Td is yet to be understood. Thus, we perform a simple test using random realizations of LBGs with various stellar masses, dust temperat...
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2021
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Online Access: | http://dx.doi.org/10.1093/mnras/stab3142 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3142/41071829/stab3142.pdf |
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croxfordunivpr:10.1093/mnras/stab3142 2024-06-09T07:40:14+00:00 A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 Chen, Yung Ying Hirashita, Hiroyuki Wang, Wei-Hao Nakai, Naomasa 2021 http://dx.doi.org/10.1093/mnras/stab3142 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3142/41071829/stab3142.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society ISSN 0035-8711 1365-2966 journal-article 2021 croxfordunivpr https://doi.org/10.1093/mnras/stab3142 2024-05-10T13:14:36Z Abstract Some studies suggest that the dust temperatures (Td) in high-redshift (z ≳ 5) Lyman break galaxies (LBGs) are high. However, possible observational bias in Td 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 Td. We show that ALMA tends to miss high-Td objects even at total dust luminosity LIR > 1011 L⊙. 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 Td and low dust abundance. For ALMA Band 6, there is no tendency of high-Td LBGs being more easily detected in our experiment. Thus, we suggest that the observed trend of high Td in z ≳ 5 LBGs is real. We also propose that the 450 $\rm {\mu m}$ band is useful in further clarifying the dust temperatures. To overcome the current shallowness of 450 $\rm {\mu m}$ observations, we examine a future Antarctic 30-m class telescope with a suitable atmospheric condition for wavelengths $\lesssim 450~\rm {\mu m}$, where the detection is not confusion-limited. We find that, with this telescope, an LIR-selected sample with log (LIR/L⊙) > 11 is constructed for z ≳ 5, and detection in the intermediate-M⋆ (stellar mass) range [9 < log (M⋆/M⊙) < 9.5] is much improved, especially at high Td. Article in Journal/Newspaper Antarc* Antarctic Oxford University Press Antarctic Monthly Notices of the Royal Astronomical Society |
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English |
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Abstract Some studies suggest that the dust temperatures (Td) in high-redshift (z ≳ 5) Lyman break galaxies (LBGs) are high. However, possible observational bias in Td 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 Td. We show that ALMA tends to miss high-Td objects even at total dust luminosity LIR > 1011 L⊙. 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 Td and low dust abundance. For ALMA Band 6, there is no tendency of high-Td LBGs being more easily detected in our experiment. Thus, we suggest that the observed trend of high Td in z ≳ 5 LBGs is real. We also propose that the 450 $\rm {\mu m}$ band is useful in further clarifying the dust temperatures. To overcome the current shallowness of 450 $\rm {\mu m}$ observations, we examine a future Antarctic 30-m class telescope with a suitable atmospheric condition for wavelengths $\lesssim 450~\rm {\mu m}$, where the detection is not confusion-limited. We find that, with this telescope, an LIR-selected sample with log (LIR/L⊙) > 11 is constructed for z ≳ 5, and detection in the intermediate-M⋆ (stellar mass) range [9 < log (M⋆/M⊙) < 9.5] is much improved, especially at high Td. |
format |
Article in Journal/Newspaper |
author |
Chen, Yung Ying Hirashita, Hiroyuki Wang, Wei-Hao Nakai, Naomasa |
spellingShingle |
Chen, Yung Ying Hirashita, Hiroyuki Wang, Wei-Hao Nakai, Naomasa A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
author_facet |
Chen, Yung Ying Hirashita, Hiroyuki Wang, Wei-Hao Nakai, Naomasa |
author_sort |
Chen, Yung Ying |
title |
A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
title_short |
A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
title_full |
A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
title_fullStr |
A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
title_full_unstemmed |
A simple numerical experiment on the dust temperature bias for Lyman break galaxies at z ≳ 5 |
title_sort |
simple numerical experiment on the dust temperature bias for lyman break galaxies at z ≳ 5 |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/mnras/stab3142 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3142/41071829/stab3142.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Monthly Notices of the Royal Astronomical Society ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/mnras/stab3142 |
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Monthly Notices of the Royal Astronomical Society |
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1801383686293159936 |