Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1
We present a study of Lyman continuum (LyC) emission in a sample of ∼150 Ly α emitters (LAEs) at z ≈ 3.1 in the Subaru-XMM Deep Survey field. These LAEs were previously selected using the narrowband technique and spectroscopically confirmed with Ly α equivalent widths (EWs) ≥ 45 Å. We obtain deep UV...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acf9fa |
| _version_ | 1797633836320817152 |
|---|---|
| author | Yuchen Liu Linhua Jiang Rogier A. Windhorst Yucheng Guo Zhen-Ya Zheng |
| author_facet | Yuchen Liu Linhua Jiang Rogier A. Windhorst Yucheng Guo Zhen-Ya Zheng |
| author_sort | Yuchen Liu |
| collection | DOAJ |
| description | We present a study of Lyman continuum (LyC) emission in a sample of ∼150 Ly α emitters (LAEs) at z ≈ 3.1 in the Subaru-XMM Deep Survey field. These LAEs were previously selected using the narrowband technique and spectroscopically confirmed with Ly α equivalent widths (EWs) ≥ 45 Å. We obtain deep UV images using a custom intermediate-band filter U _J that covers a wavelength range of 3330 ∼ 3650 Å, corresponding to 810 ∼ 890 Å in the rest frame. We detect five individual LyC galaxy candidates in the U _J band, and their escape fractions ( f _esc ) of LyC photons are roughly between 40% and 80%. This supports a previous finding that a small fraction of galaxies may have very high f _esc . We find that the f _esc values of the five LyC galaxies are not apparently correlated with other galaxy properties such as Ly α luminosity and EW, UV luminosity and slope, and star formation rate (SFR). This is partly due to the fact that these galaxies only represent a small fraction (∼3%) of our LAE sample. For the remaining LAEs that are not detected in U _J , we stack their U _J -band images and constrain their average f _esc . The upper limit of the average f _esc value is about 16%, consistent with the results in the literature. Compared with the non-LyC LAEs, the LyC LAEs tend to have higher Ly α luminosities, Ly α EWs, and SFRs, but their UV continuum slopes are similar to those of other galaxies. |
| first_indexed | 2024-03-11T12:00:12Z |
| format | Article |
| id | doaj.art-eab32744d4f54ecfb2f3d29bcac58d5b |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T12:00:12Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-eab32744d4f54ecfb2f3d29bcac58d5b2023-11-08T09:16:03ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195812210.3847/1538-4357/acf9faLyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1Yuchen Liu0https://orcid.org/0009-0008-6770-3583Linhua Jiang1https://orcid.org/0000-0003-4176-6486Rogier A. Windhorst2https://orcid.org/0000-0001-8156-6281Yucheng Guo3https://orcid.org/0000-0002-6137-0422Zhen-Ya Zheng4https://orcid.org/0000-0002-9634-2923Department of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaSchool of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287, USADepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China; Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon UMR5574 , F-69230, Saint-Genis-Laval, FranceKey Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, People's Republic of ChinaWe present a study of Lyman continuum (LyC) emission in a sample of ∼150 Ly α emitters (LAEs) at z ≈ 3.1 in the Subaru-XMM Deep Survey field. These LAEs were previously selected using the narrowband technique and spectroscopically confirmed with Ly α equivalent widths (EWs) ≥ 45 Å. We obtain deep UV images using a custom intermediate-band filter U _J that covers a wavelength range of 3330 ∼ 3650 Å, corresponding to 810 ∼ 890 Å in the rest frame. We detect five individual LyC galaxy candidates in the U _J band, and their escape fractions ( f _esc ) of LyC photons are roughly between 40% and 80%. This supports a previous finding that a small fraction of galaxies may have very high f _esc . We find that the f _esc values of the five LyC galaxies are not apparently correlated with other galaxy properties such as Ly α luminosity and EW, UV luminosity and slope, and star formation rate (SFR). This is partly due to the fact that these galaxies only represent a small fraction (∼3%) of our LAE sample. For the remaining LAEs that are not detected in U _J , we stack their U _J -band images and constrain their average f _esc . The upper limit of the average f _esc value is about 16%, consistent with the results in the literature. Compared with the non-LyC LAEs, the LyC LAEs tend to have higher Ly α luminosities, Ly α EWs, and SFRs, but their UV continuum slopes are similar to those of other galaxies.https://doi.org/10.3847/1538-4357/acf9faHigh-redshift galaxiesGalaxy propertiesStar formation |
| spellingShingle | Yuchen Liu Linhua Jiang Rogier A. Windhorst Yucheng Guo Zhen-Ya Zheng Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 The Astrophysical Journal High-redshift galaxies Galaxy properties Star formation |
| title | Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 |
| title_full | Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 |
| title_fullStr | Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 |
| title_full_unstemmed | Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 |
| title_short | Lyman Continuum Emission from Spectroscopically Confirmed Lyα Emitters at z ∼ 3.1 |
| title_sort | lyman continuum emission from spectroscopically confirmed lyα emitters at z ∼ 3 1 |
| topic | High-redshift galaxies Galaxy properties Star formation |
| url | https://doi.org/10.3847/1538-4357/acf9fa |
| work_keys_str_mv | AT yuchenliu lymancontinuumemissionfromspectroscopicallyconfirmedlyaemittersatz31 AT linhuajiang lymancontinuumemissionfromspectroscopicallyconfirmedlyaemittersatz31 AT rogierawindhorst lymancontinuumemissionfromspectroscopicallyconfirmedlyaemittersatz31 AT yuchengguo lymancontinuumemissionfromspectroscopicallyconfirmedlyaemittersatz31 AT zhenyazheng lymancontinuumemissionfromspectroscopicallyconfirmedlyaemittersatz31 |