ODIN: Clustering Properties of Ly$α$ Blobs at $z$ $\sim$ 2.4 and 3.1
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866918524411183104 |
|---|---|
| author | Moon, Byeongha Yang, Yujin Gawiser, Eric Lee, Kyoung-Soo Herrera, Danisbel Ramakrishnan, Vandana Padilla, Nelson Firestone, Nicole M. Kim, Seongjae Ciardullo, Robin Gronwall, Caryl Guaita, Lucia Hwang, Ho Seong Im, Sang Hyeok Jeong, Woong-Seob Kumar, Ankit Lee, Jaehyun Lee, Seong-Kook Nantais, Julie B. Park, Changbom Song, Hyunmi |
| author_facet | Moon, Byeongha Yang, Yujin Gawiser, Eric Lee, Kyoung-Soo Herrera, Danisbel Ramakrishnan, Vandana Padilla, Nelson Firestone, Nicole M. Kim, Seongjae Ciardullo, Robin Gronwall, Caryl Guaita, Lucia Hwang, Ho Seong Im, Sang Hyeok Jeong, Woong-Seob Kumar, Ankit Lee, Jaehyun Lee, Seong-Kook Nantais, Julie B. Park, Changbom Song, Hyunmi |
| contents | Spatially extended Ly$α$ nebulae, known as Ly$α$ blobs (LABs), are a rare population at $z > 2$ that are thought to trace proto-groups or the progenitors of massive galaxies in the present-day universe. However, their dark matter halo properties (e.g., halo mass) are still uncertain due to their rarity and strong field-to-field variation. The One-hundred-deg$^2$ DECam Imaging in Narrowbands (ODIN) survey has discovered 103 and 112 LABs in the extended ($\sim$9~\sqdeg) COSMOS field at $z\sim2.4$ and 3.1, respectively, enabling estimation of their bias and host halo masses through clustering analysis. We measure the angular auto-correlation functions (ACFs) of LABs and derive galaxy bias factors of $b$ = $4.0\pm0.8$ and $3.8\pm0.7$, corresponding to minimum halo masses of $2.8^{+3.0}_{-1.8}$ and $0.7^{+0.8}_{-0.5}\times10^{12}~M_\odot$ and median halo masses of $4.2^{+3.8}_{-2.5}$ and $1.1^{+1.1}_{-0.7}\times10^{12}~M_\odot$ at $z\sim2.4$ and 3.1, respectively. LABs occupy $\sim$11$^{+39}_{-8}$\% and $\sim$3$^{+9}_{-2}$\% of all dark matter halos above these minimum halo masses. These findings suggest that LABs inhabit massive dark matter halos, likely tracing proto-group environments that evolve into present-day massive halos ($\sim$10$^{13}~M_\odot$), where massive elliptical galaxies or galaxy groups reside, by $z=0$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_01991 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | ODIN: Clustering Properties of Ly$α$ Blobs at $z$ $\sim$ 2.4 and 3.1 Moon, Byeongha Yang, Yujin Gawiser, Eric Lee, Kyoung-Soo Herrera, Danisbel Ramakrishnan, Vandana Padilla, Nelson Firestone, Nicole M. Kim, Seongjae Ciardullo, Robin Gronwall, Caryl Guaita, Lucia Hwang, Ho Seong Im, Sang Hyeok Jeong, Woong-Seob Kumar, Ankit Lee, Jaehyun Lee, Seong-Kook Nantais, Julie B. Park, Changbom Song, Hyunmi Astrophysics of Galaxies Spatially extended Ly$α$ nebulae, known as Ly$α$ blobs (LABs), are a rare population at $z > 2$ that are thought to trace proto-groups or the progenitors of massive galaxies in the present-day universe. However, their dark matter halo properties (e.g., halo mass) are still uncertain due to their rarity and strong field-to-field variation. The One-hundred-deg$^2$ DECam Imaging in Narrowbands (ODIN) survey has discovered 103 and 112 LABs in the extended ($\sim$9~\sqdeg) COSMOS field at $z\sim2.4$ and 3.1, respectively, enabling estimation of their bias and host halo masses through clustering analysis. We measure the angular auto-correlation functions (ACFs) of LABs and derive galaxy bias factors of $b$ = $4.0\pm0.8$ and $3.8\pm0.7$, corresponding to minimum halo masses of $2.8^{+3.0}_{-1.8}$ and $0.7^{+0.8}_{-0.5}\times10^{12}~M_\odot$ and median halo masses of $4.2^{+3.8}_{-2.5}$ and $1.1^{+1.1}_{-0.7}\times10^{12}~M_\odot$ at $z\sim2.4$ and 3.1, respectively. LABs occupy $\sim$11$^{+39}_{-8}$\% and $\sim$3$^{+9}_{-2}$\% of all dark matter halos above these minimum halo masses. These findings suggest that LABs inhabit massive dark matter halos, likely tracing proto-group environments that evolve into present-day massive halos ($\sim$10$^{13}~M_\odot$), where massive elliptical galaxies or galaxy groups reside, by $z=0$. |
| title | ODIN: Clustering Properties of Ly$α$ Blobs at $z$ $\sim$ 2.4 and 3.1 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.01991 |