Bibliographic Details
| Title: |
3D Distribution Map of HI Gas and Galaxies Around an Enormous Ly$\alpha$ Nebula and Three QSOs at $z=2.3$ Revealed by the HI Tomographic Mapping Technique |
| Authors: |
Mukae, Shiro, Ouchi, Masami, Cai, Zheng, Lee, Khee-Gan, Prochaska, J. Xavier, Cantalupo, Sebastiano, Zheng, Zheng, Nagamine, Kentaro, Suzuki, Nao, Silverman, John D., Misawa, Toru, Inoue, Akio K., Hennawi, Joseph F., Matsuda, Yuichi, Mawatari, Ken, Sugahara, Yuma, Kojima, Takashi, Ono, Yoshiaki, Shibuya, Takatoshi, Harikane, Yuichi, Fujimoto, Seiji, Chiang, Yi-Kuan, Zhang, Haibin, Kakuma, Ryota |
| Publication Year: |
2019 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Astrophysics of Galaxies |
| More Details: |
We present an IGM HI tomography map in a survey volume of $16 \times 19 \times 131 \ h^{-3} {\rm comoving \ Mpc}^{3}$ (cMpc$^3$) centered at MAMMOTH-1 nebula and three neighbouring quasars at $z=2.3$. MAMMOTH-1 nebula is an enormous Ly$\alpha$ nebula (ELAN), hosted by a type-II quasar dubbed MAMMOTH1-QSO, that extends over $1\ h^{-1}$ cMpc with not fully clear physical origin. Here we investigate the HI-gas distribution around MAMMOTH1-QSO with the ELAN and three neighbouring type-I quasars, making the IGM HI tomography map with a spatial resolution of $2.6\ h^{-1}$ cMpc. Our HI tomography map is reconstructed with HI Ly$\alpha$ forest absorption of bright background objects at $z=2.4-2.9$: one eBOSS quasar and 16 Keck/LRIS galaxy spectra. We estimate the radial profile of HI flux overdensity for MAMMOTH1-QSO, and find that MAMMOTH1-QSO resides in a volume with significantly weak HI absorption. This suggests that MAMMOTH1-QSO has a proximity zone where quasar illuminates and photo-ionizes the surrounding HI gas and suppresses HI absorption, and that the ELAN is probably a photo-ionized cloud embedded in the cosmic web. The HI radial profile of MAMMOTH1-QSO is very similar to those of three neighbouring type-I quasars at $z=2.3$, which is compatible with the AGN unification model. We compare the distributions of the HI absorption and star-forming galaxies in our survey volume, and identify a spatial offset between density peaks of star-forming galaxies and HI gas. This segregation may suggest anisotropic UV background radiation created by star-forming galaxy density fluctuations.
Comment: 15 pages, 9 figures. Accepted for Publication in ApJ |
| Document Type: |
Working Paper |
| DOI: |
10.3847/1538-4357/ab8db7 |
| Access URL: |
http://arxiv.org/abs/1910.02962 |
| Accession Number: |
edsarx.1910.02962 |
| Database: |
arXiv |
