3D distribution map of Hi gas and galaxies around an enormous Lyα nebula and three QSOs at z = 2.3 revealed by the Hi tomographic mapping technique

Shiro Mukae, Masami Ouchi, Zheng Cai, Khee Gan Lee, J. Xavier Prochaska, Sebastiano Cantalupo, Yoshiaki Ono, Zheng Zheng, Kentaro Nagamine, Nao Suzuki, John D. Silverman, Toru Misawa, Akio K. Inoue, Joseph F. Hennawi, Yuichi Matsuda, Ken Mawatari, Yuma Sugahara, Takashi Kojima, Takatoshi Shibuya, Yuichi HarikaneSeiji Fujimoto, Yi Kuan Chiang, Haibin Zhang, Ryota Kakuma

Research output: Contribution to journalArticlepeer-review

Abstract

We present an IGM Hi tomographic map in a survey volume of 16 × 19 × 131 h3comoving Mpc3 (cMpc3) centered at MAMMOTH-1 nebula and three neighbouring quasars at z = 2.3. MAMMOTH-1 nebula is an enormous Lyα nebula (ELAN), hosted by a type-II quasar dubbed MAMMOTH1-QSO, that extends over 1 h1 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 tomographic map with a spatial resolution of 2.6 h1 cMpc. Our Hi tomographic map is reconstructed with Hi Lyα 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 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.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2019 Oct 7

Keywords

  • Galaxies: formation
  • Intergalactic medium
  • Large-scale structure of universe

ASJC Scopus subject areas

  • General

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