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Environmental Dependence of Galactic Properties Traced by Ly$\alpha$ Forest Absorption: Diversity among Galaxy Populations by Momose, Rieko; Shimasaku, Kazuhiro; Kashikawa, Nobunari; Nagamine, Kentaro; Shimizu, Ikkoh; Nakajima, Kimihiko; Terao, Yasunori; Kusakabe, Haruka; Ando, Makoto; Motohara, Kentaro; Spitler, Lee is a scholarly article available to read on EtoBox.

What is Environmental Dependence of Galactic Properties Traced by Ly$\alpha$ Forest Absorption: Diversity among Galaxy Populations about?

In order to shed light on how galactic properties depend on the intergalactic medium (IGM) environment traced by the Ly$\alpha$ forest, we observationally investigate the IGM-galaxy connection using the publicly available 3D IGM tomography data (CLAMATO) and several galaxy catalogs in the COSMOS field. We measure the cross-correlation function (CCF) for $570$ galaxies with spec-$z$ measurements and detect a correlation with the IGM up to $50$ $h^{-1}$ comoving Mpc. We show that galaxies with stellar masses of $10^9-10^{10}$ M$_\odot$ are the dominant contributor to the total CCF signal. We also investigate CCFs for several galaxy populations: Ly$\alpha$ emitters (LAEs), H$\alpha$ emitters (HAEs), [OIII] emitters (O3Es), active galactic nuclei (AGNs), and submillimeter galaxies (SMGs), and we detect the highest signal in AGNs and SMGs at large scales ($r\geq5$ $h^{-1}$ Mpc), but in LAEs at small scales ($r<5$ $h^{-1}$ Mpc). We find that they live in various IGM environments -- HAEs trace the IGM in a similar manner to the continuum-selected galaxies, but LAEs and O3Es tend to reside in higher-density regions. Additionally, LAEs' CCF is flat up to $r\sim3$ $h^{-1}$ Mpc, indicating th

Author

Momose, Rieko; Shimasaku, Kazuhiro; Kashikawa, Nobunari; Nagamine, Kentaro; Shimizu, Ikkoh; Nakajima, Kimihiko; Terao, Yasunori; Kusakabe, Haruka; Ando, Makoto; Motohara, Kentaro; Spitler, Lee

Published

2020

Language

EN