TY - JOUR
T1 - Environmental dependence of galactic properties traced by Lyα forest absorption
T2 - Diversity among galaxy populations
AU - Momose, Rieko
AU - Shimasaku, Kazuhiro
AU - Kashikawa, Nobunari
AU - Nagamine, Kentaro
AU - Shimizu, Ikkoh
AU - Nakajima, Kimihiko
AU - Terao, Yasunori
AU - Kusakabe, Haruka
AU - Ando, Makoto
AU - Motohara, Kentaro
AU - Spitler, Lee
N1 - Copyright © 2021 The American Astronomical Society. First published in the Astrophysical Journal, 909(2), 117, 2021, published by IOP Publishing. The original publication is available at https://doi.org/10.3847/1538-4357/abd2af. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2021/3/10
Y1 - 2021/3/10
N2 - In order to shed light on how galactic properties depend on the intergalactic medium (IGM) environment traced by the Lyα 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 109-1010 M⊙ are the dominant contributor to the total CCF signal. We also investigate CCFs for several galaxy populations: Lyα emitters (LAEs), Hα emitters (HAEs), [O iii] emitters (O3Es), active galactic nuclei (AGNs), and submillimeter galaxies (SMGs), and we detect the highest signal in AGNs and SMGs at large scales (r ≥ 5h-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 ∼ 3 h-1 Mpc, indicating that they tend to avoid the highest-density regions. For AGNs and SMGs, the CCF peak at r = 5-6 h-1 Mpc implies that they tend to be in locally lower-density regions. We suspect that it is due to the photoionization of IGM H i by AGNs, i.e., the proximity effect.
AB - In order to shed light on how galactic properties depend on the intergalactic medium (IGM) environment traced by the Lyα 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 109-1010 M⊙ are the dominant contributor to the total CCF signal. We also investigate CCFs for several galaxy populations: Lyα emitters (LAEs), Hα emitters (HAEs), [O iii] emitters (O3Es), active galactic nuclei (AGNs), and submillimeter galaxies (SMGs), and we detect the highest signal in AGNs and SMGs at large scales (r ≥ 5h-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 ∼ 3 h-1 Mpc, indicating that they tend to avoid the highest-density regions. For AGNs and SMGs, the CCF peak at r = 5-6 h-1 Mpc implies that they tend to be in locally lower-density regions. We suspect that it is due to the photoionization of IGM H i by AGNs, i.e., the proximity effect.
UR - http://www.scopus.com/inward/record.url?scp=85103242027&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/abd2af
DO - 10.3847/1538-4357/abd2af
M3 - Article
AN - SCOPUS:85103242027
SN - 0004-637X
VL - 909
SP - 1
EP - 21
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 117
ER -