Environmental Dependence of Galactic Properties Traced by Ly alpha Forest Absorption: Diversity among Galaxy Populations
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Environmental Dependence of Galactic Properties Traced by Ly alpha Forest Absorption : Diversity among Galaxy Populations. / Momose, Rieko; Shimasaku, Kazuhiro; Kashikawa, Nobunari; Nagamine, Kentaro; Shimizu, Ikkoh; Nakajima, Kimihiko; Terao, Yasunori; Kusakabe, Haruka; Ando, Makoto; Motohara, Kentaro; Spitler, Lee.
In: Astrophysical Journal, Vol. 909, No. 2, 117, 01.03.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Environmental Dependence of Galactic Properties Traced by Ly alpha 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
PY - 2021/3/1
Y1 - 2021/3/1
N2 - 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 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), [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 >= 5 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 similar to 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 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 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), [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 >= 5 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 similar to 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.
KW - Galaxy formation
KW - Galaxy evolution
KW - Ly alpha forest
KW - Intergalactic medium
KW - Large-scale structure of the universe
KW - Ly alpha galaxies
KW - Emission line galaxies
KW - AGN host galaxies
U2 - 10.3847/1538-4357/abd2af
DO - 10.3847/1538-4357/abd2af
M3 - Journal article
VL - 909
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 117
ER -
ID: 258271976