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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 ($rgeq5$ $h^{-1}$ 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 $rsim3$ $h^{-1}$ 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 HI by AGNs, i.e., the proximity effect.
Powerful outflows from star-forming galaxies are expected to push away the neutral intergalactic medium (IGM) around those galaxies, and produce absorption-free gaps in the Ly-alpha forest. We analyze the abundance of gaps of various sizes in three h
The transmission of Lyman-{alpha} (Ly{alpha}) in the spectra of distant quasars depends on the density, temperature, and ionization state of the intergalactic medium (IGM). Therefore, high-redshift (z > 5) Ly{alpha} forests could be invaluable in stu
Mapping of the large-scale structure through cosmic time has numerous applications in the studies of cosmology and galaxy evolution. At $z > 2$, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Ly$alpha$,
We study the properties of Ly-alpha emitters in a cosmological framework by computing the escape of Ly-alpha photons through galactic outflows. We combine the GALFORM semi-analytical model of galaxy formation with a Monte Carlo Ly-alpha radiative tra
Galaxy clusters are widely used to constrain cosmological parameters through their properties, such as masses, luminosity and temperature distributions. One should take into account all kind of biases that could affect these analyses in order to obta