text: 283,178,1397549887521271810,1285216628884602881,Santi Ávila,"Paper Alert! <LINK> We study the clustering of HI gas as observed by simulated intensity mapping (HI) experiments. We investigate the effect that the telescope beam and the foreground cleaning have on the observed 2-point correlation function (2PCF). <LINK> For that, we use the UNITsims (<LINK>) coupled to the Semi-Analytic Galaxy Evolution code (presented in <LINK>).  We obtain HI from the cold gas, following 2 different prescriptions. We study the HI to halo mass relation and total HI abundace. We create IM pixels. The telescope beam is simulated by a Gaussian smoothing on the angular coordinates. The Foreground cleaning algorithms remove any smooth signal with frecuency, resulting in an exponential damping on the radial cosmological signal. We study the observational effects on different types of 2PCF: - Anisotropic (r_per, r_parallel) - mu-wedges - Radial We find that the BAO is still visible for a SKA-like survey! with @CunningtonSD and others",https://arxiv.org/abs/2105.10454,"We study the clustering of HI intensity maps produced from simulations with a focus on baryonic acoustic oscillations (BAO) and the effects induced by telescope beam smoothing and foreground cleaning. We start by creating a HI catalogue at $z=1.321$ based on the Semi-Analytic Galaxy Evolution (SAGE) model applied to the UNIT simulations. With this catalogue we investigate the relation between model HI and the dark matter haloes and we also study the abundance of HI, $\Omega_{\rm HI}$, predicted by this model. We then create synthetic HI intensity maps with a Nearest-Grid-Point approach. In order to simulate the telescope beam effect, a Gaussian smoothing is applied on the plane perpendicular to the line of sight. The effect of foreground removal methods is simulated by exponentially damping the largest wavelength Fourier modes on the radial direction. We study the anisotropic 2-point correlation function (2PCF) $\xi(r_\perp,r_\parallel)$ and how it is affected by the aforementioned observational effects. In order to better isolate the BAO signal, we study several 2PCF $\mu$-wedges (with a restricted range of orientations $\mu$) tailored to address the systematics effects and we compare them with different definitions of radial 2PCFs. Finally, we discuss our findings in the context of an SKA-like survey, finding a clear BAO signal in most of the estimators here proposed. ","HI intensity mapping correlation function from UNIT simulations: BAO and