Seminars are organized jointly by the Trieste Astronomical Observatory (INAF/OATS) and the Astronomy Unit of the Physics Dept. of the Trieste University (UNI/TS). They usually take place on Wednesdays at 11:30, in the seminar room (Sala Ovale) of Villa Bazzoni in via Bazzoni 2, TS.

Wed, JUL 11, 2018 
SPEAKER: Nilandri Paul (IUCAA: Inter-University Centre for Astronomy and Astrophysics, Pune, IN)
TITLE: Halo model of HI galaxies and their scaling relations

ABSTRACT: Modelling the distribution of neutral hydrogen (HI) inside dark matter halos is a key towards studying the evolutionary history of the galaxies in the cosmological context. A popular tool for modelling the connection between galaxies and dark-matter halos is the halo occupation distribution model (HOD). The speaker will talk about a novel approach, based on this HOD framework, to infer the HI-dark matter connection at the massive end of HI galaxies from radio HI emission surveys, using optical properties of low-redshift galaxies as an intermediary. This scaling model constrained using the two-point correlation function and the mass function data of HI galaxies from the ALFALFA survey produce relations consistent with the semi-analytical models of galaxy formation and direct observations from matched sample analysis. Some preliminary forecasts based on this model for future observations of HI and optical galaxies from SKA and EUCLID/LSST will also be discussed.