Environmental dependent luminosity functions of OII line emitters in the VIPERS survey: constraints on the Star Formation rate density at 0.5 ROMANELLI, ANDREA 2021/2022 Abstract Environment plays a major role in both quenching and enhancing the star formation rate (SFR) in galaxies, with a different rate as a function of redshift. However, how much of the cosmic SFR density (SFRD) depends on the environment has not been quantified in detail yet, both from an observational and a theoretical point of view. In the local Universe it is now clear that passive galaxies are mostly found in high-density environments. Many efforts have already been done in assessing the average SFRD, but only few in performing a calculation as a function of the local density in which galaxies live. In order to bridge the gap between high redshift observations and those at low z, in this thesis we study the environmental dependence of the OII-line emitters luminosity functions. Even though [OII] line is heavily affected by the attenuation from dust, it is a remarkable feature of galaxy spectra that can be observed within the visual band even above z=1. In order to better statistically constrain our analysis we used the spectroscopic catalog of VIMOS Public Extragalactic Redshift Survey (VIPERS) data, in the redshift range 0.5 Scheda Scheda DC Facoltà/Dipartimento Dipartimento di Fisica e Astronomia "Galileo Galilei" - DFA Corso di studio ASTROPHYSICS AND COSMOLOGY Laurea Magistrale (D.M. 270/2004) Anno Accademico 2021 Titolo inglese Environmental dependent luminosity functions of OII line emitters in the VIPERS survey: constraints on the Star Formation rate density at 0.5<z<1.0 Abstract in italiano Environmental dependent luminosity functions of OII line emitters in the VIPERS survey: constraints on the Star Formation rate density at 0.5<z<1.0. Parola chiave galaxy formationgalaxy evolutionStar formationSpectroscopic surveyuminosity function Relatore RODIGHIERO, GIULIA Appare nelle tipologie: Lauree magistrali

Environment plays a major role in both quenching and enhancing the star formation rate (SFR) in galaxies, with a different rate as a function of redshift. However, how much of the cosmic SFR density (SFRD) depends on the environment has not been quantified in detail yet, both from an observational and a theoretical point of view. In the local Universe it is now clear that passive galaxies are mostly found in high-density environments. Many efforts have already been done in assessing the average SFRD, but only few in performing a calculation as a function of the local density in which galaxies live. In order to bridge the gap between high redshift observations and those at low z, in this thesis we study the environmental dependence of the OII-line emitters luminosity functions. Even though [OII] line is heavily affected by the attenuation from dust, it is a remarkable feature of galaxy spectra that can be observed within the visual band even above z=1. In order to better statistically constrain our analysis we used the spectroscopic catalog of VIMOS Public Extragalactic Redshift Survey (VIPERS) data, in the redshift range 0.5<z<1. The outline of the thesis is as follow: - in the first chapter we set the scientific framework of the thesis, describing how galaxies properties and star formation processes are affected by environment. - in the second chapter we describe the design of the VIPERS survey, its selection functions and how the density field has been retrieved by the consortium. - in the third chapter we describe how we took care of the completeness of the VIPERS [OII]-line emitters subsample, how we correct for the effect of dust in order to estimate the intrinsic luminosity and what recipe has been considered to transform it into a measure of the star formation rate. - in the last chapter we present the result from the computation of the luminosity functions (both observed and intrinsic) and their dependence from the galaxy density field.

Environmental dependent luminosity functions of OII line emitters in the VIPERS survey: constraints on the Star Formation rate density at 0.5<z<1.0.