27 May 2019 to 5 June 2019
Cargèse
Europe/Paris timezone

A. Mohapatra: Physical conditions in high-z CIII absorbers: origin and stability

3 Jun 2019, 18:30
10m
Amphitheatre (Cargèse)

Amphitheatre

Cargèse

Institut d’Etudes Scientifiques de Cargèse Menasina F-20130 CARGÈSE

Speaker

Abhishek Mohapatra (NIT Rourkela, India)

Description

In this talk, I will present detailed photoionization models of well-aligned optically thin doubly ionized carbon (C III) absorption components at 2.1 ≤ z ≤ 3.4. Our inferred density and overdensity (∆) favor the absorption originating from gas associated with circumgalactic medium and probably not in hydrostatic equilibrium. We discuss statistically significant redshift evolution of our derived parameters. We show L vs. [C/H] can be well reproduced if L is governed by the product of gas cooling time and sound crossing speed as expected in the case of cloud formation under thermal instabilities. As noted in the literature survivability of such cloud over longer time-scale is an issue. Therefore, studying the optically thin C III absorbers over a large z range and probably correlating their z evolution with global star formation rate density evolution can shed light to the physics of circumgalactic medium formation and evolution.

Presentation Materials