Master Thesis Defense by Miranda Kiran Husted Andersen

Title: Dense Molecular Gas Tracers in Nearby Seyfert Galaxies -Investigating the Presence and Dynamics of HCN, HCO+, CS, and C2H in the Central Regions of NGC 4253 with ALMA

Abstract: Dense gas tracers are not commonly observed in AGNs. The purpose of this project was to determine if the kinematics of the dense gas move in Keplerian orbits or are sensitive to outflows/inflows as seen with CO gas. If the dense gas has ordered motion, it can possibly be used to measure the mass of the central black hole.

In this project I analyse the dense molecular gas tracers in the centre of four nearby Seyfert galaxies measured by ALMA. For all four galaxies in our pilot study sample, CO gas is present, where two galaxies show rotation and two show signs of outflows. I only detect dense gas (HCN, HCO+, CS, C2H) in one galaxy, NGC 4253. The question is if galaxy is special?

Supervisors:

Marianne Vestergaard, University of Copenhagen, Niels Bohr Institute
Sabine Koenig - Co supervisor, Chalmers University & Onsala Space Observatory

Censor:

Jerome Chenevez- DTU Orbit

Niels Bohr Institute

Master Thesis Defense by Miranda Kiran Husted Andersen

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