A coevolution study for the most extreme star factories and most active black holes

Eissa, Ismail Ahmed Eissa (2024) A coevolution study for the most extreme star factories and most active black holes. Master's Thesis / Essay, Astronomy.

Preview	Text ThesisIsmail.pdf Download (5MB) | Preview
	Text toestemming.pdf Restricted to Registered users only Download (513kB)

Abstract

We study the co-evolution between host galaxies and their central supermassive black hole (SMBH) with an unprecedented large sample of SDSS type-1 quasars which are also detected by the far-infrared (FIR) SPIRE instrument on Herschel. This subsample of optical quasars, newly identified as `cold quasars', provide a unique opportunity to study systems for which both star-formation activity and active galactic nucleus (AGN) activity are at the most extreme. We aim to construct the cosmic star formation history (CSFH) and black hole accretion rate density (BHARD) within the same systems using IR and X-ray luminosity functions, respectively. Thanks to the well-established FIR to radio correlation, we make use of the high angular resolution of the radio observations from telescopes such as LOFAR, Meerkat and VLA to cross-match the Herschel sources with the SDSS quasar catalog. Our sample spans a wide range of redshifts (0 < z < 5) and covers 9 extragalactic fields. We assembled an extensive multi-wavelength catalog to individually model the spectral energy distributions (SED) and derive the physical properties of the accreting SMBHs and their host galaxies. The derived BHARD shows low density compared to the CSFH at high redshifts. However, as redshift decreases, the BHARD gradually increases until it peaks at z ∼ 1, which is later than the peak of our CSFH (z = 1.5 − 2). We do not find direct evidence of AGN feedback affecting the star formation activity.

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Wang, L.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	24 Jul 2024 14:44
Last Modified:	24 Jul 2024 14:44
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/33500

Actions (login required)

View Item