Sökning: "Active Galaxies"

Visar resultat 1 - 5 av 9 uppsatser innehållade orden Active Galaxies.

1. 1. Finding the Seeds of Supermassive Black Holes: The Direct Collapse Black Hole Scenario

   Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Weihui Li; [2023]
   Nyckelord :;

   Sammanfattning : The origin of supermassive black holes (SMBHs,∼ 10^9M⊙) in the first billion years of cosmic history remains a mystery. Direct Collapse Black Holes (DCBHs,∼ 10^4M⊙) are considered one of the most promising hypotheses for the progenitor of SMBHs, as they are believed to provide a favorable starting point as massive seeds for SMBH formation. LÄS MER

3. 2. Measuring the [C II]-to-H I connection in high-redshift absorption-selected galaxies

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Gaurav Senthil Kumar; [2022]
   Nyckelord :QSO; Quasar; Black Hole; AGN; Active Galactic Nuclei; DLA; Damped Lyman Alpha; C II; [C II]; H I; Sightline; HST; X-shooter; Spectroscopy; Echelle Spectroscope; Hyperfine transition; Hyperfine; Physics and Astronomy;

   Sammanfattning : HI neutral gas is the basic building block of galaxies. It dictates the star formation rate and hence the metal enrichment rates within high redshift galaxies. HI neutral gas cannot be directly observed beyond z ≈ 0. LÄS MER

4. 3. Study of CO Emission in Nine Hot Dust-Obscured Galaxies at z ∼3

   Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Timothy Faerber; [2021]
   Nyckelord :Galaxies; high-z; AGN; starburst; quasar; evolution; cosmology;

   Sammanfattning : Massive galaxies evolve through different phases including starburst-dominated and active galactic nuclei (AGN)-dominated phases. These phases are predicted to be prevalent at earlier times (z ∼ 2 − 3). LÄS MER

5. 4. Do variations in the initial mass function affect galaxy evolution?

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

   Författare :Mateo Prgomet; [2020]
   Nyckelord :galaxy; galaxy formation; galaxy evolution; feedback; star formation; ultra faint dwarf galaxy; initial mass function; variations; universe; redshift; hydrodynamics; cosmology; zoomed-in simulations Galaxy formation and evolution; galaxy feedback; stellar feedback; IMF variations; cosmological zoomed-in simulations; Physics and Astronomy;

   Sammanfattning : The initial mass function (IMF) describes the stellar mass distribution for a population of stars at birth. This parameter represents a topic of long standing discussion within astronomy due to its apparent insensitive nature to environmental conditions. However, in the last decade, significant evidence suggesting the contrary has been presented. LÄS MER

7. 5. Galaxy evolution in extreme environments

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Samhitha Vadlamani; [2019]
   Nyckelord :Galaxy evolution; interactions; starburst; Compact galaxy groups; Stephan s Quintet; Physics and Astronomy;

   Sammanfattning : Interactions play a crucial role in determining how galaxies evolve in terms of their morphologies and star formation histories, since the majority of the known galaxies in the nearby Universe are found to exist in groups. Compact groups of galaxies are of particular interest as they contain a small number of galaxies in dense configurations and host repeated interactions between them, enabling us to capture signatures of these interactions (e. LÄS MER