Active galaxies: A study of local seyferts and ultra luminous infrared galaxies
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- Tez No: 401733
- Danışmanlar: PROF. MARIANNE VESTERGAARD
- Tez Türü: Doktora
- Konular: Astronomi ve Uzay Bilimleri, Astronomy and Space Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2014
- Dil: İngilizce
- Üniversite: Københavns Universitet (University of Copenhagen)
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Astronomi Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 205
Özet
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Özet (Çeviri)
Galaxy formation and evolution is one of the main research themes of modern astronomy. Active galaxies such as Active Galactic Nuclei (AGN) and Ultraluminous Infrared Galaxies (ULIRGs) are important evolutionary stages of galaxies. The ULIRG stage is mostly associated with galaxy mergers and interactions. During the interactions of gas-rich galaxies, the gas inflows towards the centers of the galaxies and can trigger both star formation and AGN activity. The ULIRG stage includes rapid star formation activity and fast black hole growth that is enshrouded by dust. Once the AGN emission is sufficiently powerful, energy feedback from the AGN blows away the gas fuel and shuts off both the star formation and the black hole growth. In this thesis I study local AGN and ULIRGs. I address 2 different studies of AGN: one is related to the potential use of AGN to measure cosmic distances and the other one is related to the mass estimates of supermassive black holes (SMBHs). Mass estimates of SMBHs are important to understand the formation and evolution of SMBHs and their host galaxies. Black hole masses in Type 1 AGN are measured with the reverberation mapping (RM) technique. Reverberation mapping analyses of !50 nearby AGN show a tight correlation between the broad line region (BLR) radius (R) and the mean optical luminosity (L) that is known as the R − L relationship. The R − L relationship traditionally is used to formulate the mass scaling relationships, which are used estimate BH masses based on a single-epoch spectrum. Recently, it has been shown that the R − L relationship can also be used to measure cosmic distances beyond redshifts that can be probed by supernovae. The current local (z
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