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Optical and near-infrared surface photometry of quiescent dwarf galaxies

Yildiz, U. (2008) Optical and near-infrared surface photometry of quiescent dwarf galaxies. Master's Thesis / Essay, Astronomy.

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We have presented optical and near-IR surface photometry for quiescent dwarf galaxies (dEs). For this purpose, we have obtained optical images from SDSS (Sloan Digital Sky Survey) and near-IR images (H & K bands) from Magpop-ITP (Multi-wavelength Analysis of Galaxy Populations-international Time Programme) training network. The Magpop-ITP research has an importance that is the first study of quiescent dwarf galaxies which includes a detailed investigation of field systems. The near-IR sample contains the high resolution images of 33 quiescent and 22 star-forming dwarf galaxies which are in the Virgo Cluster and in the field. However, we mostly focus on quiescent dwarf galaxies. By doing surface photometry we obtain optical and optical - near-IR colours and colour gradients. By analyzing these colours and colour gradients together with comparing the LICK/IDS spectroscopic line strength indices, we have extracted physical information about their metallicity and star formation history. The major results from this research are; • Star-forming and quiescent dwarf galaxies can be well seperated in optical vs. UV colour-magnitude diagrams and as well as colour-colour diagrams. • We do not find any differences between field and cluster dwarf galaxies as a function of environment. • By making a comparison to stellar populations models we find that the qui-escent dwarfs have Sub-Solar or Solar metallicities. Their ages range between 4-10 Gyrs and therefore they are not expected to be primordial. • Quiescent dwarfs (dEs) have similar colour gradients as giant ellipticals (Es) but less metal rich.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:30
Last Modified: 15 Feb 2018 07:30

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