Evolution of barred galaxies and associated structures

Kruk, S

Abstract:: Bars are common in disc galaxies along with many associated structures such as disc-like bulges, boxy/peanut bulges, rings, etc. They are a sign of maturity of disc galaxies and can play an important role in their evolution. In this thesis, I investigate the specific role bars play in quenching the star formation in, and shaping of their host galaxies.

In order to test how bars affect their host galaxies, I study the discs, bars and bulges of what is currently the largest sample of ...
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APA Style

Kruk, S. (2018). Evolution of barred galaxies and associated structures [PhD thesis]. University of Oxford.

MLA Style

Kruk, S. Evolution of Barred Galaxies and Associated Structures. University of Oxford, 2018.

Chicago Style

Kruk, S. 2018. “Evolution of Barred Galaxies and Associated Structures.” PhD thesis, University of Oxford.
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Files:: Sandor_Kruk_Thesis_ORA.pdf

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Authors

+ Kruk, S More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Astrophysics
Role:: Author

Contributors

+ Lintott, C

Department:: University of Oxford
Role:: Supervisor

+ Cappellari, M

Department:: University of Oxford
Role:: Examiner

+ James, P

Department:: Liverpool John Moores University
Role:: Examiner

+ Science and Technology Facilities Council More from this funder

Grant:: ST/MJ0371X/1

DOI:: 10.5287/ora-1a424xm75
Type of award:: DPhil
Level of award:: Doctoral
Awarding institution:: University of Oxford

Language:: English
Keywords:: Extragalactic Astrophysics

Dwarf Galaxies

Barred Galaxies

Galaxy Evolution

Galaxy Structure

Quenching
Subjects:: Astronomy

Astrophysics
UUID:: uuid:34cc9283-a386-464f-b9ae-1d4e3b4fdf77
Deposit date:: 2018-10-29

Related item:: Galaxy Zoo: secular evolution of barred galaxies from structural decomposition of multiband images
Description:: We present the results of two-component (disc+bar) and three-component (disc+bar+bulge) multiwavelength 2D photometric decompositions of barred galaxies in five Sloan Digital Sky Survey (SDSS) bands (ugriz). This sample of ∼3500 nearby (z < 0.06) galaxies with strong bars selected from the Galaxy Zoo citizen science project is the largest sample of barred galaxies to be studied using photometric decompositions that include a bar component. With detailed structural analysis, we obtain physical quantities such as the bar- and bulge-to-total luminosity ratios, effective radii, Sérsic indices and colours of the individual components. We observe a clear difference in the colours of the components, the discs being bluer than the bars and bulges. An overwhelming fraction of bulge components have Sérsic indices consistent with being pseudo-bulges. By comparing the barred galaxies with a mass-matched and volume-limited sample of unbarred galaxies, we examine the connection between the presence of a large-scale galactic bar and the properties of discs and bulges. We find that the discs of unbarred galaxies are significantly bluer compared to the discs of barred galaxies, while there is no significant difference in the colours of the bulges. We find possible evidence of secular evolution via bars that leads to the build-up of pseudo-bulges and to the quenching of star formation in the discs. We identify a subsample of unbarred galaxies with an inner lens/oval and find that their properties are similar to barred galaxies, consistent with an evolutionary scenario in which bars dissolve into lenses. This scenario deserves further investigation through both theoretical and observational work.
Related item:: Galaxy Zoo: finding offset discs and bars in SDSS galaxies
Description:: We use multiwavelength Sloan Digital Sky Survey (SDSS) images and Galaxy Zoo morphologies to identify a sample of ˜270 late-type galaxies with an off-centre bar. We measure offsets in the range 0.2-2.5 kpc between the photometric centres of the stellar disc and stellar bar. The measured offsets correlate with global asymmetries of the galaxies, with those with largest offsets showing higher lopsidedness. These findings are in good agreement with predictions from simulations of dwarf-dwarf tidal interactions producing off-centre bars. We find that the majority of galaxies with off-centre bars are of Magellanic type, with a median mass of 109.6 M⊙, and 91 per cent of them having M⋆ < 3 × 1010 M⊙, the characteristic mass at which galaxies start having higher central concentrations attributed to the presence of bulges. We conduct a search for companions to test the hypothesis of tidal interactions, but find that a similar fraction of galaxies with offset bars have companions within 100 kpc as galaxies with centred bars. Although this may be due to the incompleteness of the SDSS spectroscopic survey at the faint end, alternative scenarios that give rise to offset bars such as interactions with dark companions or the effect of lopsided halo potentials should be considered. Future observations are needed to confirm possible low-mass companion candidates and to determine the shape of the dark matter halo, in order to find the explanation for the off-centre bars in these galaxies.

Terms of use

Copyright holder:: Kruk, S; . Sandor J Kruk

Licence:: Terms and Conditions of Use for Oxford University Research Archive

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Evolution of barred galaxies and associated structures

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