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Title |
Measuring galaxy distances using cross-correlation methods |
Alternative Title |
Μέτρηση αποστάσεων γαλαξιών με την χρήση μεθόδων αλληλοσυσχέτισης |
Author
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Μαρκουδάκης, Ιωάννης
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Thesis advisor
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Ζέζας, Ανδρέας
Casadio, Carolina
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Abstract |
We are interested in developing a tool that can accurately measure the
redshift of distant galaxies, while also quantifying of the measurement’s
confidence. To accomplish that, we utilized the RVSAO package, which
is a set of tools operating in the IRAF environment. xcsao, which is the
basic task of RVSAO, implements the cross-correlation method to estimate
the redshift of an object, using a template spectrum as reference. We have
enriched the template list provided by RVSAO, by adding Sloan Digital
Sky Survey III (SDSS-III) spectra as well as composite ones, covering a
wide range of galaxy types with redshifts reaching up to z = 1.814. These
spectra were pre-processed appropriately, in order to match the RVSAO
template format. We have modeled a relation between the confidence of a
distance measurement and the signal-to-noise (SNR) of the spectra, and also
executed several simulations to thoroughly assess the method’s capabilities.
We confirm the efficiency and stability of the method for a plethora of galaxy
types, such as different types of Active Galactic Nuclei (AGN) and quasars.
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Language |
English |
Issue date |
2023-11-22 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/5/a/c/metadata-dlib-1697523310-269507-13013.tkl
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Views |
416 |