Persistent Link:
http://hdl.handle.net/10150/297785
Title:
Improving Photometric Redshift Measurements Using BPZ
Author:
St. Germaine, Michael Tyler
Issue Date:
2013
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Redshift measurements are used in astrophysics to measure distances and to constrain fundamental cosmological quantities. Although spectroscopic redshifts (spec-z) are much more reliable than photometric redshifts (photo-z), they are much more difficult or time-consuming to obtain. We seek to optimize photo-z measurements, i.e. bring their values closer to the "true" spec-z values, by using a tool called BPZ. We investigate the changes in photo-z resulting from modified galaxy templates using the SDSS catalogue of galaxies. We also consider the effect of adding artificial noise to galaxy spectra. The photo-z values were most improved when the templates contained emission lines, and noise of the same degree as in the catalogue.
Type:
text; Electronic Thesis
Degree Name:
B.S.
Degree Level:
bachelors
Degree Program:
Honors College; Physics
Degree Grantor:
University of Arizona
Advisor:
Cheu, Elliott

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleImproving Photometric Redshift Measurements Using BPZen_US
dc.creatorSt. Germaine, Michael Tyleren_US
dc.contributor.authorSt. Germaine, Michael Tyleren_US
dc.date.issued2013-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractRedshift measurements are used in astrophysics to measure distances and to constrain fundamental cosmological quantities. Although spectroscopic redshifts (spec-z) are much more reliable than photometric redshifts (photo-z), they are much more difficult or time-consuming to obtain. We seek to optimize photo-z measurements, i.e. bring their values closer to the "true" spec-z values, by using a tool called BPZ. We investigate the changes in photo-z resulting from modified galaxy templates using the SDSS catalogue of galaxies. We also consider the effect of adding artificial noise to galaxy spectra. The photo-z values were most improved when the templates contained emission lines, and noise of the same degree as in the catalogue.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
thesis.degree.nameB.S.en_US
thesis.degree.levelbachelorsen_US
thesis.degree.disciplineHonors Collegeen_US
thesis.degree.disciplinePhysicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorCheu, Elliott-
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