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Galaxy Zoo Morphology and Photometric Redshifts in the Sloan Digital Sky Survey
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2011 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 734, L9-L13 p.Article in journal (Refereed) Published
Abstract [en]

It has recently been demonstrated that one can accurately derive galaxy morphology from particular primary and secondary isophotal shape estimates in the Sloan Digital Sky Survey (SDSS) imaging catalog. This was accomplished by applying Machine Learning techniques to the Galaxy Zoo morphology catalog. Using the broad bandpass photometry of the SDSS in combination with precise knowledge of galaxy morphology should help in estimating more accurate photometric redshifts for galaxies. Using the Galaxy Zoo separation for spirals and ellipticals in combination with SDSS photometry we attempt to calculate photometric redshifts. In the best case we find that the root-mean-square error for luminous red galaxies classified as ellipticals is as low as 0.0118. Given these promising results we believe better photometric redshift estimates for all galaxies in the SDSS (~350 million) will be feasible if researchers can also leverage their derived morphologies via Machine Learning. These initial results look to be promising for those interested in estimating weak lensing, baryonic acoustic oscillation, and other fields dependent upon accurate photometric redshifts.

Place, publisher, year, edition, pages
2011. Vol. 734, L9-L13 p.
Keyword [en]
galaxies: distances and redshifts, methods: statistical
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-169800DOI: 10.1088/2041-8205/734/1/L9OAI: oai:DiVA.org:uu-169800DiVA: diva2:507979
Available from: 2012-03-07 Created: 2012-03-06 Last updated: 2012-10-18Bibliographically approved

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