A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies
Department of Math and Computer Science, Lawrence Technological University, Southfield, MI 48075, USA
Author to whom correspondence should be addressed.
Received: 4 April 2018 / Revised: 31 May 2018 / Accepted: 8 June 2018 / Published: 11 June 2018
PDF [3723 KB, uploaded 12 June 2018]
We created a catalog of photometric redshift of ∼3,000,000 SDSS galaxies annotated by their broad morphology. The photometric redshift was optimized by testing and comparing several pattern recognition algorithms and variable selection strategies, and was trained and tested on a subset of the galaxies in the catalog that had spectra. The galaxies in the catalog have i magnitude brighter than 18 and Petrosian radius greater than 5.5
. The majority of these objects are not included in previous SDSS photometric redshift catalogs such as the photoz
table of SDSS DR12. Analysis of the catalog shows that the number of galaxies in the catalog that are visually spiral increases until redshift of ∼0.085, where it peaks and starts to decrease. It also shows that the number of spiral galaxies compared to elliptical galaxies drops as the redshift increases.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Share & Cite This Article
MDPI and ACS Style
Paul, N.; Virag, N.; Shamir, L. A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies. Galaxies 2018, 6, 64.
Paul N, Virag N, Shamir L. A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies. Galaxies. 2018; 6(2):64.
Paul, Nicholas; Virag, Nicholas; Shamir, Lior. 2018. "A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies." Galaxies 6, no. 2: 64.
Show more citation formats
Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
[Return to top]
For more information on the journal statistics, click here
Multiple requests from the same IP address are counted as one view.