English

The Galaxy Zoo Catalogs for the Galaxy And Mass Assembly (GAMA) Survey

Astrophysics of Galaxies 2024-10-29 v1

Abstract

Galaxy Zoo is an online project to classify morphological features in extra-galactic imaging surveys with public voting. In this paper, we compare the classifications made for two different surveys, the Dark Energy Spectroscopic Instrument (DESI) imaging survey and a part of the Kilo-Degree Survey (KiDS), in the equatorial fields of the Galaxy And Mass Assembly (GAMA) survey. Our aim is to cross-validate and compare the classifications based on different imaging quality and depth. We find that generally the voting agrees globally but with substantial scatter i.e. substantial differences for individual galaxies. There is a notable higher voting fraction in favor of ``smooth'' galaxies in the DESI+\rev{{\sc zoobot}} classifications, most likely due to the difference between imaging depth. DESI imaging is shallower and slightly lower resolution than KiDS and the Galaxy Zoo images do not reveal details such as disk features \rev{and thus are missed in the {\sc zoobot} training sample}. \rev{We check against expert visual classifications and find good agreement with KiDS-based Galaxy Zoo voting.} We reproduce the results from Porter-Temple+ (2022), on the dependence of stellar mass, star-formation, and specific star-formation on the number of spiral arms. This shows that once corrected for redshift, the DESI Galaxy Zoo and KiDS Galaxy Zoo classifications agree well on population properties. The zoobot cross-validation increases confidence in its ability to compliment Galaxy Zoo classifications and its ability for transfer learning across surveys.

Keywords

Cite

@article{arxiv.2410.19985,
  title  = {The Galaxy Zoo Catalogs for the Galaxy And Mass Assembly (GAMA) Survey},
  author = {Benne W. Holwerda and Clayton Robertson and Kyle Cook and Kevin A. Pimbblet and Sarah Casura and Anne E. Sansom and Divya Patel and Trevor Butrum and David H. W. Glass and Lee Kelvin and Ivan K. Baldry and Roberto De Propris and Steven Bamford and Karen Masters and Maria Stone and Tim Hardin and Mike Walmsley and Jochen Liske and S M Rafee Adnan},
  journal= {arXiv preprint arXiv:2410.19985},
  year   = {2024}
}

Comments

20 pages, 22 figures, 8 tables, accepted for publication in PASA