The Galaxy Zoo Catalogs for the Galaxy And Mass Assembly (GAMA) Survey
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 (...
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Zusammenfassung: | 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. |
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DOI: | 10.48550/arxiv.2410.19985 |