Astronomers have released the Siena Galaxy Atlas (SGA), which contains detailed information on over 380,000 galaxies. The SGA is available to both researchers and amateur astronomers. 

The SGA is different from previous cosmic atlases because it uses state-of-the-art digital images captured by advanced technology. Previous atlases relied on antiquated equipment and photographic plates. The SGA also has a greater level of accuracy than ever before. 

The SGA illustrates the tremendous range of types, sizes, colors, surface brightness profiles, internal structure, and environments of the galaxies. The horizontal white bar in the lower-left corner of each panel represents 1 arcminute and the mosaic cutouts range from 3.2 to 13.4 arcminutes. 

Mapping the night sky is essential for understanding our universe. These resources must be routinely updated to reflect the continuous technological improvements of telescopes

The Siena Galaxy Atlas (SGA) is a compilation of data from three surveys completed between 2014 and 2017 known as the DESI Legacy Surveys, which were carried out to identify galaxy targets for the Dark Energy Spectroscopic Instrument (DESI) survey

Nearby large galaxies are important because we can study them in more detail than any other galaxies in the Universe; they are our cosmic neighbors,” said Siena College’s Professor John Moustakas, SGA project leader.

“Not only are they strikingly beautiful, but they also hold the key to understanding how galaxies form and evolve, including our very own Milky Way Galaxy

The public release of these spectacular data contained in the atlas will have a real impact not only on astronomical research, but also on the public’s ability to view and identify relatively nearby galaxies,” says Chris Davis, NSF Program Director for NOIRLab. “Dedicated amateur astronomers will particularly love this as a go-to resource for learning more about some of the celestial targets they observe.

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