Siena Galaxy Atlas 2020

Abstract We present the 2020 version of the Siena Galaxy Atlas (SGA-2020), a multiwavelength optical and infrared imaging atlas of 383,620 nearby galaxies. The SGA-2020 uses optical grz imaging over ≈20,000 deg 2 from the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys Data Releas...

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Bibliographic Details
Published in:	The Astrophysical journal. Supplement series 2023-11, Vol.269 (1), p.3
Main Authors:	Moustakas, John, Lang, Dustin, Dey, Arjun, Juneau, Stéphanie, Meisner, Aaron, Myers, Adam D., Schlafly, Edward F., Schlegel, David J., Valdes, Francisco, Weaver, Benjamin A., Zhou, Rongpu
Format:	Article
Language:	eng
Subjects:	Celestial bodies Celestial objects catalogs Dark energy Galaxies Galaxy photometry Infrared imaging Spectroscopy Star & galaxy formation Star formation Stars & galaxies Velocity distribution
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Summary:	Abstract We present the 2020 version of the Siena Galaxy Atlas (SGA-2020), a multiwavelength optical and infrared imaging atlas of 383,620 nearby galaxies. The SGA-2020 uses optical grz imaging over ≈20,000 deg 2 from the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys Data Release 9 and infrared imaging in four bands (spanning 3.4–22 μ m) from the 6 year unWISE coadds; it is more than 95% complete for galaxies larger than R (26) ≈ 25″ and r < 18 measured at the 26 mag arcsec −2 isophote in the r band. The atlas delivers precise coordinates, multiwavelength mosaics, azimuthally averaged optical surface-brightness profiles, model images and photometry, and additional ancillary metadata for the full sample. Coupled with existing and forthcoming optical spectroscopy from the DESI, the SGA-2020 will facilitate new detailed studies of the star formation and mass assembly histories of nearby galaxies; enable precise measurements of the local velocity field via the Tully–Fisher and fundamental plane relations; serve as a reference sample of lasting legacy value for time-domain and multimessenger astronomical events; and more.
ISSN:	0067-0049 1538-4365