| 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. |
| Authors |
John Moustakas  , Dustin Lang , Arjun Dey , S. Juneau , Aaron M. Meisner , Adam D. Myers  , Edward F. Schlafly , David J. Schlegel , F. Valdés , B. A. Weaver , Rongpu Zhou
|
| Journal Info |
Institute of Physics | The Astrophysical Journal Supplement Series , vol: 269
, iss: 1
, pages: 3 - 3
|
| Publication Date |
10/18/2023 |
| ISSN |
0067-0049 |
Type |
article |
| Open Access |
gold
|
| DOI |
https://doi.org/10.3847/1538-4365/acfaa2 |
| Keywords |
Sloan Digital Sky Survey (Score: 0.454555)
|
