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Siena Galaxy Atlas 2020

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arxiv 2307.04888 v1 pith:BSBFAD3X submitted 2023-07-10 astro-ph.GA

Siena Galaxy Atlas 2020

John Moustakas , Dustin Lang , Arjun Dey , St\'ephanie Juneau , Aaron Meisner , Adam D. Myers , Edward F. Schlafly , David J. Schlegel
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Francisco Valdes Benjamin A. Weaver Rongpu Zhou
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classification astro-ph.GA
keywords atlasimagingopticalgalaxiessga-2020arcsecdesigalaxy
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We present the 2020 version of the Siena Galaxy Atlas (SGA-2020), a multi-wavelength optical and infrared imaging atlas of 383,620 nearby galaxies. The SGA-2020 uses optical $grz$ imaging over $\approx20,000$ deg$^{2}$ from the DESI Legacy Imaging Surveys Data Release 9 and infrared imaging in four bands (spanning 3.4-22 $\mu$m) from the six-year unWISE coadds; it is more than 95% complete for galaxies larger than $R(26)\approx25$ arcsec and $r<18$ measured at the 26 mag arcsec$^{-2}$ isophote in the $r$-band. The atlas delivers precise coordinates, multi-wavelength 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 Dark Energy Spectroscopic Instrument (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 multi-messenger astronomical events; and more.

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Cited by 2 Pith papers

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  1. Weak Evolution of Cosmic Atomic Hydrogen over the Past 4.5 Billion Years

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    Combining FAST and DESI data for 2.5 million galaxies shows cosmic atomic hydrogen density declined by only a factor of 1.35 over 4.5 Gyr, far less than the 2.46-fold decline in star formation.

  2. Constraints on the population level distribution of nearby Dark Matter halo shapes with extragalactic streams

    astro-ph.GA 2026-07 conditional novelty 5.5

    A gold subsample of 17 photometry-only extragalactic streams yields a mildly oblate dark-matter halo population with mean flattening μ_q ≈ 0.72 and scatter σ_q ≈ 0.34.