Preliminary Target Selection for the DESI Bright Galaxy Survey (BGS)
Abstract
The Dark Energy Spectroscopic Instrument (DESI) will execute a nearly magnitude-limited survey of low redshift galaxies (0.05 ≤ z ≤ 0.4, median z ≈ 0.2). Clustering analyses of this Bright Galaxy Survey (BGS) will yield the most precise measurements to date of baryon acoustic oscillations and redshift-space distortions at low redshift. DESI BGS will comprise two target classes: (i) BRIGHT (r < 19.5 mag), and (ii) FAINT (19.5 < r < 20 mag). Here we present a summary of the star-galaxy separation, and different photometric and geometrical masks, used in BGS to reduce the number of spurious targets. The selection results in a total density of ∼800 objects deg-2 for the BRIGHT and ∼600 objects deg-2 for the FAINT selections. A full characterization of the BGS selection can be found in Ruiz-Macias et al.
- Publication:
-
Research Notes of the American Astronomical Society
- Pub Date:
- October 2020
- DOI:
- 10.3847/2515-5172/abc25a
- arXiv:
- arXiv:2010.11283
- Bibcode:
- 2020RNAAS...4..187R
- Keywords:
-
- Galaxies;
- Redshift surveys;
- Observational cosmology;
- Large-scale structure of the universe;
- Catalogs;
- 573;
- 1378;
- 1146;
- 902;
- 205;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 3 pages, 1 figure