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Program Information for 2021A-0149


PI: Alfredo Zenteno, NOIRLab, alfredo.zenteno@noirlab.edu
Address: CTIO, Casilla 603, La Serena, Coquimbo Chile

CoI: Regis Cartier, NOIRLab
CoI: Kathy Vivas, NOIRLab
CoI: Rodrigo Carrasco, NOIRLab
CoI: Marcelle Soares-Santos, Brandeis U.
CoI: Alex Drlica-Wagner, FNAL
CoI: Arjun Dey, NOIRLab
CoI: Scott Anderson, U. of Washington
CoI: W. Niel Brandt, Pennsylvania State U.
CoI: Jose L Nilo Castellon, Universidad de La Serena
CoI: Valeria Mesa, Universidad de La Serena
CoI: Hector Cuevas, Universidad de La Serena
CoI: Amelia Ramirez, Universidad de La Serena
CoI: Patricia Arevalo, Universidad de Valparaiso
CoI: Joseph Mohr, Ludwig-Maximilians-Universitat, Munich, Germany
CoI: Daniel Hernandez-Lang, Ludwig-Maximilians-Universitat, Munich, Germany
CoI: Matthias Klein, Ludwig-Maximilians-Universitat, Munich, Germany
CoI: Sebastian Grandis, Ludwig-Maximilians-Universitat, Munich, Germany
CoI: Andrea Merloni, Max Planck Institut fuer extraterrestrische Physik
CoI: M Salvato, Max Planck Institut fuer extraterrestrische Physik
CoI: Johan Comparat, Max Planck Institut fuer extraterrestrische Physik
CoI: Tom Dwelly, Max Planck Institut fuer extraterrestrische Physik
CoI: Nicola Napolitano, National Institute of Astrophysics, Napoli, Italy
CoI: Mario Radovich, National Institute of Astrophysics, Padova, Italy
CoI: Richard McMahon, University of Cambridge

Title: The DECam eROSITA Survey (DeROSITAS)

Abstract: The eROSITA X--ray telescope was launched on July 13, 2019, beginning full scientific operations on Oct 15th. During the ongoing 4 year all-sky survey phase, eROSITA will identify $sim 10^5$ galaxy clusters more massive than 10$^{rm 14}$ M$_odot$ and $sim 3times 10^6$ AGN. We request 12.5 nights in 2021A to provide optical imaging of the German eROSITA extragalactic sky. Reaching depths of $m^*+1$ for redshift $zsim1$ cluster red-sequence galaxies, this data will enable the optical confirmation and photometric redshift estimation of $sim 5times10^4$ clusters and the identification of .5times10^6$ AGN. With a depth of $g=22.7$, $r=23.0$, $i=23.0$, $z=22.3$ at 10$sigma$, we will be able to identify the optical counterparts of the clusters and compute robust cluster redshifts. The completed DECam eROSITA Survey will reduce the uncertainties on the Dark Energy equation of state parameters to $sigma_wsimeq0.10$, for eROSITA clusters alone. With the proposed observations we will study (1) the cluster baryon content and its trends for mass and redshift and (2) the cluster galaxy populations, characterizing the faint end of the cluster luminosity function (at $m^*+2$) as a function of the cluster dynamical state, as a function of redshift and mass up to $zsim0.9$. In addition to the proposed observations we will provide (1) targets for approved spectroscopic surveys of eROSITA sources (e.g., 4MOST and SDSS-V), (2) high quality templates for Gravitational Wave progenitor searches, and (3) an initial epoch for the LSST sky survey.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2021A):  CT-4m/DECam -- 9.5n on Feb 02 2021, Feb 06 2021, Feb 15 2021, Feb 20 2021, Feb 22 - Feb 24 2021, Feb 26 - Feb 28 2021, Mar 04 2021, Mar 20 2021, Apr 01 2021
Run 2 (2021A):  CT-4m/DECam -- 8n on Feb 01 2021, Feb 21 2021, Mar 01 2021, Apr 21 2021, Apr 29 - May 01 2021, May 30 2021, Jul 19 - Jul 20 2021, Jul 23 - Jul 25 2021, Jul 27 2021


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