Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
Abstract
APOGEE-2 is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemo-dynamical mapping of the Milky Way Galaxy. The targeting for APOGEE-2 is complex and has evolved with time. In this paper, we present the updates and additions to the initial targeting strategy for APOGEE-2N presented in Zasowski et al. (2017). These modifications come in two implementation modes: (i) "Ancillary Science Programs" competitively awarded to SDSS-IV PIs through proposal calls in 2015 and 2017 for the pursuit of new scientific avenues outside the main survey, and (ii) an effective 1.5-year expansion of the survey, known as the Bright Time Extension, made possible through accrued efficiency gains over the first years of the APOGEE-2N project. For the 23 distinct ancillary programs, we provide descriptions of the scientific aims, target selection, and how to identify these targets within the APOGEE-2 sample. The Bright Time Extension permitted changes to the main survey strategy, the inclusion of new programs in response to scientific discoveries or to exploit major new datasets not available at the outset of the survey design, and expansions of existing programs to enhance their scientific success and reach. After describing the motivations, implementation, and assessment of these programs, we also leave a summary of lessons learned from nearly a decade of APOGEE-1 and APOGEE-2 survey operations. A companion paper, Santana et al. (submitted), provides a complementary presentation of targeting modifications relevant to APOGEE-2 operations in the Southern Hemisphere.
Cite
@article{arxiv.2108.11907,
title = {Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey},
author = {Rachael L. Beaton and Ryan J. Oelkers and Christian R. Hayes and Kevin R. Covey and S. D. Chojnowski and Nathan De Lee and Jennifer S. Sobeck and Steven R. Majewski and Roger Cohen and Jose Fernandez-Trincado and Penelope Longa-Pena and Julia E. O'Connell and Felipe A. Santana and Guy S. Stringfellow and Gail Zasowski and Conny Aerts and Borja Anguiano and Chad Bender and Caleb I. Canas and Katia Cunha and John Donor Scott W. Fleming and Peter M. Frinchaboy and Diane Feuillet and Paul Harding and Sten Hasselquist and Jon Holtzman and Jennifer A. Johnson and Juna A. Kollmeier and Marina Kounkel and Suvrath Mahadevan and Adrian. M. Price-Whelan and Alvaro Rojas-Arriagada and Carlos Roman-Zuniga and Edward F. Schlafly and Mathias Schultheis and Matthew Shetrone and Joshua D. Simon and Keivan G. Stassun and Amelia M. Stutz and Jamie Tayar and Johanna Teske and Andrew Tkachenko and Nick Troup and Franco D. Albareti and Dmitry Bizyaev and Jo Bovy and Adam J. Burgasser and Johan Comparat and Juan Jose Downes and Doug Geisler and Laura Inno and Arturo Manchado and Melissa K. Ness and Marc H. Pinsonneault and Francisco Prada and Alexandre Roman-Lopes and Gregory V. A. Simonian and Verne V. Smith and Renbin Yan and Olga Zamora},
journal= {arXiv preprint arXiv:2108.11907},
year = {2022}
}
Comments
59 pages; 11 Figures; 7 Tables; 2 Appendices; Submitted to Journal and Under Review; Posting to accompany papers using the SDSS-IV/APOGEE-2 Data Release 17 scheduled for December 2021