The APOGEE Library of Infrared SSP Templates (A-LIST): High-resolution Simple Stellar Population Spectral Models in the H Band

Journal Article · Thu Apr 01 04:00:00 EDT 2021 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/ABD7F1· OSTI ID:23159175

Ashok, Aishwarya; Zasowski, Gail; Seth, Anil; Hasselquist, Sten; Bergsten, Galen; Boardman, Nicholas ^[1]; Cooper, Olivia ^[2]; Bizyaev, Dmitry ^[3]; Goytia, Sofia Meneses ^[4]; García-Hernández, D. A. ^[5]; Roman-Lopes, Alexandre ^[6]

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1. Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 (United States)
2. Department of Astronomy, The University of Texas at Austin, 2515 Speedway Boulevard Stop C1400, Austin, TX 78712 (United States)
3. Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM, 88349-0059 (United States)
4. Department of Physics, Astrophysics Research Group, University of Surrey, Guildford, Surrey, GU2 7X (United Kingdom)
5. Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife (Spain)
6. Departamento de Física, Facultad de Ciencias, Universidad de La Serena, Cisternas 1200, La Serena (Chile)

Integrated light spectroscopy from galaxies can be used to study the stellar populations that cannot be resolved into individual stars. This analysis relies on stellar population synthesis (SPS) techniques to study the formation history and structure of galaxies. However, the spectral templates available for SPS are limited, especially in the near-infrared (near-IR). We present A-LIST (APOGEE Library of Infrared SSP Templates), a new set of high-resolution, near-IR SSP spectral templates spanning a wide range of ages (2–12 Gyr), metallicities ( − 2.2 < [M/H] < + 0.4) and α abundances ( − 0.2 < [α/M] < + 0.4). This set of SSP templates is the highest resolution (R ∼ 22, 500) available in the near-IR, and the first such based on an empirical stellar library. Our models are generated using spectra of ∼300,000 stars spread across the Milky Way, with a wide range of metallicities and abundances, from the APOGEE survey. We show that our model spectra provide accurate fits to M31 globular cluster spectra taken with APOGEE, with best-fit metallicities agreeing with those of previous estimates to within ∼0.1 dex. We also compare these model spectra to lower-resolution E-MILES models and demonstrate that we recover the ages of these models to within ∼1.5 Gyr. This library is available in https://github.com/aishashok/ALIST-library.

• OSTI ID: 23159175
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 4 Vol. 161; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
79 ASTRONOMY AND ASTROPHYSICS
METALLICITY
MILKY WAY
SPECTRA
SPECTROSCOPY
STARS