SDSS-IV MaNGA: Modeling the spectral line-spread function to subpercent accuracy
| Autor: | Niv Drory, Daniel Lazarz, Michele Cappellari, Shravan Shetty, Kyle B. Westfall, Matthew A. Bershady, Brian Cherinka, Yanping Chen, David R. Law, Joel R. Brownstein, Francesco Belfiore, Dmitry Bizyaev, Renbin Yan |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics Astrophysics Function (mathematics) 01 natural sciences Astrophysics - Astrophysics of Galaxies Spectral line Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Spectroscopy Astrophysics - Instrumentation and Methods for Astrophysics 010303 astronomy & astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.3847/1538-3881/abcaa2 |
| Popis: | The SDSS-IV Mapping Nearby Galaxies at APO (MaNGA) program has been operating from 2014-2020, and has now observed a sample of 9,269 galaxies in the low redshift universe (z ~ 0.05) with integral-field spectroscopy. With rest-optical (\lambda\lambda 0.36 - 1.0 um) spectral resolution R ~ 2000 the instrumental spectral line-spread function (LSF) typically has 1sigma width of about 70 km/s, which poses a challenge for the study of the typically 20-30 km/s velocity dispersion of the ionized gas in present-day disk galaxies. In this contribution, we present a major revision of the MaNGA data pipeline architecture, focusing particularly on a variety of factors impacting the effective LSF (e.g., undersampling, spectral rectification, and data cube construction). Through comparison with external assessments of the MaNGA data provided by substantially higher-resolution R ~ 10,000 instruments we demonstrate that the revised MPL-10 pipeline measures the instrumental line spread function sufficiently accurately ( 50. Velocity dispersions derived from [O II], Hbeta, [O III], [N II], and [S II] are consistent with those derived from Halpha to within about 2% at sigma_Halpha > 30 km/s. Although the impact of these changes to the estimated LSF will be minimal at velocity dispersions greater than about 100 km/s, scientific results from previous data releases that are based on dispersions far below the instrumental resolution should be reevaulated. Comment: 26 pages, 23 figures. Accepted for publication in AJ |
| Databáze: | OpenAIRE |
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