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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31309
Title: SDSS-IV MaNGA: Refining Strong Line Diagnostic Classifications Using Spatially Resolved Gas Dynamics
Authors: Law, David R.
Ji, Xihan
BELFIORE, FRANCESCO MICHEL CONCETTO 
Bershady, Matthew A.
Cappellari, Michele
Westfall, Kyle B.
Yan, Renbin
Bizyaev, Dmitry
Brownstein, Joel R.
Drory, Niv
Andrews, Brett H.
Issue Date: 2021
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 915
Issue: 1
First Page: 35
Abstract: We use the statistical power of the MaNGA integral-field spectroscopic galaxy survey to improve the definition of strong line diagnostic boundaries used to classify gas ionization properties in galaxies. We detect line emission from 3.6 million spaxels distributed across 7400 individual galaxies spanning a wide range of stellar masses, star formation rates, and morphological types, and find that the gas-phase velocity dispersion σ<SUB>Hα</SUB> correlates strongly with traditional optical emission-line ratios such as [S II]/Hα, [N II]/Hα, [O I]/Hα, and [O III]/Hβ. Spaxels whose line ratios are most consistent with ionization by galactic H II regions exhibit a narrow range of dynamically cold line-of-sight velocity distributions (LOSVDs) peaked around 25 km s<SUP>-1</SUP> corresponding to a galactic thin disk, while those consistent with ionization by active galactic nuclei (AGNs) and low-ionization emission-line regions (LI(N)ERs) have significantly broader LOSVDs extending to 200 km s<SUP>-1</SUP>. Star-forming, AGN, and LI(N)ER regions are additionally well separated from each other in terms of their stellar velocity dispersion, stellar population age, Hα equivalent width, and typical radius within a given galaxy. We use our observations to revise the traditional emission-line diagnostic classifications so that they reliably identify distinct dynamical samples both in two-dimensional representations of the diagnostic line ratio space and in a multidimensional space that accounts for the complex folding of the star-forming model surface. By comparing the MaNGA observations to the SDSS single-fiber galaxy sample, we note that the latter is systematically biased against young, low-metallicity star-forming regions that lie outside of the 3″ fiber footprint.
URI: http://hdl.handle.net/20.500.12386/31309
URL: https://iopscience.iop.org/article/10.3847/1538-4357/abfe0a
https://api.elsevier.com/content/abstract/scopus_id/85109964018
ISSN: 0004-637X
DOI: 10.3847/1538-4357/abfe0a
Bibcode ADS: 2021ApJ...915...35L
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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2011.06012.pdfpreprint5.38 MBAdobe PDFView/Open
Law_2021_ApJ_915_35.pdf[Administrators only]4.48 MBAdobe PDF
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