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SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies

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SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies. / Belfiore, Francesco; Maiolino, Roberto; Tremonti, Christy; Sánchez, Sebastian F.; Bundy, Kevin; Bershady, Matthew; Westfall, Kyle; Lin, Lihwai; Drory, Niv; Boquien, Médéric; Thomas, Daniel; Brinkmann, Jonathan.

In: Monthly Notices of the Royal Astronomical Society, Vol. 469, No. 1, 07.2017, p. 151-170.

Research output: Contribution to journalArticle

Harvard

Belfiore, F, Maiolino, R, Tremonti, C, Sánchez, SF, Bundy, K, Bershady, M, Westfall, K, Lin, L, Drory, N, Boquien, M, Thomas, D & Brinkmann, J 2017, 'SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies', Monthly Notices of the Royal Astronomical Society, vol. 469, no. 1, pp. 151-170. https://doi.org/10.1093/mnras/stx789

APA

Belfiore, F., Maiolino, R., Tremonti, C., Sánchez, S. F., Bundy, K., Bershady, M., Westfall, K., Lin, L., Drory, N., Boquien, M., Thomas, D., & Brinkmann, J. (2017). SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies. Monthly Notices of the Royal Astronomical Society, 469(1), 151-170. https://doi.org/10.1093/mnras/stx789

Vancouver

Belfiore F, Maiolino R, Tremonti C, Sánchez SF, Bundy K, Bershady M et al. SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies. Monthly Notices of the Royal Astronomical Society. 2017 Jul;469(1):151-170. https://doi.org/10.1093/mnras/stx789

Author

Belfiore, Francesco ; Maiolino, Roberto ; Tremonti, Christy ; Sánchez, Sebastian F. ; Bundy, Kevin ; Bershady, Matthew ; Westfall, Kyle ; Lin, Lihwai ; Drory, Niv ; Boquien, Médéric ; Thomas, Daniel ; Brinkmann, Jonathan. / SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 469, No. 1. pp. 151-170.

Bibtex

@article{14e3bb08b371494fac8d11397c59787a,
title = "SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies",
abstract = "We study the gas phase metallicity (O/H) and nitrogen abundance gradients traced by star-forming regions in a representative sample of 550 nearby galaxies in the stellar mass range 109–1011.5 M⊙ with resolved spectroscopic data from the Sloan Digital Sky Survey IV Mapping Nearby Galaxies at Apache Point Observatory survey. Using strong-line ratio diagnostics (R23 and O3N2 for metallicity and N2O2 for N/O) and referencing to the effective (half-light) radius (Re), we find that the metallicity gradient steepens with stellar mass, lying roughly flat among galaxies with log (M⋆/M⊙) = 9.0 but exhibiting slopes as steep as −0.14 dex R−1eRe−1 at log (M⋆/M⊙) = 10.5 (using R23, but equivalent results are obtained using O3N2). At higher masses, these slopes remain typical in the outer regions of our sample (R > 1.5Re), but a flattening is observed in the central regions (R < 1Re). In the outer regions (R > 2.0Re), we detect a mild flattening of the metallicity gradient in stacked profiles, although with low significance. The N/O ratio gradient provides complementary constraints on the average chemical enrichment history. Unlike the oxygen abundance, the average N/O profiles do not flatten out in the central regions of massive galaxies. The metallicity and N/O profiles both depart significantly from an exponential form, suggesting a disconnect between chemical enrichment and stellar mass surface density on local scales. In the context of inside-out growth of discs, our findings suggest that central regions of massive galaxies today have evolved to an equilibrium metallicity, while the nitrogen abundance continues to increase as a consequence of delayed secondary nucleosynthetic production.",
keywords = "astro-ph.GA, RCUK, STFC, uploaded-in-3-months-elsewhere",
author = "Francesco Belfiore and Roberto Maiolino and Christy Tremonti and S{\'a}nchez, {Sebastian F.} and Kevin Bundy and Matthew Bershady and Kyle Westfall and Lihwai Lin and Niv Drory and M{\'e}d{\'e}ric Boquien and Daniel Thomas and Jonathan Brinkmann",
note = "accepted in MNRAS, no change from previous version",
year = "2017",
month = jul,
doi = "10.1093/mnras/stx789",
language = "English",
volume = "469",
pages = "151--170",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - SDSS IV MaNGA - metallicity and nitrogen abundance gradients in local galaxies

AU - Belfiore, Francesco

AU - Maiolino, Roberto

AU - Tremonti, Christy

AU - Sánchez, Sebastian F.

AU - Bundy, Kevin

AU - Bershady, Matthew

AU - Westfall, Kyle

AU - Lin, Lihwai

AU - Drory, Niv

AU - Boquien, Médéric

AU - Thomas, Daniel

AU - Brinkmann, Jonathan

N1 - accepted in MNRAS, no change from previous version

PY - 2017/7

Y1 - 2017/7

N2 - We study the gas phase metallicity (O/H) and nitrogen abundance gradients traced by star-forming regions in a representative sample of 550 nearby galaxies in the stellar mass range 109–1011.5 M⊙ with resolved spectroscopic data from the Sloan Digital Sky Survey IV Mapping Nearby Galaxies at Apache Point Observatory survey. Using strong-line ratio diagnostics (R23 and O3N2 for metallicity and N2O2 for N/O) and referencing to the effective (half-light) radius (Re), we find that the metallicity gradient steepens with stellar mass, lying roughly flat among galaxies with log (M⋆/M⊙) = 9.0 but exhibiting slopes as steep as −0.14 dex R−1eRe−1 at log (M⋆/M⊙) = 10.5 (using R23, but equivalent results are obtained using O3N2). At higher masses, these slopes remain typical in the outer regions of our sample (R > 1.5Re), but a flattening is observed in the central regions (R < 1Re). In the outer regions (R > 2.0Re), we detect a mild flattening of the metallicity gradient in stacked profiles, although with low significance. The N/O ratio gradient provides complementary constraints on the average chemical enrichment history. Unlike the oxygen abundance, the average N/O profiles do not flatten out in the central regions of massive galaxies. The metallicity and N/O profiles both depart significantly from an exponential form, suggesting a disconnect between chemical enrichment and stellar mass surface density on local scales. In the context of inside-out growth of discs, our findings suggest that central regions of massive galaxies today have evolved to an equilibrium metallicity, while the nitrogen abundance continues to increase as a consequence of delayed secondary nucleosynthetic production.

AB - We study the gas phase metallicity (O/H) and nitrogen abundance gradients traced by star-forming regions in a representative sample of 550 nearby galaxies in the stellar mass range 109–1011.5 M⊙ with resolved spectroscopic data from the Sloan Digital Sky Survey IV Mapping Nearby Galaxies at Apache Point Observatory survey. Using strong-line ratio diagnostics (R23 and O3N2 for metallicity and N2O2 for N/O) and referencing to the effective (half-light) radius (Re), we find that the metallicity gradient steepens with stellar mass, lying roughly flat among galaxies with log (M⋆/M⊙) = 9.0 but exhibiting slopes as steep as −0.14 dex R−1eRe−1 at log (M⋆/M⊙) = 10.5 (using R23, but equivalent results are obtained using O3N2). At higher masses, these slopes remain typical in the outer regions of our sample (R > 1.5Re), but a flattening is observed in the central regions (R < 1Re). In the outer regions (R > 2.0Re), we detect a mild flattening of the metallicity gradient in stacked profiles, although with low significance. The N/O ratio gradient provides complementary constraints on the average chemical enrichment history. Unlike the oxygen abundance, the average N/O profiles do not flatten out in the central regions of massive galaxies. The metallicity and N/O profiles both depart significantly from an exponential form, suggesting a disconnect between chemical enrichment and stellar mass surface density on local scales. In the context of inside-out growth of discs, our findings suggest that central regions of massive galaxies today have evolved to an equilibrium metallicity, while the nitrogen abundance continues to increase as a consequence of delayed secondary nucleosynthetic production.

KW - astro-ph.GA

KW - RCUK

KW - STFC

KW - uploaded-in-3-months-elsewhere

UR - https://www.repository.cam.ac.uk/handle/1810/265050

U2 - 10.1093/mnras/stx789

DO - 10.1093/mnras/stx789

M3 - Article

VL - 469

SP - 151

EP - 170

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 1

ER -

ID: 7503703