P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations

F. Belfiore; R. Maiolino; K. Bundy; D. Thomas; C. Maraston; D. Wilkinson; S. F. Sánchez; M. Bershady; G. A. Blanc; M. Bothwell; S. L. Cales; L. Coccato; N. Drory; E. Emsellem; H. Fu; J. Gelfand; D. Law; K. Masters; J. Parejko; C. Tremonti; D. Wake; A. Weijmans; R. Yan; T. Xiao; K. Zhang; T. Zheng; D. Bizyaev; K. Kinemuchi; D. Oravetz; A. Simmons

doi:10.1093/mnras/stv296

P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations

F. Belfiore, R. Maiolino, K. Bundy, D. Thomas, C. Maraston, D. Wilkinson, S. F. Sánchez, M. Bershady, G. A. Blanc, M. Bothwell, S. L. Cales, L. Coccato, N. Drory, E. Emsellem, H. Fu, J. Gelfand, D. Law, K. Masters, J. Parejko, C. TremontiD. Wake, A. Weijmans, R. Yan, T. Xiao, K. Zhang, T. Zheng, D. Bizyaev, K. Kinemuchi, D. Oravetz, A. Simmons

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a 6-yr Sloan Digital Sky Survey (SDSS-IV) survey that will obtain spatially resolved spectroscopy from 3600 to 10 300Å for a representative sample of over 10 000 nearby galaxies. In this paper, we present the analysis of nebular emission-line properties using observations of 14 galaxies obtained with P-MaNGA, a prototype of the MaNGA instrument. By using spatially resolved diagnostic diagrams, we find extended star formation in galaxies that are centrally dominated by Seyfert/LINER-like emission, which illustrates that galaxy characterizations based on single fibre spectra are necessarily incomplete. We observe extended low ionization nuclear emission-line regions (LINER)-like emission (up to 1R_e) in the central regions of three galaxies. We make use of the Hα equivalent width [EW(Hα)] to argue that the observed emission is consistent with ionization from hot evolved stars. We derive stellar population indices and demonstrate a clear correlation between D_n(4000) and EW(Hδ_A) and the position in the ionization diagnostic diagram: resolved galactic regions which are ionized by a Seyfert/LINER-like radiation field are also devoid of recent star formation and host older and/or more metal-rich stellar populations. We also detect extraplanar LINER-like emission in two highly inclined galaxies, and identify it with diffuse ionized gas. We investigate spatially resolved metallicities and find a positive correlation between metallicity and star formation rate surface density. We further study the relation between N/O versus O/H on resolved scales. We find that, at given N/O, regions within individual galaxies are spread towards lower metallicities, deviating from the sequence defined by galactic central regions as traced by Sloan 3-arcsec fibre spectra. We suggest that the observed dispersion can be a tracer for gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.

Original language	English (US)
Pages (from-to)	867-900
Number of pages	34
Journal	Monthly Notices of the Royal Astronomical Society
Volume	449
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stv296
State	Published - Feb 23 2015

Keywords

Galaxies: ISM
Galaxies: abundances
Galaxies: active
Galaxies: evolution
Galaxies: fundamental parameters

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stv296

Cite this

Belfiore, F., Maiolino, R., Bundy, K., Thomas, D., Maraston, C., Wilkinson, D., Sánchez, S. F., Bershady, M., Blanc, G. A., Bothwell, M., Cales, S. L., Coccato, L., Drory, N., Emsellem, E., Fu, H., Gelfand, J., Law, D., Masters, K., Parejko, J., ... Simmons, A. (2015). P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations. Monthly Notices of the Royal Astronomical Society, 449(1), 867-900. https://doi.org/10.1093/mnras/stv296

Belfiore, F, Maiolino, R, Bundy, K, Thomas, D, Maraston, C, Wilkinson, D, Sánchez, SF, Bershady, M, Blanc, GA, Bothwell, M, Cales, SL, Coccato, L, Drory, N, Emsellem, E, Fu, H, Gelfand, J, Law, D, Masters, K, Parejko, J, Tremonti, C, Wake, D, Weijmans, A, Yan, R, Xiao, T, Zhang, K, Zheng, T, Bizyaev, D, Kinemuchi, K, Oravetz, D & Simmons, A 2015, 'P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations', Monthly Notices of the Royal Astronomical Society, vol. 449, no. 1, pp. 867-900. https://doi.org/10.1093/mnras/stv296

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title = "P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations",

abstract = "MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a 6-yr Sloan Digital Sky Survey (SDSS-IV) survey that will obtain spatially resolved spectroscopy from 3600 to 10 300{\AA} for a representative sample of over 10 000 nearby galaxies. In this paper, we present the analysis of nebular emission-line properties using observations of 14 galaxies obtained with P-MaNGA, a prototype of the MaNGA instrument. By using spatially resolved diagnostic diagrams, we find extended star formation in galaxies that are centrally dominated by Seyfert/LINER-like emission, which illustrates that galaxy characterizations based on single fibre spectra are necessarily incomplete. We observe extended low ionization nuclear emission-line regions (LINER)-like emission (up to 1Re) in the central regions of three galaxies. We make use of the Hα equivalent width [EW(Hα)] to argue that the observed emission is consistent with ionization from hot evolved stars. We derive stellar population indices and demonstrate a clear correlation between Dn(4000) and EW(HδA) and the position in the ionization diagnostic diagram: resolved galactic regions which are ionized by a Seyfert/LINER-like radiation field are also devoid of recent star formation and host older and/or more metal-rich stellar populations. We also detect extraplanar LINER-like emission in two highly inclined galaxies, and identify it with diffuse ionized gas. We investigate spatially resolved metallicities and find a positive correlation between metallicity and star formation rate surface density. We further study the relation between N/O versus O/H on resolved scales. We find that, at given N/O, regions within individual galaxies are spread towards lower metallicities, deviating from the sequence defined by galactic central regions as traced by Sloan 3-arcsec fibre spectra. We suggest that the observed dispersion can be a tracer for gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.",

keywords = "Galaxies: ISM, Galaxies: abundances, Galaxies: active, Galaxies: evolution, Galaxies: fundamental parameters",

author = "F. Belfiore and R. Maiolino and K. Bundy and D. Thomas and C. Maraston and D. Wilkinson and S{\'a}nchez, {S. F.} and M. Bershady and Blanc, {G. A.} and M. Bothwell and Cales, {S. L.} and L. Coccato and N. Drory and E. Emsellem and H. Fu and J. Gelfand and D. Law and K. Masters and J. Parejko and C. Tremonti and D. Wake and A. Weijmans and R. Yan and T. Xiao and K. Zhang and T. Zheng and D. Bizyaev and K. Kinemuchi and D. Oravetz and A. Simmons",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",

year = "2015",

month = feb,

day = "23",

doi = "10.1093/mnras/stv296",

language = "English (US)",

volume = "449",

pages = "867--900",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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TY - JOUR

T1 - P-MaNGA Galaxies

T2 - Emission-lines properties - gas ionization and chemical abundances from prototype observations

AU - Belfiore, F.

AU - Maiolino, R.

AU - Bundy, K.

AU - Thomas, D.

AU - Maraston, C.

AU - Wilkinson, D.

AU - Sánchez, S. F.

AU - Bershady, M.

AU - Blanc, G. A.

AU - Bothwell, M.

AU - Cales, S. L.

AU - Coccato, L.

AU - Drory, N.

AU - Emsellem, E.

AU - Fu, H.

AU - Gelfand, J.

AU - Law, D.

AU - Masters, K.

AU - Parejko, J.

AU - Tremonti, C.

AU - Wake, D.

AU - Weijmans, A.

AU - Yan, R.

AU - Xiao, T.

AU - Zhang, K.

AU - Zheng, T.

AU - Bizyaev, D.

AU - Kinemuchi, K.

AU - Oravetz, D.

AU - Simmons, A.

PY - 2015/2/23

Y1 - 2015/2/23

N2 - MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a 6-yr Sloan Digital Sky Survey (SDSS-IV) survey that will obtain spatially resolved spectroscopy from 3600 to 10 300Å for a representative sample of over 10 000 nearby galaxies. In this paper, we present the analysis of nebular emission-line properties using observations of 14 galaxies obtained with P-MaNGA, a prototype of the MaNGA instrument. By using spatially resolved diagnostic diagrams, we find extended star formation in galaxies that are centrally dominated by Seyfert/LINER-like emission, which illustrates that galaxy characterizations based on single fibre spectra are necessarily incomplete. We observe extended low ionization nuclear emission-line regions (LINER)-like emission (up to 1Re) in the central regions of three galaxies. We make use of the Hα equivalent width [EW(Hα)] to argue that the observed emission is consistent with ionization from hot evolved stars. We derive stellar population indices and demonstrate a clear correlation between Dn(4000) and EW(HδA) and the position in the ionization diagnostic diagram: resolved galactic regions which are ionized by a Seyfert/LINER-like radiation field are also devoid of recent star formation and host older and/or more metal-rich stellar populations. We also detect extraplanar LINER-like emission in two highly inclined galaxies, and identify it with diffuse ionized gas. We investigate spatially resolved metallicities and find a positive correlation between metallicity and star formation rate surface density. We further study the relation between N/O versus O/H on resolved scales. We find that, at given N/O, regions within individual galaxies are spread towards lower metallicities, deviating from the sequence defined by galactic central regions as traced by Sloan 3-arcsec fibre spectra. We suggest that the observed dispersion can be a tracer for gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.

AB - MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a 6-yr Sloan Digital Sky Survey (SDSS-IV) survey that will obtain spatially resolved spectroscopy from 3600 to 10 300Å for a representative sample of over 10 000 nearby galaxies. In this paper, we present the analysis of nebular emission-line properties using observations of 14 galaxies obtained with P-MaNGA, a prototype of the MaNGA instrument. By using spatially resolved diagnostic diagrams, we find extended star formation in galaxies that are centrally dominated by Seyfert/LINER-like emission, which illustrates that galaxy characterizations based on single fibre spectra are necessarily incomplete. We observe extended low ionization nuclear emission-line regions (LINER)-like emission (up to 1Re) in the central regions of three galaxies. We make use of the Hα equivalent width [EW(Hα)] to argue that the observed emission is consistent with ionization from hot evolved stars. We derive stellar population indices and demonstrate a clear correlation between Dn(4000) and EW(HδA) and the position in the ionization diagnostic diagram: resolved galactic regions which are ionized by a Seyfert/LINER-like radiation field are also devoid of recent star formation and host older and/or more metal-rich stellar populations. We also detect extraplanar LINER-like emission in two highly inclined galaxies, and identify it with diffuse ionized gas. We investigate spatially resolved metallicities and find a positive correlation between metallicity and star formation rate surface density. We further study the relation between N/O versus O/H on resolved scales. We find that, at given N/O, regions within individual galaxies are spread towards lower metallicities, deviating from the sequence defined by galactic central regions as traced by Sloan 3-arcsec fibre spectra. We suggest that the observed dispersion can be a tracer for gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.

KW - Galaxies: ISM

KW - Galaxies: abundances

KW - Galaxies: active

KW - Galaxies: evolution

KW - Galaxies: fundamental parameters

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U2 - 10.1093/mnras/stv296

DO - 10.1093/mnras/stv296

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SN - 0035-8711

VL - 449

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EP - 900

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

P-MaNGA Galaxies: Emission-lines properties - gas ionization and chemical abundances from prototype observations

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Keywords

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