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.
N1 - Publisher Copyright:
© 2015 The Authors.
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
UR - http://www.scopus.com/inward/record.url?scp=84930001068&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84930001068&partnerID=8YFLogxK
U2 - 10.1093/mnras/stv296
DO - 10.1093/mnras/stv296
M3 - Article
AN - SCOPUS:84930001068
SN - 0035-8711
VL - 449
SP - 867
EP - 900
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -