P-MaNGA Galaxies: emission-lines properties – gas ionization and chemical abundances from prototype observations
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Blanc Mendiberri, Guillermo
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P-MaNGA Galaxies: emission-lines properties – gas ionization and chemical abundances from prototype observations
Author
- Blanc Mendiberri, Guillermo;
- Belfiore, F.;
- Maiolino, R.;
- Bundy, K.;
- Thomas, D.;
- Maraston, C.;
- Wilkinson, D.;
- Sanchez, S. F.;
- Bershady, M.;
- Bothwell, M.;
- Cales, S. L.;
- 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.;
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 Å 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.
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Artículo de publicación ISI
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MNRAS 449, 867–900 (2015)
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