P-MaNGA galaxies : emission-lines properties – gas ionization and chemical abundances from prototype observations
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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.
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 , 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 . DOI: 10.1093/mnras/stv296
Monthly Notices of the Royal Astronomical Society
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record: Belfiore F, Maiolino R, Bundy K, Thomas D, Maraston C, Wilkinson D et al. P-MaNGA galaxies: emission-lines properties – gas ionization and chemical abundances from prototype observations. Monthly Notices of the Royal Astronomical Society. 2015 May 1;449(1):867-900, is available online at: mnras.oxfordjournals.org/content/449/1/867.full
This work was supported by the STFC, UK and World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan.
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