%0 Generic %1 belfiore2014pmanga %A Belfiore, F. %A Maiolino, R. %A Bundy, K. %A Thomas, D. %A Maraston, C. %A Wilkinson, D. %A Sánchez, S. F. %A Bershady, M. %A Blanc, G. A. %A Bothwell, M. %A Cales, S. L. %A Coccato, L. %A Drory, N. %A Emsellem, E. %A Fu, H. %A Gelfand, J. %A Law, D. %A Masters, K. %A Parejko, J. %A Tremonti, C. %A Wake, D. %A Weijmans, A. %A Yan, R. %A Xiao, T. %A Zhang, K. %A Zheng, T. %A Bizyaev, D. %A Kinemuchi, K. %A Oravetz, D. %A Simmons, A. %D 2014 %K emission ifu lines %T P-MaNGA Galaxies: Emission Lines Properties - Gas Ionisation and Chemical Abundances from Prototype Observations %U http://arxiv.org/abs/1410.7781 %X MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a SDSS-IV survey that will obtain spatially resolved spectroscopy from 3600 \AA\ to 10300 \AA\ for a representative sample of over 10000 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, illustrating that galaxy characterisations based on single fibre spectra are necessarily incomplete. We observe extended (up to $1 R_e$) LINER-like emission in the central regions of three galaxies. We make use of the $EW(H \alpha)$ to argue that the observed emission is consistent with ionisation from hot evolved stars. Using stellar population indices we conclude that galactic regions which are ionised by a Seyfert/LINER-like radiation field are also devoid of recent star formation, presenting older and/or more metal rich stellar populations. We find that low mass galaxies show a positive correlation between metallicity and star formation rate (SFR) surface density, as in less massive systems both metallicity and SFR are highest in galaxy centres. In more massive galaxies we observe a weakening of this correlation, because the central regions are devoid of recent star formation. We further study the relation between N/O vs O/H on resolved scales. We find that regions within individual galaxies, at given N/O, are spread towards lower metallicities, deviating from the sequence defined by galactic central regions, as traced by Sloan 3'' fibre spectra. We suggest that the observed dispersion can be interpreted as tracing gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.

@misc{belfiore2014pmanga, abstract = {MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) is a SDSS-IV survey that will obtain spatially resolved spectroscopy from 3600 \AA\ to 10300 \AA\ for a representative sample of over 10000 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, illustrating that galaxy characterisations based on single fibre spectra are necessarily incomplete. We observe extended (up to $\rm 1 R_{e}$) LINER-like emission in the central regions of three galaxies. We make use of the $\rm EW(H \alpha)$ to argue that the observed emission is consistent with ionisation from hot evolved stars. Using stellar population indices we conclude that galactic regions which are ionised by a Seyfert/LINER-like radiation field are also devoid of recent star formation, presenting older and/or more metal rich stellar populations. We find that low mass galaxies show a positive correlation between metallicity and star formation rate (SFR) surface density, as in less massive systems both metallicity and SFR are highest in galaxy centres. In more massive galaxies we observe a weakening of this correlation, because the central regions are devoid of recent star formation. We further study the relation between N/O vs O/H on resolved scales. We find that regions within individual galaxies, at given N/O, are spread towards lower metallicities, deviating from the sequence defined by galactic central regions, as traced by Sloan 3'' fibre spectra. We suggest that the observed dispersion can be interpreted as tracing gas flows in galaxies: infalls of pristine gas and/or the effect of a galactic fountain.}, added-at = {2014-10-30T09:48:37.000+0100}, author = {Belfiore, F. and Maiolino, R. and Bundy, K. and Thomas, D. and Maraston, C. and Wilkinson, D. and Sánchez, S. F. and Bershady, M. and Blanc, G. A. and Bothwell, M. and Cales, S. L. and Coccato, L. and Drory, N. and Emsellem, E. and Fu, H. and Gelfand, J. and Law, D. and Masters, K. and Parejko, J. and Tremonti, C. and Wake, D. and Weijmans, A. and Yan, R. and Xiao, T. and Zhang, K. and Zheng, T. and Bizyaev, D. and Kinemuchi, K. and Oravetz, D. and Simmons, A.}, biburl = {https://www.bibsonomy.org/bibtex/23d24bd3498155eb0ac51afedb10ba263/miki}, description = {[1410.7781] P-MaNGA Galaxies: Emission Lines Properties - Gas Ionisation and Chemical Abundances from Prototype Observations}, interhash = {9eb26fd84847a1ff32ef0495979c5808}, intrahash = {3d24bd3498155eb0ac51afedb10ba263}, keywords = {emission ifu lines}, note = {cite arxiv:1410.7781Comment: 37 pages, 28 figures, resubmitted to MNRAS after addressing the referee report}, timestamp = {2014-10-30T09:48:37.000+0100}, title = {P-MaNGA Galaxies: Emission Lines Properties - Gas Ionisation and Chemical Abundances from Prototype Observations}, url = {http://arxiv.org/abs/1410.7781}, year = 2014 }