P-MaNGA Galaxies: emission-lines properties - gas ionization and chemical abundances from prototype observations
P-MaNGA Galaxies: emission-lines properties - gas ionization and chemical abundances from prototype observations
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DOI：
10.1093/mnras/stv296
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发表时间：
2014-10
影响因子：
4.8
通讯作者：
F. Belfiore;R. Maiolino;K. Bundy;D. Thomas;C. Maraston;D. Wilkinson;Sebastián F. Sánchez;M. Bershady;G. Blanc;M. Bothwell;S. Cales;L. Coccato;N. Drory;E. Emsellem;E. Emsellem;Hai Fu;Joseph Gelfand;Joseph Gelfand;D. Law;Karen L. Masters;J. Parejko;C. Tremonti;D. A. Wake;D. A. Wake;A. Weijmans;Renbin Yan;T. Xiao;Kai Zhang;T. Zheng;D. Bizyaev;K. Kinemuchi;D. Oravetz;A. Simmons
中科院分区：
文献类型：
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作者：
F. Belfiore;R. Maiolino;K. Bundy;D. Thomas;C. Maraston;D. Wilkinson;Sebastián F. Sánchez;M. Bershady;G. Blanc;M. Bothwell;S. Cales;L. Coccato;N. Drory;E. Emsellem;E. Emsellem;Hai Fu;Joseph Gelfand;Joseph Gelfand;D. Law;Karen L. Masters;J. Parejko;C. Tremonti;D. A. Wake;D. A. Wake;A. Weijmans;Renbin Yan;T. Xiao;Kai Zhang;T. Zheng;D. Bizyaev;K. Kinemuchi;D. Oravetz;A. Simmons
MANGA（Mapping Nearby Galerkin at Apache Point Observatory）是一项为期6年的斯隆数字巡天（SDSS-IV）调查，将获得超过10，000个附近星系的代表性样本的3600至10，300 A的空间分辨光谱。在本文中，我们提出的星云发射线的性质进行分析，使用的14个星系的观测与P-MaNGA，一个原型的MaNGA仪器。通过使用空间分辨的诊断图，我们发现扩展星星形成的星系，中心占主导地位的Seyfert/LINER类发射，这说明星系的特征基于单纤维光谱是不完整的。我们观察到扩展的低电离核发射线区域（LINER）的发射（高达1 Re）在三个星系的中心区域。我们利用Hα等效宽度[EW（Hα）]来论证观测到的辐射与热演化恒星的电离是一致的。我们推导出了恒星的星族指数，并证明了Dn（4000）和EW（HδA）与电离诊断图中位置之间的明显相关性：被Seyfert/LINER类辐射场电离的已分辨星系区也没有最近的星星形成，并且存在更老和/或更富金属的恒星星族。我们还发现在两个高度倾斜的星系面外LINER样发射，并确定它与弥漫的电离气体。我们调查了空间分辨的金属丰度，发现金属丰度和星星形成率表面密度之间存在正相关关系。我们进一步研究了N/O与O/H之间的关系，解决尺度。我们发现，在给定的N/O，个别星系内的区域向较低的金属丰度扩散，偏离由斯隆3弧秒纤维光谱跟踪的星系中心区域所定义的序列。我们认为，所观察到的分散体可以是一个示踪剂的气体流在星系中的原始气体和/或银河喷泉的效果的下落。
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 A 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.