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arXiv 1502.05800astro-ph.GA
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邻近射电发光星系的红外色特性

Infrared colour properties of nearby radio-luminous galaxies

Xiao-hong Yang, Pei-sheng Chen, Yan Huang

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11 pages, 8 figures and 3 tables. Accepted for publication in MNRAS
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摘要：

利用2微米全天巡天、\textit{Wide Field Infrared Survey Explorer}和\textit{AKARI}卫星的观测资料，研究了2712个邻近射电发光星系（RLG）的红外色性质。这些RLG可分为射电噪（RL）活动星系核（AGN）和恒星形成主导的RLG（SFG），前者主要出现在$0.05<z<0.3$的红移处，后者主要出现在$0.01<z<0.15$的红移处。RL AGN和SFG分别分布在（[3.4] $-$ [4.6]）$-$（[4.6] $-$ [12]）双色图中，其中RL AGN显示双核分布，SFG显示单核分布。SFG的颜色比RL AGN更红[4.6] $-$ [12]，这是因为SFG中的尘埃成分有很大的贡献。我们找到了RL AGN和SFG之间MIR颜色分离的简单标准：95个$\%$的RL AGN具有[4.6] $-$ [12] $<$ 3.0，94个$\%$的SFG具有[4.6] $-$ [12] $>$ 3.0。我们还分析了分为低和高激发射电星系（LERG和HERG，分别）RL活动星系核的MIR颜色。（[3.4] $-$ [4.6]）$-$（[4.6] $-$ [12]）图清楚地显示了LERG和HERG的单独分布以及重叠区域，这表明LERG和HERG具有不同的MIR特性。在（[3.4] $-$ [4.6]）$-$（[4.6] $-$ [12]）图上，LERG负责RL活动星系核的双核分布。此外，我们还建议将90 $-$ 140 $μ$ m波段光谱指数$α(90,140)<-1.4$作为选择附近具有远红外非热发射的活动星系的标准。

英文摘要：

By combining the data of the Two Micron All Sky Survey, the \textit{Wide Field Infrared Survey Explorer} and the \textit{AKARI} satellite, we study the infrared colour properties of a sample of 2712 nearby radio-luminous galaxies (RLGs). These RLGs are divided into radio-loud (RL) active galactic nuclei (AGNs), mainly occurring at redshifts of $0.05<z<0.3$ and star-forming-dominated RLGs (SFGs), mainly occurring at redshifts of $0.01<z<0.15$. RL AGNs and SFGs are separately distributed in the ([3.4]$-$[4.6])$-$([4.6]$-$[12]) two-colour diagram, in which the RL AGNs display a double-core distribution, and the SFGs display a single-core distribution. SFGs have a redder [4.6]$-$[12] colour than RL AGNs due to the significant contribution from the dust component of SFGs. We find simple criteria of MIR colour separation between RL AGNs and SFGs such that: 95$\%$ of RL AGNs have [4.6]$-$[12] $<$ 3.0 and 94$\%$ of SFGs have [4.6]$-$[12] $>$ 3.0. We also analyse the MIR colours of RL AGNs divided into low- and high-excitation radio galaxies (LERGs and HERGs, respectively). The ([3.4]$-$[4.6])$-$([4.6]$-$[12]) diagram clearly shows separate distributions of LERGs and HERGs and a region of overlap, which suggests that LERGs and HERGs have different MIR properties. LERGs are responsible for the double-core distribution of RL AGNs on the ([3.4]$-$[4.6])$-$([4.6]$-$[12]) diagram. In addition, we also suggest 90$-$140$μ$m band spectral index $α(90,140)<-1.4$ as a criterion of selecting nearby active galaxies with non-thermal emissions at far-infrared wavelengths.

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