A deep look at the nuclear region of UGC 5101 through high angular resolution mid-IR data with GTC/CanariCam
A deep look at the nuclear region of UGC 5101 through high angular resolution mid-IR data with GTC/CanariCam
复制标题
使用 GTC/CanariCam 通过高角分辨率中红外数据深入观察 UGC 5101 的核区域
DOI：
10.1093/mnras/stv2134
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发表时间：
2015
影响因子：
4.8
通讯作者：
M.; Levenso
中科院分区：
文献类型：
--
作者：
Martinez-Paredes;M.; Alonso-Herrero;A.; Aretxaga;I.; Ramos Almeida;C.; Hernan-Caballero;A.; Gonzalez-Martin;O.; Pereira-Santaella;M.; Packham;C.; Asensio Ramos;A.; Diaz-Santos;T.;Elitzur;M.; Esquej;P.; Garcia-Bernete;I.; Imanishi;M.; Levenso
本文通过对超亮红外星系UGC 5101的核红外（IR，1.6-18 μm）辐射的分析，讨论了其活动星系核（AGN）及其遮蔽物质的性质。我们使用新的中红外高角分辨率（0.3-0.5 arcsec）成像，使用Si-2滤波器（λC= 8.7 μm）和7.5-13 μm光谱与CanariCam（CC）在10.4 m Gran Telescopio CANARIAS上拍摄。我们还使用档案哈勃太空望远镜/NICMOS和斯巴鲁/COMICS成像和斯皮策/IRS光谱。我们估计近红外和中红外未分辨的核发射建模的成像数据与galfit。我们分解theSpitzer/IRS和CC光谱使用幂律分量，这代表了由于尘埃加热AGN的排放量，和星爆分量，都受到前景消光。我们的模型产生的未解决的近红外和中红外，和星爆减去CC光谱与CLUMPY环面模型Nenkova等人。导出的环面的几何性质，包括大的覆盖因子和高的前景消光，需要复制深9.7 μm的硅酸盐特征，是一致的，在光学上缺乏强AGN的签名。我们得到了活动星系核的辐射热光度Lbol = 1.9 × 1045 erg s− 1，这与文献中的其他估计值吻合得很好。
We present an analysis of the nuclear infrared (IR, 1.6–18 μm) emission of the ultraluminous IR galaxy UGC 5101 to derive the properties of its active galactic nucleus (AGN) and its obscuring material. We use new mid-IR high angular resolution (0.3–0.5 arcsec) imaging using the Si-2 filter (λC= 8.7 μm) and 7.5–13 μm spectroscopy taken with CanariCam (CC) on the 10.4 m Gran Telescopio CANARIAS. We also use archivalHubble Space Telescope/NICMOS and Subaru/COMICS imaging andSpitzer/IRS spectroscopy. We estimate the near- and mid-IR unresolved nuclear emission by modelling the imaging data withgalfit. We decompose theSpitzer/IRS and CC spectra using a power-law component, which represents the emission due to dust heated by the AGN, and a starburst component, both affected by foreground extinction. We model the resulting unresolved near- and mid-IR, and the starburst subtracted CC spectrum with the CLUMPY torus models of Nenkova et al. The derived geometrical properties of the torus, including the large covering factor and the high foreground extinction needed to reproduce the deep 9.7 μm silicate feature, are consistent with the lack of strong AGN signatures in the optical. We derive an AGN bolometric luminosityLbol∼ 1.9 × 1045erg s−1that is in good agreement with other estimates in the literature.