基于Spitzer数据的羟基脉泽寄主星系的中红外特性研究  

The Spitzer middle infrared properties of OH maser host galaxies

作　　者：王金[1] 汪友鑫 张江水[1] 林如秋 吕不悔 林耀华 卓仕然 刘筱燕[1] 徐丽琴[1] WANG Jin;WANG You-xin;ZHANG Jiang-shui;LIN Ru-qiu;L YU LIN Yao-hua;ZHUO Shi-ran;LIU Xiao-yan;XU Li-qin(School of Physics ＆ Electronic Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学物理与电子工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2018年第4期30-40,共11页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11473007;11590782)

摘　　要：目前发现羟基脉泽的星系都为亮或极亮的红外星系,但在许多(极)亮红外星系中并未探测到羟基脉泽辐射,这可能意味着羟基脉泽寄主(极)亮红外星系具有某些独特的特性.文章利用Spitzer红外卫星的测光数据,研究羟基脉泽寄主星系的中红外特性.通过统计对比分析羟基脉泽寄主星系和非羟基脉泽寄主星系(即未探测到羟基脉泽辐射的星系)在3. 6μm、4. 5μm、5. 8μm、8μm和24μm波段的辐射光度和谱指数、中红外能谱分布,及其与羟基脉泽光度的关系,结果发现:(1)非羟基脉泽样本的3. 6μm辐射光度明显大于羟基脉泽样本;(2)羟基脉泽样本的谱指数较大,能谱分布的对比显示羟基脉泽的光谱更陡(8μm～24μm);(3)羟基脉泽光度与中红外24μm的光度存在较弱的正相关(R～0. 36),间接支持羟基脉泽辐射的远红外辐射抽运机制.To date, the OH masers host galaxies are mostly luminous （LIRGs） or uhra-luminous infrared galax- ies （ULIRGs）. However, OH masers are not detected in all of （U）LIRGS, which indicate that the OH masers host galaxies should have some kinds of intrinsic property. In this paper, we investigate the middle infrared （MIR） properties of OH masers host galaxies by using the Spitzer photometric data at 3.6 μm, 4.5 μm, 5.8 μm, 8 μm and 24 μm. Through statistic and comparative analysis on the MIR luminosity at each band, spectral indices and the spectral energy distribution for OH masers and non-OH maser sample （without detection of OH maser emission） , and the relationship between the MIR luminosity and the maser luminosity, we find that ： 1 ） non-OH masers tend to have larger luminosity than OH masers at 3.6 μm band; 2） OH masers have lager spectral indices and steeper MIR spectral （8 μm -24 μm） than non-OH masers; 3） the marginal corgiation （R - 0.36） of the 24 μm MIR luminosity and the maser luminosity may support indirectly the conclusion that the OH maser emission is pumped by Far infrared radiation.

关 键 词：羟基脉泽 星系 中红外 Spizter 

分 类 号：O412.1[理学—理论物理]