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Dust Properties of Local Dust-Obscured Galaxies with the Submillimeter Array

机译:亚毫米波局部尘埃星系的尘埃特性   排列

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摘要

We report Submillimeter Array (SMA) observations of the 880 \mu m dustcontinuum emission for four dust-obscured galaxies (DOGs) in the localuniverse. Two DOGs are clearly detected with S_\nu(880 \mu m)=10-13 mJy andS/N>5, but the other two are not detected with 3{\sigma} upper limits ofS_\nu(880 \mu m)=5-9 mJy. Including an additional two local DOGs withsubmillimeter data from the literature, we determine the dust masses andtemperatures for six local DOGs. The infrared luminosities and dust masses forthese DOGs are in the range 1.2-4.9x10^{11} (L_sun) and 4-14x10^{7} (M_sun),respectively. The dust temperatures derived from a two-component modifiedblackbody function are 23-26 K and 60-124 K for the cold and warm dustcomponents, respectively. Comparison of local DOGs with other infrared luminousgalaxies with submillimeter detections shows that the dust temperatures andmasses do not differ significantly among these objects. Thus, as arguedpreviously, local DOGs are not a distinctive population among dusty galaxies,but simply represent the high-end tail of the dust obscuration distribution.
机译:我们报告了局部宇宙中四个尘埃模糊星系(DOG)880微米尘埃连续谱发射的亚毫米波阵列(SMA)观测结果。可以清楚地检测到两个S_ \ nu(880 \μm)= 10-13 mJy和S / N> 5的DOG,但是其他两个DOG的S_ \ nu(880 \μm)上限为3 {\ sigma}时,则无法检测到。 = 5-9兆焦耳。包括另外两个带有文献中亚毫米数据的本地DOG,我们确定了六个本地DOG的粉尘质量和温度。 DOG的红外光度和粉尘质量分别在1.2-4.9x10 ^ {11}(L_sun)和4-14x10 ^ {7}(M_sun)范围内。从两个成分的修正黑体函数得出的粉尘温度,冷和热粉尘成分分别为23-26 K和60-124K。通过亚毫米波检测将本地DOG与其他红外发光星系进行比较后发现,这些物体之间的粉尘温度和质量没有显着差异。因此,如前所述,本地DOG并不是尘土飞扬的星系中的独特种群,而只是代表尘埃模糊分布的高端尾巴。

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