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首页> 外文期刊>The Astrophysical Journal. Letters >Detection of an ultra-bright submillimeter galaxy behind the Small Magellanic Cloud
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Detection of an ultra-bright submillimeter galaxy behind the Small Magellanic Cloud

机译:麦哲伦星云背后超亮亚毫米星系的探测

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摘要

We report the discovery of a new ultra-bright submillimeter galaxy (SMG) behind the Small Magellanic Cloud (SMC). This SMG is detected as a 43.3 ± 8.4 mJy point source (MM J01071-7302, hereafter MMJ0107) in the 1.1 mm continuum survey of the SMC by AzTEC on the ASTE telescope. MMJ0107 is also detected in the radio (843 MHz), Herschel/SPIRE, Spitzer MIPS 24 μm, all IRAC bands, Wide-field Infrared Survey Explorer, and near-infrared (J, H, K _S). We find an optical (U, B, V) source, which might be the lensing object, at a distance of 1.″4 from near-infrared and IRAC sources. Photometric redshift estimates for the SMG using representative spectral energy distribution templates show the redshifts of 1.4-3.9. We estimate total far-infrared luminosity of (0.3-2.2) × 10~(14) μ~(-1) L⊙ and a star formation rate of 5600-39, 000 μ~(-1) M⊙ yr~(-1), where μ is the gravitational magnification factor. This apparent extreme star formation activity is likely explained by a highly magnified gravitational lens system.
机译:我们报告了在小麦哲伦星云(SMC)之后发现了一个新的超亮亚毫米星系(SMG)。在ASTE望远镜的AzTEC对SMC进行的1.1 mm连续测量中,此SMG被检测为43.3±8.4 mJy点源(MM J01071-7302,以下称为MMJ0107)。在无线电(843 MHz),Herschel / SPIRE,Spitzer MIPS 24μm,所有IRAC频段,宽视野红外测量浏览器和近红外(J,H,K _S)中也检测到MMJ0107。我们发现一个光学(U,B,V)光源(可能是镜头物体)与近红外光源和IRAC光源的距离为1。''4。使用代表性的光谱能量分布模板对SMG进行的光度红移估计显示出1.4-3.9的红移。我们估计(0.3-2.2)×10〜(14)μ〜(-1)L⊙的总远红外发光度和5600-39、000μ〜(-1)M⊙yr〜(- 1),其中μ是重力放大系数。这种明显的极端恒星形成活动可能是由高度放大的引力透镜系统解释的。

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