The SCUBA HAlf Degree Extragalactic Survey - VI. 350-µm mapping of submillimetre galaxies
The SCUBA HAlf Degree Extragalactic Survey - VI. 350-µm mapping of submillimetre galaxies
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水肺半度河外巡天 - VI。
DOI：
10.1111/j.1365-2966.2007.12808.x
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发表时间：
2008
影响因子：
4.8
通讯作者：
Coppin K
中科院分区：
文献类型：
--
作者：
Coppin K
使用350微米的亚毫米高角分辨率照相机进行了后续测量，以绘制从亚毫米半度河外巡天中选定的几个850微米源周围的区域。这些观测探测了红外（IR）光度，从而探测了现有最大、最强大的亚毫米星系（SMG）样本中的星星形成率。我们测量了24个850 μm源的350 μm通量密度，其中7个在850 μm位置的10弧秒搜索半径内以≥2.5σ被探测到。当包括来自文献的结果时，SHADES SMG的350 μm通量密度约束的总数为31个，其中15个检测。我们将一个修正的黑体拟合到每个SMG的远红外（FIR）测光中，并确认典型的SMG是富含尘埃（M尘埃<$9 × 108 M <$m）、发光（LFIR <$2 × 1012 L <$m）的恒星形成星系，其内部尘埃温度为35 K，星星形成速率为400 M <$yr−1。我们已经测量了SMG的温度分布，发现基本分布比误差条所暗示的略宽，大多数SMG的温度为28 K，少数更热。我们还对350 μm源计数设置了新的限制，N350（>25 mJy）<$200 -500 deg−2。
A follow-up survey using the Submillimetre High-Angular Resolution Camera (SHARC-II) at 350 μm has been carried out to map the regions around several 850-μm-selected sources from the Submillimetre HAlf Degree Extragalactic Survey (SHADES). These observations probe the infrared (IR) luminosities and hence star formation rates in the largest existing, most robust sample of submillimetre galaxies (SMGs). We measure 350-μm flux densities for 24 850-μm sources, seven of which are detected at ≥2.5σ within a 10 arcsec search radius of the 850-μm positions. When results from the literature are included the total number of 350-μm flux density constraints of SHADES SMGs is 31, with 15 detections. We fit a modified blackbody to the far-IR (FIR) photometry of each SMG, and confirm that typical SMGs are dust-rich (Mdust≃ 9 × 108M⊙), luminous (LFIR≃ 2 × 1012L⊙) star-forming galaxies with intrinsic dust temperatures of ≃35 K and star formation rates of ≃400 M⊙yr−1. We have measured the temperature distribution of SMGs and find that the underlying distribution is slightly broader than implied by the error bars, and that most SMGs are at 28 K with a few hotter. We also place new constraints on the 350-μm source counts,N350(>25 mJy) ∼ 200–500 deg−2.