Submillimeter galaxies behind the Bullet Cluster (1E 0657-56)

Submillimeter galaxies behind the Bullet Cluster (1E 0657-56)
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子弹星团后面的亚毫米星系 (1E 0657-56)

DOI:
10.1051/0004-6361/200913833
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发表时间:
2010
影响因子:
6.5
通讯作者:
Johansson
Johansson
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Johansson

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背景星系团是一种有效的引力透镜,能够放大背景星系,并使探测星系群中较暗的部分成为可能。亚毫米星系被认为是典型红移为2到3的恒星形成星系,是星系团扩展的Sunyaev-Zeldovich(SZ)信号的主要污染物。为了正确量化SZ信号,需要量化亚毫米星系的贡献。目的本研究的目的是识别质量为0.3的子弹状星系团(1E-0657-56)的场中的亚毫米源,测量它们在870μm的通量密度,并寻找其他波长的对应物来限制它们的性质。方法我们利用阿塔卡马探路者实验望远镜上的大型APEX测辐射热计相机对870μm的亚毫米连续辐射进行了深入观测。使用多种数值方法对数据的噪声特性进行量化并提取来源。结果共发现17个来源。其中13个位于地图的中心10度角,像素灵敏度为1.2mJy/22‘’光束。经过通量提升和引力透镜的校正后,计数结果与已公布的亚毫米测量结果一致。其中9个源在斯皮策图中有红外对应。最强的亚毫米探测到的源与之前报道的其他波长的源相吻合,估计红移2.7。如果亚毫米通量来自两张总放大倍数为0.75的星系图像,如模型所示,其本征通量将约为0.6mJy,与低于1012的固有光度一致。
ContextClusters of galaxies are effective gravitational lenses able to magnify background galaxies and making it possible to probe the fainter part of the galaxy population. Submillimeter galaxies, which are believed to be star-forming galaxies at typical redshifts of 2 to 3, are a major contaminant to the extended Sunyaev-Zeldovich (SZ) signal of galaxy clusters. For a proper quantification of the SZ signal the contribution of submillimeter galaxies needs to be quantified.AimsThe aims of this study are to identify submillimeter sources in the field of the Bullet cluster (1E 0657-56), a massive cluster of galaxies atz0.3, measure their flux densities at 870μm, and search for counterparts at other wavelengths to constrain their properties.MethodsWe carried out deep observations of the submillimeter continuum emission at 870μm using the Large APEX BOlometer CAmera (LABOCA) on the Atacama Pathfinder EXperiment (APEX) telescope. Several numerical techniques were used to quantify the noise properties of the data and extract sources.ResultsIn total, seventeen sources were found. Thirteen of them lie in the central 10 arcmin of the map, which has a pixel sensitivity of 1.2 mJy per22''beam. After correction for flux boosting and gravitational lensing, the number counts are consistent with published submm measurements. Nine of the sources have infrared counterparts in Spitzer maps. The strongest submm detection coincides with a source previously reported at other wavelengths, at an estimated redshiftz2.7. If the submm flux arises from two images of a galaxy magnified by a total factor of 75, as models have suggested, its intrinsic flux would be around 0.6 mJy, consistent with an intrinsic luminosity below 1012.
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