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arXiv 0905.1946astro-ph.CO
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HDF 850.1的精确定位:哈勃深场北布里渊亚毫米波源

An Accurate Position for HDF 850.1: The Brightest Submillimeter Source in the Hubble Deep Field-North

L. L. Cowie, A. J. Barger, W. -H. Wang, J. P. Williams

摘要:

我们报告了一个非常重要的亚毫米波阵列(SMA)检测的原型亚毫米波源HDF 850.1,这是最明亮的亚毫米波源在哈勃深场北正确。该探测产生了非常精确的位置RA(2000)=12:36:51.99和Dec(2000)=+62:12:25.83,1-sigma位置不确定度为0.17 arcsec。该位置与毫米波长干涉检测的位置以及1.4和8.4 GHz处弱VLA检测的位置一致,但与任何先前的光学/近红外识别不一致。在SMA的2角秒分辨率下,源呈点状,探测到的7.8+/-1.0 mJy的通量与测量的SCUBA通量一致。我们将HDF 850.1在其他波长下的通量和限值制成表格。我们基于射电到中红外测量对HDF 850.1的红移估计是z=4.1。光源在可见光/近红外波长处的模糊性和估计的高红移表明HDF 850.1可能是更亮的亚毫米光源GOODS 850-5的模拟,后者也被认为是z>4。像HDF 850.1这样的源应该出现在有史以来最早的空白场SCUBA观测中,这一事实表明这种高红移源非常常见。因此,我们得出结论,高红移恒星的形成是由巨大的尘埃恒星形成星系主导的,就像在较低红移时一样。

英文摘要:

We report a highly significant Submillimeter Array (SMA) detection of the prototypical submillimeter source HDF 850.1, which is the brightest submillimeter source in the Hubble Deep Field-North proper. The detection yields an extremely precise position of RA(2000)=12:36:51.99 and Dec(2000)=+62:12:25.83 with a 1-sigma positional uncertainty of 0.17 arcsec. The position is consistent with the location of a millimeter wavelength interferometric detection and with the locations of weak VLA detections at 1.4 and 8.4 GHz, but it is not consistent with any previous optical/near-infrared identifications. The source appears pointlike at the 2 arcsec resolution of the SMA, and the detected flux of 7.8+/-1.0 mJy is consistent with the measured SCUBA fluxes. We tabulate fluxes and limits on HDF 850.1 at other wavelengths. Our redshift estimate for HDF 850.1 based on the radio through mid-infrared measurements is z=4.1. The faintness of the source at optical/near-infrared wavelengths and the high estimated redshift suggest that HDF 850.1 may be an analog of the brighter submillimeter source GOODS 850-5, which is also thought to be at z>4. The fact that a source like HDF 850.1 should have appeared in one of the very first blank-field SCUBA observations ever made suggests that such high-redshift sources are quite common. Thus, we are led to conclude that high-redshift star formation is dominated by giant dusty star-forming galaxies, just as it is at lower redshifts.

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