The Properties of Microjansky Radio Sources in the Hubble Deep Field-North, SSA 13, and SSA 22 Fields
The Properties of Microjansky Radio Sources in the Hubble Deep Field-North, SSA 13, and SSA 22 Fields
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哈勃深场北区、SSA 13 和 SSA 22 场中 Microjansky 射电源的特性
DOI：
10.1086/345980
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Min S. Yun
中科院分区：
文献类型：
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作者：
S. Chapman;A. Barger;A. Barger;L. Cowie;D. Scott;C. Borys;P. Capak;E. Fomalont;G. F. Lewis;E. Richards;A. Steffen;Gillian Wilson;Min S. Yun
我们提出了一个大样本的microjansky无线电源检测超深1.4 GHz的地图集中在哈勃深场北（HDF-N）和夏威夷调查领域SSA 13和SSA 22的多波长观测。我们对169个射电源的光谱红移揭示了一个平坦的中值红移分布，这些源都是由类似发光的光学L* 星系托管的，不管红移如何。我们认为，在低红移，没有选择效应，低光学光度星系的情况下，是由于小星系不能有效地保留所需的宇宙射线主机microjansky无线电源。从我们对278个射电源的亚毫米测量中，我们发现总样本的误差加权平均850 μm通量为1.72 ± 0.09 mJy，光学暗（I > 23.5）子样本的误差加权平均850 μ m通量为2.37 ± 0.13 mJy，光学亮（I < 23.5）子样本的误差加权平均850 μ m通量为1.04 ± 0.13 mJy。我们显著地（>3 σ）探测到亚毫米50的射电源，38具有I > 23.5。三个I < 23.5的亚毫米波射电源的光谱红移在z = 1.0-3.4的范围内，并且都显示出活动星系核（AGN）的特征。仅使用亚毫米波映射区域，我们发现69% ± 9%的亚毫米波探测到的射电总体处于I > 23.5。在S850 μm > 5 mJy（>4 σ）的源中，有66% ± 7%的源是射电可识别的。我们使用我们的光谱样本来确定无线电功率红移的演变，从而确定远红外（FIR）光度（通过本地FIR无线电相关）。我们发现，毫米红移估计在低红移最好的FIR之间的银河系型星系和星暴星系的模板，和那些在高红移与阿普220模板的模板。
We present multiwavelength observations for a large sample of microjansky radio sources detected in ultradeep 1.4 GHz maps centered on the Hubble Deep Field-North (HDF-N) and the Hawaii Survey Fields SSA 13 and SSA 22. Our spectroscopic redshifts for 169 radio sources reveal a flat median redshift distribution, and these sources are hosted by similarly luminous optical L* galaxies, regardless of redshift. We suggest that the absence of low optical luminosity galaxies at low redshifts, where there are no selection effects, is due to small galaxies not being efficient at retaining the cosmic rays necessary to host microjansky radio sources. From our submillimeter measurements for 278 radio sources, we find error-weighted mean 850 μm fluxes of 1.72 ± 0.09 mJy for the total sample, 2.37 ± 0.13 mJy for the optically faint (I > 23.5) subsample, and 1.04 ± 0.13 mJy for the optically bright (I < 23.5) subsample. We significantly (>3 σ) detect in the submillimeter 50 of the radio sources, 38 with I > 23.5. Spectroscopic redshifts for three of the I < 23.5 submillimeter-detected radio sources are in the range z = 1.0-3.4, and all show active galactic nucleus (AGN) signatures. Using only the submillimeter-mapped regions, we find that 69% ± 9% of the submillimeter-detected radio population are at I > 23.5. We also find that 66% ± 7% of the S850 μm > 5 mJy (>4 σ) sources are radio-identified. We use our spectroscopic sample to determine the evolution with redshift of the radio power, and hence the far-infrared (FIR) luminosity (through the local FIR-radio correlation). We find that millimetric redshift estimates at low redshifts are best made with an FIR template intermediate between a Milky Way-type galaxy and a starburst galaxy, and those at high redshifts with an Arp 220 template.