Infrared counterparts to ‘empty field’ steep-spectrum radio sources
Infrared counterparts to ‘empty field’ steep-spectrum radio sources
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DOI：
10.1093/mnras/203.3.727
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发表时间：
1983-07
影响因子：
4.8
通讯作者：
M. Lebofsky;G. Rieke;D. Walsh
中科院分区：
文献类型：
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作者：
M. Lebofsky;G. Rieke;D. Walsh
利用位于射电质心上直径为9角秒的多镜望远镜(MMT)红外光度计，观测到了Jodrell Bank调查中对应于POSS上空场的陡谱射电源样本。这项技术以前在平谱光源上取得了成功，平谱光源通常相对紧凑，但一直被认为不适合陡谱光源，因为它们通常是延伸的，光学/IR对应物的位置可能太不确定。在一个由18个“空场”信号源组成的样本中，我们在Kof 11进行了新的探测，加上之前的4次探测，18个信号源中有15个的成功率达到了15%，使87个信号源的完整样本的光学/红外探测率接近100%。对于一些探测到的源，我们还测定了JandH的量值，表明红外颜色可以用来对目标进行分类。这个样本显然包括具有z∼1的星系和具有非常陡峭的光学-红外光谱的类星体。
A sample of steep-spectrum radio sources from the Jodrell Bank survey which correspond to empty fields on the POSS has been observed using the Multiple Mirror Telescope (MMT)IR photometer with a 9 arcsec diameter aperture positioned on the radio centroids. This technique has previously been successful with flat-spectrum sources, which are normally relatively compact, but has been thought to be inappropriate for steep-spectrum sources because they are usually extended and the position of the optical/IR counterpart may be too uncertain. Of a sample of 18 ‘empty field’ sources, we made new detections atKof 11 which, with four previous detections, gives a success rate of 15 out of the 18 sources and brings the optical/IR detection rate of a complete sample of 87 sources close to 100 per cent. For some detected sources we also determined magnitudes atJandH, and show that the IR colours can be used to classify objects. The sample apparently includes galaxies withz∼ 1 and QSOs with very steep optical-IR spectra.