NO EVOLUTION IN THE IR–RADIO RELATION FOR IR-LUMINOUS GALAXIES AT z < 2 IN THE COSMOS FIELD
NO EVOLUTION IN THE IR–RADIO RELATION FOR IR-LUMINOUS GALAXIES AT z < 2 IN THE COSMOS FIELD
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DOI：
10.1088/2041-8205/714/2/l190
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发表时间：
2010-03
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通讯作者：
M. Sargent;E. Schinnerer;E. Murphy;C. Carilli;G. Helou;H. Aussel;É. Le Floc'h;D. Frayer;O. Ilbert;P. Oesch;M. Salvato;V. Smolčić;J. Kartaltepe;D. Sanders
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作者：
M. Sargent;E. Schinnerer;E. Murphy;C. Carilli;G. Helou;H. Aussel;É. Le Floc'h;D. Frayer;O. Ilbert;P. Oesch;M. Salvato;V. Smolčić;J. Kartaltepe;D. Sanders
先前对红外-无线电与高红移关系的观测研究，在宇宙巡天场的限定区域内，使用了任何可探测的恒星形成系统在给定的红移上。因此，推断的演化依赖于(1)非常红外发光的高z源和(2)更不均匀的低(er)-z样品（通常缺乏最强的红外发射器）的平均红外/无线电特性之间的比较。在这封信中，我们利用深红外（特别是斯皮策24 μm）和甚大阵列1.4 GHz对COSMOS场的观测，考虑了过去10 Gyr中具有可比光度的天体种群。与最近的模型预测一致，在校正偏差后，超亮红外星系和在红外光度函数演化的明亮端上的星系在z ~ 2范围内的平均红外/射电比没有显示任何变化。未经校正的数据显示阳性进化指数为~ 0.3。
Previous observational studies of the infrared (IR)–radio relation out to high redshift employed any detectable star-forming systems at a given redshift within the restricted area of cosmological survey fields. Consequently, the evolution inferred relies on a comparison between the average IR/radio properties of (1) very IR-luminous high-z sources and (2) more heterogeneous low(er)-z samples that often lack the strongest IR emitters. In this Letter, we consider populations of objects with comparable luminosities over the last 10 Gyr by taking advantage of deep IR (especially Spitzer 24 μm) and Very Large Array 1.4 GHz observations of the COSMOS field. Consistent with recent model predictions, both Ultra Luminous Infrared Galaxies and galaxies on the bright end of the evolving IR luminosity function do not display any change in their average IR/radio ratios out to z ∼ 2 when corrected for bias. Uncorrected data suggested ∼0.3 dex of positive evolution.