The VVDS-VLA Deep Field II. Optical and near infrared identifications of VLA S(1.4GHz)>80 microJy sources in the VIMOS VLT Deep Survey VVDS-02h field
The VVDS-VLA Deep Field II. Optical and near infrared identifications of VLA S(1.4GHz)>80 microJy sources in the VIMOS VLT Deep Survey VVDS-02h field
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VVDS-VLA 深场 II。
DOI：
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发表时间：
2005
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通讯作者：
D. Rizzo
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作者：
P. Ciliegi;G. Zamorani;M. Bondi;L. Pozzetti;M. Bolzonella;L. Gregorini;L. Gregorini;B. Garilli;A. Iovino;H. McCracken;Y. Mellier;M. Radovich;H. D. Ruiter;P. Parma;D. Bottini;V. Brun;O. Fèvre;D. Maccagni;J. Picat;R. Scaramella;M. Scodeggio;L. Tresse;G. Vettolani;A. Zanichelli;C. Adami;M. Arnaboldi;S. Arnouts;S. Bardelli;A. Cappi;S. Charlot;T. Contini;S. Foucaud;P. Franzetti;L. Guzzo;O. Ilbert;B. Marano;C. Marinoni;G. Mathez;A. Mazure;B. Meneux;R. Merighi;P. Merluzzi;S. Paltani;A. Pollo;E. Zucca;A. Bongiorno;G. Busarello;I. Gavignaud;R. Pelló;V. Ripepi;D. Rizzo
在本文中，我们提出的光学和近红外识别的1054无线电源检测到的20厘米深的无线电调查下降到5西格玛通量极限约80微焦耳在VIMOS VLT深调查VVDS-02 h深场获得的VLA。使用U、B、V、R、I和K数据，我们识别了718个射电源（约占整个样本的74%）。光度红移分析表明，在每个星等仓中，射电样品的光度红移中值高于整个光学样品，而射电源的中值（V-I）颜色比整个光学样品的中值颜色更红。这些结果表明，无线电探测优先选择具有较高的内在光学光度的星系。通过分析射电源的光学特性与射电源通量的关系，我们发现，在高射电源通量区（S> 1.0 mJy），约有35%的射电源是光学未识别的，而在最暗的区（S< 0.5 mJy），未识别源的比例下降到约25%。射电源总样本的I星等中值，也就是说，包括未识别的射电源在内，在最暗的无线电频段中比在具有较高射电源通量的频段中更亮。这表明大多数最微弱的射电源可能与相对较低的射电光度的物体在相对温和的红移，而不是无线电强大的，AGN类型的物体在高红移。
In this paper we present the optical and near-infrared identifications of the 1054 radio sources detected in the 20cm deep radio survey down to a 5sigma flux limit of about 80 microJy obtained with the VLA in the VIMOS VLT Deep Survey VVDS-02h deep field. Using U,B,V,R,I and K data, we identified 718 radio sources (~74% of the whole sample). The photometric redshift analysis shows that, in each magnitude bin, the radio sample has a higher median photometric redshift than the whole optical sample, while the median (V-I) color of the radio sources is redder than the median color of the whole optical sample. These results suggest that radio detection is preferentially selecting galaxies with higher intrinsic optical luminosity. From the analysis of the optical properties of the radio sources as function of the radio flux, we found that while about 35% of the radio sources are optically unidentified in the higher radio flux bin (S> 1.0 mJy), the percentage of unidentified sources decreases to about 25% in the faintest bins (S< 0.5 mJy). The median I magnitude for the total sample of radio sources,i.e. including also the unidentified ones, is brighter in the faintest radio bins than in the bin with higher radio flux. This suggests that most of the faintest radio sources are likely to be associated to relatively lower radio luminosity objects at relatively modest redshift, rather than radio-powerful, AGN type objects at high redshift.