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VIMOS VLT深度测量:0226-04气田K波段跟踪

The VIMOS VLT Deep Survey: The K-band follow-up in the 0226-04 field

S. Temporin, A. Iovino, M. Bolzonella, H. J. McCracken, M. Scodeggio, B. Garilli, D. Bottini, V. Le Brun, O. Le Fevre, D. Maccagni, J. P. Picat, R. Scaramella, … 展开作者

S. Temporin, A. Iovino, M. Bolzonella, H. J. McCracken, M. Scodeggio, B. Garilli, D. Bottini, V. Le Brun, O. Le Fevre, D. Maccagni, J. P. Picat, R. Scaramella, L. Tresse, G. Vettolani, A. Zanichelli, C. Adami, S. Arnouts, S. Bardelli, A. Cappi, S. Charlot, P. Ciliegi, T. Contini, O. Cucciati, S. Foucaud, P. Franzetti, I. Gavignaud, L. Guzzo, O. Ilbert, B. Marano, C. Marinoni, A. Mazure, B. Meneux, R. Merighi, S. Paltani, R. Pello, A. Pollo, L. Pozzetti, M. Radovich, D. Vergani, G. Zamorani, E. Zucca, M. Bondi, A. Bongiorno, J. Brinchmann, S. de la Torre, F. Lamareille, Y. Mellier, C. J. Walcher

摘要:

目标。我们提出了一个新的KS波段调查,代表了一个显着的扩展,以前的宽视场KS波段成像调查内的0226-04领域的VIMOS-VLT深调查(VVDS)。新的数据比以前的成像程序增加了约458弧分^2,因此我们可以覆盖该区域内约600弧分^2的总连续区域。方法.为了减少污染,同时确保我们能够编制出一个真正的K-选择星表,直到K-波段的完整性极限,我们在最终的K-波段镶嵌图像和相应的深chi ^2-g 'r'i'图像上都直接识别了源。新确定的KS-波段的幅度结合使用的辅助多波长数据的测定准确的光度红移。结果最终的目录总计约52000个源,其中约4400个源的光谱红移来自VVDS第一次历元巡天。该星表完成了90%,直到K_Vega = 20.5等。我们提供了K_s波段星系计数和角关联函数测量,直到这样的星等极限。我们的结果与之前发表的工作非常一致。我们表明,使用K星等的光度红移的测定显着降低了灾难性的错误的发生率。本文提供的数据可通过CENCOS数据库公开获取。

英文摘要:

AIMS. We present a new Ks-band survey that represents a significant extension to the previous wide-field Ks-band imaging survey within the 0226-04 field of the VIMOS-VLT deep survey (VVDS). The new data add ~ 458 arcmin^2 to the previous imaging program, thus allowing us to cover a total contiguous area of ~ 600 arcmin^2 within this field. METHODS. Sources are identified both directly on the final K-band mosaic image and on the corresponding, deep chi^2-g'r'i' image from the CFHT Legacy Survey in order to reduce contamination while ensuring us the compilation of a truly K-selected catalogue down to the completeness limit of the Ks-band. The newly determined Ks-band magnitudes are used in combination with the ancillary multiwavelength data for the determination of accurate photometric redshifts. RESULTS. The final catalogue totals ~ 52000 sources, out of which ~ 4400 have a spectroscopic redshift from the VVDS first epoch survey. The catalogue is 90% complete down to K_Vega = 20.5 mag. We present K_s-band galaxy counts and angular correlation function measurements down to such magnitude limit. Our results are in good agreement with previously published work. We show that the use of K magnitudes in the determination of photometric redshifts significantly lowers the incidence of catastrophic errors. The data presented in this paper are publicly available through the CENCOS database.

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