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VVV DR1:来自近红外ESO公众调查的Milky Way凸出面和南平面的首次数据发布Via Lactea中的VISTA变量

VVV DR1: The First Data Release of the Milky Way Bulge and Southern Plane from the Near-Infrared ESO Public Survey VISTA Variables in the Via Lactea

R. K. Saito, M. Hempel, D. Minniti, P. W. Lucas, M. Rejkuba, I. Toledo, O. A. Gonzalez, J. Alonso-Garcia, M. J. Irwin, E. Gonzalez-Solares, S. T. Hodgkin, J. R.… 展开作者

R. K. Saito, M. Hempel, D. Minniti, P. W. Lucas, M. Rejkuba, I. Toledo, O. A. Gonzalez, J. Alonso-Garcia, M. J. Irwin, E. Gonzalez-Solares, S. T. Hodgkin, J. R. Lewis, N. Cross, V. D. Ivanov, E. Kerins, J. P. Emerson, M. Soto, E. B. Amores, S. Gurovich, I. Dekany, R. Angeloni, J. C. Beamin, M. Catelan, N. Padilla, M. Zoccali, P. Pietrukowicz, C. Moni Bidin, F. Mauro, D. Geisler, S. L. Folkes, S. E. Sale, J. Borissova, R. Kurtev, A. V. Ahumada, M. V. Alonso, A. Adamson, J. I. Arias, R. M. Bandyopadhyay, R. H. Barba, B. Barbuy, G. L. Baume, L. R. Bedin, A. Bellini, R. Benjamin, E. Bica, C. Bonatto, L. Bronfman, G. Carraro, A. N. Chene, J. J. Claria, J. R. A. Clarke, C. Contreras, A. Corvillon, R. de Grijs, B. Dias, J. E. Drew, C. Farina, C. Feinstein, E. Fernandez-Lajus, R. C. Gamen, W. Gieren, B. Goldman, C. Gonzalez-Fernandez, R. J. J. Grand, G. Gunthardt, N. C. Hambly, M. M. Hanson, K. G. Helminiak, M. G. Hoare, L. Huckvale, A. Jordan, K. Kinemuchi, A. Longmore, M. Lopez-Corredoira, T. Maccarone, D. Majaess, E. L. Martin, N. Masetti, R. E. Mennickent, I. F. Mirabel, L. Monaco, L. Morelli, V. Motta, T. Palma, M. C. Parisi, Q. Parker, F. Penaloza, G. Pietrzynski, G. Pignata, B. Popescu, M. A. Read, A. Rojas, A. Roman-Lopes, M. T. Ruiz, I. Saviane, M. R. Schreiber, A. C. Schroder, S. Sharma, M. D. Smith, L. Sodre, J. Stead, A. W. Stephens, M. Tamura, C. Tappert, M. A. Thompson, E. Valenti, L. Vanzi, N. A. Walton, W. Weidmann, A. Zijlstra

摘要:

ESO在Via Lactea(VVV)的VISTA变量公众调查始于2010年。VVV目标562平方米度在银河系凸出和邻近的平面区域,预计将运行约5年。本文介绍了第一个观测季节的调查观测进展、观测策略和所获资料的质量。观测是在4米VISTA望远镜上用ZYJHKs滤光片进行的。除多波段成像外,Ks滤波器中的变异性监测活动也已开始。使用剑桥天文测量单位的管道进行数据简化。测光和天体测量校准是通过在每个指向中观察到的许多2 MASS源来执行的。第一次发布的数据包含了2010年观测季节在ZYJHKs滤波器中拍摄的348个单独点的孔径测光和天体测量目录。典型图像质量约为0.9-1.0”。严格的光度和图像质量要求的调查是满足100%的JHK的图像在磁盘区域和90%的JHK的图像在凸起区域。在Z和Y图像中,椎间盘的完整性为84%,而隆起的完整性为40%。第一季的星表包含1.28x10^8颗位于球核的恒星源,以及1.68x10^8颗位于星盘区域的恒星源,它们至少在一个光度带中被探测到。合并后的多波段星表包含超过1.63x10^8个恒星源。其中约10%是由于相邻点重叠而导致的双重检测。这些重叠的多个检测被用于验证数据的质量。JHKs带中的图像通常比2 MASS深约4等。星等极限和光度质量强烈地依赖于内银河区域的拥挤程度。Ks=15-18等的天体测量具有rms ~35-175等。

英文摘要:

The ESO Public Survey VISTA Variables in the Via Lactea (VVV) started in 2010. VVV targets 562 sq. deg in the Galactic bulge and an adjacent plane region and is expected to run for ~5 years. In this paper we describe the progress of the survey observations in the first observing season, the observing strategy and quality of the data obtained. The observations are carried out on the 4-m VISTA telescope in the ZYJHKs filters. In addition to the multi-band imaging the variability monitoring campaign in the Ks filter has started. Data reduction is carried out using the pipeline at the Cambridge Astronomical Survey Unit. The photometric and astrometric calibration is performed via the numerous 2MASS sources observed in each pointing. The first data release contains the aperture photometry and astrometric catalogues for 348 individual pointings in the ZYJHKs filters taken in the 2010 observing season. The typical image quality is ~0.9-1.0". The stringent photometric and image quality requirements of the survey are satisfied in 100% of the JHKs images in the disk area and 90% of the JHKs images in the bulge area. The completeness in the Z and Y images is 84% in the disk, and 40% in the bulge. The first season catalogues contain 1.28x10^8 stellar sources in the bulge and 1.68x10^8 in the disk area detected in at least one of the photometric bands. The combined, multi-band catalogues contain more than 1.63x10^8 stellar sources. About 10% of these are double detections due to overlapping adjacent pointings. These overlapping multiple detections are used to characterise the quality of the data. The images in the JHKs bands extend typically ~4 mag deeper than 2MASS. The magnitude limit and photometric quality depend strongly on crowding in the inner Galactic regions. The astrometry for Ks=15-18 mag has rms ~35-175 mas.

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