论文标题
来自Ukidss和Vista调查的Zyjhk的微弱标准
Faint Standards for ZYJHK from the UKIDSS and VISTA Surveys
论文作者
论文摘要
当前定义的“ Ukirt微弱标准”的JHK幅度在10到15之间，K_Median = 11.2。对于下一代大型望远镜，这些恒星太明亮了。我们已经使用多上观测作为UKIRT红外深天空调查（UKIDSS）的一部分以及可见的和红外的天文学调查望远镜（Vista）调查望远镜，以识别16-19范围内JHK幅度的不变恒星。恒星是从UKIDSS深层术后调查（DXS）和Ultra Deep Survey（UDS），WFCAM校准数据（WFCAMCAL08B），Vista Deep Deep teragalactic观测（视频）和Ultoravista中选择的。将从近红外数据库中选择的源与Pan-Starrs Data Release 2的光学到近红外光度法配对，Gaia Astresretric Data Release 2使用。使用颜色指数和其他测量值来排除似乎并不是简单的单星星的源。从169个来源的初始选择中，我们提出了81个标准恒星的最终样本，具有ZyjHK幅度，或一个子集，每个恒星中的每个滤镜中有20至600个观测值。新标准的ks_median = 17.5。样品的相对光度不确定性为<0.006 mag，绝对不确定性估计为<〜0.02 mag。源是赤道分布的，并且可以从两个半球访问。
The currently defined "UKIRT Faint Standards" have JHK magnitudes between 10 and 15, with K_median=11.2. These stars will be too bright for the next generation of large telescopes. We have used multi-epoch observations taken as part of the UKIRT Infrared Deep Sky Survey (UKIDSS) and the Visible and Infrared Survey Telescope for Astronomy (VISTA) surveys to identify non-variable stars with JHK magnitudes in the range 16-19. The stars were selected from the UKIDSS Deep Extragalactic Survey (DXS) and Ultra Deep Survey (UDS), the WFCAM calibration data (WFCAMCAL08B), the VISTA Deep Extragalactic Observations (VIDEO) and UltraVISTA. Sources selected from the near-infrared databases were paired with the Pan-STARRS Data Release 2 of optical to near-infrared photometry and the Gaia astrometric Data Release 2. Colour indices and other measurements were used to exclude sources that did not appear to be simple single stars. From an initial selection of 169 sources, we present a final sample of 81 standard stars with ZYJHK magnitudes, or a subset, each with 20 to 600 observations in each filter. The new standards have Ks_median=17.5. The relative photometric uncertainty for the sample is <0.006 mag and the absolute uncertainty is estimated to be <~0.02 mag. The sources are distributed equatorially and are accessible from both hemispheres.
