• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Interstellar extinction law toward the Galactic center. IV. J, H, and K-s bands from VVV red clump stars
【24h】

Interstellar extinction law toward the Galactic center. IV. J, H, and K-s bands from VVV red clump stars

机译：星际灭绝法对银河中心。 IV。 来自VVV红丛星星的J，H和K-S频段

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have determined the wavelength dependence of the extinction in the near-infrared bands (J, H, K-s) toward the Galactic center from the VVV (VISTA Variables in the Via Lactea) aperture photometry of the stars in the region vertical bar l vertical bar less than or similar to 2.degrees 0 and 0.degrees 5 less than or similar to vertical bar b vertical bar less than or similar to 1.degrees 0; this region consists of 12 VVV tiles. We have found significant systematic discrepancy up to similar to 0.1 mag between the stellar magnitudes of the same stars in overlapping VVV tiles. However, by carefully using the positions of red clump stars in color-magnitude diagrams as a tracer of the extinction and reddening, we are able to determine the average of the ratios of total to selective extinction to be A(K-s)/E(H - K-s) = 1.44 +/- 0.04, A(K-s)/E(J - K-s) = 0.423 +/- 0.024, A(H)/E(J - H) 1.25 +/- 0.04; from these ratios, a steep power law A(lambda) proportional to lambda(-alpha) whose index alpha is similar to 2.0-2.3 in the J, H, K-s wavelength range is estimated. This wavelength dependence is consistent with those obtained with the Mauna Kea Observatory photometric system employed in the Simultaneous 3-color InfraRed Imager for Unbiased Survey camera attached to the Infrared Survey Facility telescope in previous studies. Such a steep decline of extinction toward the longer wavelengths is also in line with recent results based on deep imaging surveys. The determined extinction law seems to be variable in the VVV from tile to tile, and it is not clear how much of this is due to real sight line variations and how much is due to observational systematic effects. Thus, there might be room for improvement of the extinction law determination from the existing VVV data, but this steep extinction law tends to locate heavily reddened objects in the Galactic plane more distant from us when their distance moduli are calculated from the observed reddening values.
机译：我们已经确定了从区域垂直条L垂直杆的恒星的VVV（VIVE leactia中的VISTA变量中的VISTA变量）朝向银河系中的近红外带（J，H，KS）的波长依赖性小于或类似于2.degrees 0和0°5的5，垂直条比垂直条小于或类似于1.degree 0;该地区由12个VVV瓷砖组成。在重叠VVV瓦片中，我们发现显着的系统差异在同一星的恒星幅度之间的恒星大小之间类似于0.1毫巴。然而，通过仔细使用颜色幅度图中的红色丛颗星的位置作为灭绝和变红的示踪剂，我们能够确定总量灭绝的总量的平均值为a（ks）/ e（h - KS）= 1.44 +/- 0.04，a（ks）/ e（j - ks）= 0.423 +/- 0.024，a（h）/ e（j - h）1.25 +/- 0.04;从这些比率来看，估计与λα相似的λ（ - λ）比例的陡幂法（Lambda）估计在J，H，K-S波长范围内的λα类似于2.0-2.3。这种波长依赖性与使用在同时3色红外成像仪中使用的Mauna Kea观测所测光器系统获得的那些，以便在先前的研究中连接到红外测量设施望远镜的无偏的调查相机。这种急剧下降朝向较长波长的急剧下降也与基于深度成像调查的最近结果一致。确定的灭绝法似乎在VVV中从瓷砖到瓷砖的变化，并不清楚这是由于真实的视线变化，以及由于观察系统效果的数量。因此，可能存在改善现有VVV数据的灭绝法测定的空间，但是当从观察到的变红值计算它们的距离模量时，这种陡峭的灭绝法倾向于将气体平面中的重新变红对象定位。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号