Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center
Interstellar Extinction Law in the J, H, and Ks Bands toward the Galactic Center
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DOI：
10.1086/499038
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
S. Nishiyama;T. Nagata;N. Kusakabe;N. Matsunaga;T. Naoi;D. Kato;C. Nagashima;K. Sugitani;M. Tamura
中科院分区：
文献类型：
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作者：
S. Nishiyama;T. Nagata;N. Kusakabe;N. Matsunaga;T. Naoi;D. Kato;C. Nagashima;K. Sugitani;M. Tamura
我们用IRSF望远镜和SIRIUS相机对银心附近0.1 ° b ~ 2.0 °和0.5 ° b ~ 2.0 ° b ~ B ~ 1.0 °的观测，确定了银心附近近红外波段（J，H，Ks）的全消光与选择消光之比。利用红团簇星在色星等图上的位置作为消光和红化的示踪，我们确定了总消光与选择消光之比的平均值为A/E = 1.44 ± 0.01，A/E = 0.494 ± 0.006，AH/EJ-H = 1.42 ± 0.02，这比以往的研究结果明显减小。根据这些比值，我们估计出AJ：AH：A = 1：0.573 ± 0.009：0.331 ± 0.004和EJ-H/E = 1.72 ± 0.04，并发现幂律Aλ <$λ-1.99 <$0.02是这些波长上的一个很好的近似。此外，我们在调查中发现A/E的变化很小。这表明红外消光定律从一条视线到另一条视线是变化的，所谓的普遍性并不一定适用于红外波长。
We have determined the ratios of total to selective extinction in the near-infrared bands (J,H,Ks) toward the Galactic center from the observations of the region ∣ l ∣ ≲ 2.°0 and 0.°5 ≲ ∣ b ∣ ≲ 1.°0 with the IRSF telescope and the SIRIUS camera. Using the positions of red clump stars in color-magnitude diagrams as a tracer of the extinction and reddening, we determine the average of the ratios of total to selective extinction to be A/E = 1.44 ± 0.01, A/E = 0.494 ± 0.006, and AH/EJ-H = 1.42 ± 0.02, which are significantly smaller than those obtained in previous studies. From these ratios, we estimate that AJ : AH : A = 1 : 0.573 ± 0.009 : 0.331 ± 0.004 and EJ-H/E = 1.72 ± 0.04, and we find that the power law Aλ ∝ λ-1.99±0.02 is a good approximation over these wavelengths. Moreover, we find a small variation in A/E across our survey. This suggests that the infrared extinction law changes from one line of sight to another, and the so-called universality does not necessarily hold in the infrared wavelengths.