Survey of Near-infrared Diffuse Interstellar Bands in Y and J Bands. I. Newly Identified Bands
Survey of Near-infrared Diffuse Interstellar Bands in Y and J Bands. I. Newly Identified Bands
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DOI：
10.3847/1538-4365/ac7567
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发表时间：
2022-06
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通讯作者：
S. Hamano;N. Kobayashi;H. Kawakita;K. Takenaka;Y. Ikeda;N. Matsunaga;S. Kondo;H. Sameshima;K. Fukue;S. Otsubo;A. Arai;C. Yasui;H. Kobayashi;G. Bono;I. Saviane
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作者：
S. Hamano;N. Kobayashi;H. Kawakita;K. Takenaka;Y. Ikeda;N. Matsunaga;S. Kondo;H. Sameshima;K. Fukue;S. Otsubo;A. Arai;C. Yasui;H. Kobayashi;G. Bono;I. Saviane
通过分析31颗红化早型星（0.04 < E（B − V）< 4.58）和一颗未红化参考星星的近红外（NIR）高分辨率（R = 20，000和28，000）光谱，我们寻找了0.91 < λ < 1.33 μm区域的弥漫星际带（DIB）。这些光谱是使用WINERED光谱仪收集的，该光谱仪于2012-2016年安装在日本Koyama天文台的1.3米Araki望远镜上，并于2017-2018年安装在智利La Silla天文台的3.58米新技术望远镜上。我们检测到54个DIB-其中25个是新发现的这项研究-和8个DIB候选人。使用这个更新的列表，在很宽的波长范围内，从光学到近红外，DIB分布进行了研究。平均而言，发现NIR DIB的FWHM值比光学DIB的FWHM值窄，这表明在较长波长处的DIB倾向于由较大的分子引起。假设较大的载流子负责较长波长处的DIB，并且具有较大的振子强度，我们发现DIB载流子的总列密度倾向于随着DIB波长的增加而减小。本文还讨论了近红外DIB的候选分子和离子。
We searched for diffuse interstellar bands (DIBs) in the 0.91 < λ < 1.33 μm region by analyzing the near-infrared (NIR) high-resolution (R = 20,000 and 28,000) spectra of 31 reddened early-type stars (0.04 < E(B − V) < 4.58) and an unreddened reference star. The spectra were collected using the WINERED spectrograph, which was mounted on the 1.3 m Araki telescope at Koyama Astronomical Observatory, Japan, in 2012–2016, and on the 3.58 m New Technology Telescope at La Silla Observatory, Chile, in 2017–2018. We detected 54 DIBs—25 of which are newly detected by this study—and eight DIB candidates. Using this updated list, the DIB distributions over a wide wavelength range, from optical to NIR, are investigated. The FWHM values of the NIR DIBs are found to be narrower than those of the optical DIBs, on average, which suggests that the DIBs at longer wavelengths tend to be caused by larger molecules. Assuming that the larger carriers are responsible for the DIBs at longer wavelengths, and have larger oscillator strengths, we found that the total column densities of the DIB carriers tend to decrease with increasing DIB wavelength. The candidate molecules and ions for the NIR DIBs are also discussed.