Survey of near-infrared diffuse interstellar bands in $Y$ and $J$ bands. I. Newly identified bands. (arXiv:2206.03131v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Hamano_S/0/1/0/all/0/1">Satoshi Hamano</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kobayashi_N/0/1/0/all/0/1">Naoto Kobayashi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kawakita_H/0/1/0/all/0/1">Hideyo Kawakita</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Takenaka_K/0/1/0/all/0/1">Keiichi Takenaka</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ikeda_Y/0/1/0/all/0/1">Yuji Ikeda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matsunaga_N/0/1/0/all/0/1">Noriyuki Matsunaga</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kondo_S/0/1/0/all/0/1">Sohei Kondo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sameshima_H/0/1/0/all/0/1">Hiroaki Sameshima</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fukue_K/0/1/0/all/0/1">Kei Fukue</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Otsubo_S/0/1/0/all/0/1">Shogo Otsubo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Arai_A/0/1/0/all/0/1">Akira Arai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yasui_C/0/1/0/all/0/1">Chikako Yasui</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kobayashi_H/0/1/0/all/0/1">Hitomi Kobayashi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bono_G/0/1/0/all/0/1">Giuseppe Bono</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Saviane_I/0/1/0/all/0/1">Ivo Saviane</a>
We searched for diffuse interstellar bands (DIBs) in the 0.91$<lambda<$1.33
$mu$m 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 to 2016, and on the 3.58-m New
Technology Telescope at La Silla Observatory, Chile, in 2017 to 2018. We
detected 54 DIBs, 34 of which are newly detected by this study, and eight DIB
candidates. Using this updated list, the DIB distributions in a wide wavelength
range from optical to NIR are investigated. The full width at half maximum
values of NIR DIBs are found to be narrower than those of optical DIBs on
average, which suggests that 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 the larger oscillator strengths, we found
that the total column densities of DIB carriers tend to decrease with
increasing DIB wavelength. The candidate molecules and ions for NIR DIBs are
also discussed.
We searched for diffuse interstellar bands (DIBs) in the 0.91$<lambda<$1.33
$mu$m 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 to 2016, and on the 3.58-m New
Technology Telescope at La Silla Observatory, Chile, in 2017 to 2018. We
detected 54 DIBs, 34 of which are newly detected by this study, and eight DIB
candidates. Using this updated list, the DIB distributions in a wide wavelength
range from optical to NIR are investigated. The full width at half maximum
values of NIR DIBs are found to be narrower than those of optical DIBs on
average, which suggests that 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 the larger oscillator strengths, we found
that the total column densities of DIB carriers tend to decrease with
increasing DIB wavelength. The candidate molecules and ions for NIR DIBs are
also discussed.
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