%0 Generic %1 nishimura2017forest %A Nishimura, Atsushi %A Minamidani, Tetsuhiro %A Umemoto, Tomofumi %A Fujita, Shinji %A Matsuo, Mitsuhiro %A Hattori, Yusuke %A Kohno, Mikito %A Yamagishi, Mitsuyoshi %A Tsuda, Yuya %A Kuriki, Mika %A Kuno, Nario %A Torii, Kazufumi %A Tsutumi, Daichi %A Okawa, Kazuki %A Sano, Hidetoshi %A Tachihara, Kengo %A Ohama, Akio %A Fukui, Yasuo %D 2017 %K cloud collision sfr %T FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) 2: Possible evidence for formation of NGC~6618 cluster in M17 by cloud-cloud collision %U http://arxiv.org/abs/1706.06956 %X We present $^12$CO $J=$1--0, $^13$CO $J=$1--0 and C$^18$O $J=$1--0 images of the M17 giant molecular clouds obtained as part of FUGIN (FOREST Ultra-wide Galactic Plane Survey InNobeyama) project. The observations cover the entire area of M17 SW and M17 N clouds at the highest angular resolution ($\sim$19$"$) to date which corresponds to $\sim$ 0.15 pc at the distance of 2.0 kpc. We find that the region consists of four different velocity components: very low velocity (VLV) clump, low velocity component (LVC), main velocity component (MVC), and high velocity component (HVC). The LVC and the HVC have cavities. UV photons radiated from NGC 6618 cluster penetrate into the N cloud up to $\sim$ 5 pc through the cavities and interact with molecular gas. This interaction is correlated with the distribution of YSOs in the N cloud. The LVC and the HVC are distributed complementary after that the HVC is displaced by 0.8 pc toward the east-southeast direction, suggesting that collision of the LVC and the HVC create the cavities in both clouds. The collision velocity and timescale are estimated to be 9.9 km s$^-1$ and $1.1 10^5$ yr, respectively. The high collision velocity can provide the mass accretion rate up to 10$^-3$ $M_\solar$ yr$^-1$, and the high column density ($4 10^23$ cm$^-2$) might result in massive cluster formation. The scenario of cloud-cloud collision likely well explains the stellar population and its formation history of NGC 6618 cluster proposed by Hoffmeister et al. (2008).

@misc{nishimura2017forest, abstract = {We present $^{12}$CO $J=$1--0, $^{13}$CO $J=$1--0 and C$^{18}$O $J=$1--0 images of the M17 giant molecular clouds obtained as part of FUGIN (FOREST Ultra-wide Galactic Plane Survey InNobeyama) project. The observations cover the entire area of M17 SW and M17 N clouds at the highest angular resolution ($\sim$19$"$) to date which corresponds to $\sim$ 0.15 pc at the distance of 2.0 kpc. We find that the region consists of four different velocity components: very low velocity (VLV) clump, low velocity component (LVC), main velocity component (MVC), and high velocity component (HVC). The LVC and the HVC have cavities. UV photons radiated from NGC 6618 cluster penetrate into the N cloud up to $\sim$ 5 pc through the cavities and interact with molecular gas. This interaction is correlated with the distribution of YSOs in the N cloud. The LVC and the HVC are distributed complementary after that the HVC is displaced by 0.8 pc toward the east-southeast direction, suggesting that collision of the LVC and the HVC create the cavities in both clouds. The collision velocity and timescale are estimated to be 9.9 km s$^{-1}$ and $1.1 \times 10^{5}$ yr, respectively. The high collision velocity can provide the mass accretion rate up to 10$^{-3}$ $M_{\solar}$ yr$^{-1}$, and the high column density ($4 \times 10^{23}$ cm$^{-2}$) might result in massive cluster formation. The scenario of cloud-cloud collision likely well explains the stellar population and its formation history of NGC 6618 cluster proposed by Hoffmeister et al. (2008).}, added-at = {2017-06-22T09:32:52.000+0200}, author = {Nishimura, Atsushi and Minamidani, Tetsuhiro and Umemoto, Tomofumi and Fujita, Shinji and Matsuo, Mitsuhiro and Hattori, Yusuke and Kohno, Mikito and Yamagishi, Mitsuyoshi and Tsuda, Yuya and Kuriki, Mika and Kuno, Nario and Torii, Kazufumi and Tsutumi, Daichi and Okawa, Kazuki and Sano, Hidetoshi and Tachihara, Kengo and Ohama, Akio and Fukui, Yasuo}, biburl = {https://www.bibsonomy.org/bibtex/2181ffcfd29461d060385345d86339fa2/miki}, description = {[1706.06956] FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) 2: Possible evidence for formation of NGC~6618 cluster in M17 by cloud-cloud collision}, interhash = {c261c78b4a443d80bdfccb10a4f6ff13}, intrahash = {181ffcfd29461d060385345d86339fa2}, keywords = {cloud collision sfr}, note = {cite arxiv:1706.06956Comment: 24 pages, 13 figures, submitted to PASJ}, timestamp = {2017-06-22T09:32:52.000+0200}, title = {FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) 2: Possible evidence for formation of NGC~6618 cluster in M17 by cloud-cloud collision}, url = {http://arxiv.org/abs/1706.06956}, year = 2017 }