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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.06258 |
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| _version_ | 1866917318370525184 |
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| author | Hamada, Shota Kohno, Mikito Omodaka, Toshihiro Sakai, Nobuyuki Urago, Riku Nagayama, Takumi Kobayashi, Hideyuki Ueno, Yuji |
| author_facet | Hamada, Shota Kohno, Mikito Omodaka, Toshihiro Sakai, Nobuyuki Urago, Riku Nagayama, Takumi Kobayashi, Hideyuki Ueno, Yuji |
| contents | We performed very long baseline interferometry (VLBI) observations to measure the trigonometric parallax of H$_2$O maser sources in the outer massive star-forming region IRAS 23385+6053 using the VLBI Exploration of Radio Astrometry (VERA) in Japan. The annual parallax is $π=0.460 \pm 0.086$~mas, which corresponds to a distance of $2.17^{+0.50}_{-0.34}$ kpc, roughly half the kinematic distance of 4.9 kpc reported in previous studies. The proper motion of IRAS 23385+6053 is obtained to be ($μ_α\cosδ$,$μ_δ$)=($-3.73\pm0.53$, $-2.0{7}\pm0.73$) mas yr$^{-1}$. Based on VLBI astrometry result, we derived the physical properties of molecular clouds in which H$_2$O masers have been detected, including IRAS 23385+6053 in the Cepheus and Cassiopeia region. We discuss the line-of-sight structures of the giant molecular clouds using the trigonometric distances obtained from the H$_{2}$O maser sources. Our results suggest that molecular clouds in the Perseus arm extend over approximately $2$ kpc at the Cepheus and Cassiopeia region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_06258 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The trigonometric parallax of IRAS 23385+6053 and physical properties of molecular clouds based on the VLBI astrometry Hamada, Shota Kohno, Mikito Omodaka, Toshihiro Sakai, Nobuyuki Urago, Riku Nagayama, Takumi Kobayashi, Hideyuki Ueno, Yuji Astrophysics of Galaxies We performed very long baseline interferometry (VLBI) observations to measure the trigonometric parallax of H$_2$O maser sources in the outer massive star-forming region IRAS 23385+6053 using the VLBI Exploration of Radio Astrometry (VERA) in Japan. The annual parallax is $π=0.460 \pm 0.086$~mas, which corresponds to a distance of $2.17^{+0.50}_{-0.34}$ kpc, roughly half the kinematic distance of 4.9 kpc reported in previous studies. The proper motion of IRAS 23385+6053 is obtained to be ($μ_α\cosδ$,$μ_δ$)=($-3.73\pm0.53$, $-2.0{7}\pm0.73$) mas yr$^{-1}$. Based on VLBI astrometry result, we derived the physical properties of molecular clouds in which H$_2$O masers have been detected, including IRAS 23385+6053 in the Cepheus and Cassiopeia region. We discuss the line-of-sight structures of the giant molecular clouds using the trigonometric distances obtained from the H$_{2}$O maser sources. Our results suggest that molecular clouds in the Perseus arm extend over approximately $2$ kpc at the Cepheus and Cassiopeia region. |
| title | The trigonometric parallax of IRAS 23385+6053 and physical properties of molecular clouds based on the VLBI astrometry |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2603.06258 |