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• W3100644291 abstract "Abstract As part our investigation into the Galactic rotation curve, we carried out Very Long Baseline Interferometry (VLBI) observations towards the star-forming region IRAS 01123+6430 using VLBI Exploration of Radio Astrometry (VERA) to measure its annual parallax and proper motion. The annual parallax was measured to be 0.151 ± 0.042 mas, which corresponds to a distance of $D = 6.61^{+2.55}_{-1.44}:{rm kpc}$, and the obtained proper motion components were $(mu _alpha {rm cos}delta ,, mu _delta ) = (-1.44 pm 0.15,, -0.27 pm 0.16):{rm mas:yr^{-1}}$ in equatorial coordinates. Assuming Galactic constants of $(R_0,, Theta _0) = (8.05 pm 0.45:{rm kpc},, 238 pm 14:{rm km:s^{-1}})$, the Galactocentric distance and rotation velocity were measured to be $(R,, Theta ) = (13.04 pm 2.24:{rm kpc},, 239 pm 22:{rm km:s^{-1}})$, which are consistent with a flat Galactic rotation curve. The newly estimated distance provides a more accurate bolometric luminosity of the central young stellar object, $L_{rm Bol} = (3.11 pm 2.86) times 10^{3}, L_{odot }$, which corresponds to a spectral type of B1–B2. Analysis of ${}^{12}{rm{CO}}$ (J = 1–0) survey data obtained with the Five College Radio Astronomical Observatory (FCRAO) 14 m telescope shows that the molecular cloud associated with IRAS 01123+6430 consists of arc-like and linear components, which matches well a structure predicted by numerical simulation of the cloud–cloud collision phenomenon. The coexistence of arc-like and linear components implies that the relative velocity of the two initial clouds was as slow as 3–$5:{rm km, s^{-1}}$, which meets the expected criteria of massive star formation where the core mass is effectively increased in the presence of low relative velocity (∼3–5 km s−1), as suggested by Takahira, Tasker, and Habe (2014, ApJ, 792, 63)." @default.
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• W3100644291 date "2019-10-24" @default.
• W3100644291 modified "2023-09-27" @default.
• W3100644291 title "Outer rotation curve of the Galaxy with VERA. IV. Astrometry of IRAS 01123+6430 and the possibility of cloud–cloud collision" @default.
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• W3100644291 doi "https://doi.org/10.1093/pasj/psz101" @default.
• W3100644291 hasPublicationYear "2019" @default.
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