تقرير
Astrometry of Galactic Star-Forming Region ON2N with VERA: Estimation of the Galactic Constants
| العنوان: | Astrometry of Galactic Star-Forming Region ON2N with VERA: Estimation of the Galactic Constants |
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| المؤلفون: | Ando, Kazuma, Nagayama, Takumi, Omodaka, Toshihiro, Handa, Toshihiro, Imai, Hiroshi, Nakagawa, Akiharu, Nakanishi, Hiroyuki, Honma, Mareki, Kobayashi, Hideyuki, Miyaji, Takeshi |
| سنة النشر: | 2010 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | We have performed the astrometry of H2O masers in the Galactic star-forming region Onsala 2 North (ON2N) with the VLBI Exploration of Radio Astrometry.We obtained the trigonometric parallax of 0.261+/-0.009 mas, corresponding to the heliocentric distance of 3.83+/-0.13 kpc. ON2N is expected to be on the solar circle, because its radial velocity with respect to the Local Standard of Rest (LSR) is nearly zero. Using present parallax and proper motions of the masers, the Galactocentric distance of the Sun and the Galactic rotation velocity at the Sun are found to be R_0 = 7.80+/-0.26 kpc and Theta_0 = 213+/-5 km/s, respectively. The ratio of Galactic constants, namely the angular rotation velocity of the LSR can be determined more precisely, and is found to be Omega_0=Theta_0/R_0 = 27.3+/-0.8 km/s/kpc, which is consistent with the recent estimations but different from 25.9 km/s/kpc derived from the recommended values of Theta_0 and R_0 by the International Astronomical Union (1985). Comment: 8 pages, 4 figures, accepted for publication in PASJ (VERA 2nd special issue) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/pasj/63.1.45 |
| URL الوصول: | http://arxiv.org/abs/1012.5715 |
| رقم الأكسشن: | edsarx.1012.5715 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/pasj/63.1.45 |
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