DOI QR코드

DOI QR Code

TRIGONOMETRIC DISTANCE AND PROPER MOTION OF IRAS 20056+3350: A MASSIVE STAR FORMING REGION ON THE SOLAR CIRCLE

  • BURNS, ROSS A. (Graduate School of Science and Engineering, Kagoshima University) ;
  • NAGAYAMA, TAKUMI (Mizusawa VLBI Observatory, National Astronomical Observatory of Japan) ;
  • HANDA, TOSHIHIRO (Graduate School of Science and Engineering, Kagoshima University) ;
  • OMODAKA, TOSHIHIRO (Graduate School of Science and Engineering, Kagoshima University) ;
  • NAKAGAWA, AKIHARU (Graduate School of Science and Engineering, Kagoshima University) ;
  • NAKANISHI, HIROYUKI (Graduate School of Science and Engineering, Kagoshima University) ;
  • HAYASHI, MASAHIKO (National Astronomical Observatory of Japan) ;
  • SHIZUGAM, MAKOTO (Mizusawa VLBI Observatory, National Astronomical Observatory of Japan)
  • 투고 : 2014.11.30
  • 심사 : 2015.06.30
  • 발행 : 2015.09.30

초록

We report our measurements of the trigonometric distance and proper motion of IRAS 20056+3350, obtained from the annual parallax of $H_2O$ masers. Our distance of $D=4.69^{+0.65}_{-0.51}kpc$, which is 2.8 times larger than the near kinematic distance adopted in the literature, places IRAS 20056+3350 at the leading tip of the Local arm and proximal to the Solar circle. We estimated the proper motion of IRAS 20056+3350 to be (${\mu}_{\alpha}cos{\delta}$, ${\mu}_{\delta}$) = ($-2.62{\pm}0.33$, $-5.65{\pm}0.52$) $mas\;yr^{-1}$ from the group motion of $H_2O$ masers, and use our results to estimate the angular velocity of Galactic rotation at the Galactocentric distance of the Sun, ${\Omega}_0=29.75{\pm}2.29km\;s^{-1}kpc^{-1}$, which is consistent with the values obtained for other tangent points and Solar circle objects.

키워드

참고문헌

  1. Burns, R. A., et al., 2014, VLBI Observations of H2O Maser Annual Parallax and Proper Motion in IRAS 20143+3634:Reflection on the Galactic Constants, PASJ, 66, 102, (in press) arXiv:1404, 5506 https://doi.org/10.1093/pasj/psu094
  2. Fomalont, E. B., & Petrov, L., et al., 2003, The Second VLBA Calibrator Survey: VCS2, AJ, 126, 2562 https://doi.org/10.1086/378712
  3. Honma, M., & Nagayama, T., et al., 2012, Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry, PASJ, 64, 136 https://doi.org/10.1093/pasj/64.6.136
  4. Imai, H., Omi, R., & Kurayama, T., et al., 2011, Multiple Outflows Traced by H2O Masers around the Ultra-Compact H II Region G 34.26+0.15, PASJ, 63, 1293 https://doi.org/10.1093/pasj/63.6.1293
  5. Nagayama, T., & Omodaka, T., et al., 2011, Astrometry of Galactic Star-Forming Region Onsala 1 with VERA:Estimation of Angular Velocity of Galactic Rotation at the Sun, PASJ, 63, 23 https://doi.org/10.1093/pasj/63.1.23
  6. Reid, M. J., & Menten, K. M., et al., 2014, Trigonometric Parallaxes of High Mass Star Forming Regions: The Structure and Kinematics of the Milky Way, The Astrophysical Journal, 783, 130 https://doi.org/10.1088/0004-637X/783/2/130
  7. Xu, Y., Li, J. J., & Reid, M. J., et al., 2013, The Magnetic Field Morphology of the Class 0 Protostar L1157-mm, ApJ, 769, 15 https://doi.org/10.1088/0004-637X/769/1/15
  8. Zhang, Q., & Hunter, T. R., et al., 2005, Search for CO Outflows toward a Sample of 69 High-Mass Protostellar Candidates. II. Outflow Properties, ApJ, 625, 864 https://doi.org/10.1086/429660