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The outer rotation curve project with VERA: Trigonometric parallax of IRAS 05168+3634
Sakai, Nobuyuki; Honma, Mareki; Nakanishi, Hiroyuki; Sakanoue, Hirofumi; Kurayama, Tomoharu
AA(The Graduate University for Advanced Studies (Sokendai), Mitaka, Tokyo 181-8588, Japan ), AB(The Graduate University for Advanced Studies (Sokendai), Mitaka, Tokyo 181-8588, Japan ), AC(Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan), AD(Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan), AE(Center for Fundamental Education, Teikyo University of Science, 2525 Yatsusawa, Uenohara, Yamanashi 409-0193, Japan)
Advancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union, IAU Symposium, Volume 289, pp. 95-98
Publication Date:
Galaxy: kinematics and dynamics, ISM: individual (IRAS, 05168+3634), techniques: interferometric, astrometry,
Abstract Copyright:
(c) 2013: Copyright © International Astronomical Union 2013
Bibliographic Code:


We present a measurement of the trigonometric parallax of IRAS 05168+3634 with VERA. The parallax is 0.532 +/- 0.053 milli-arcsec, corresponding to a distance of 1.88+0.21 -0.17 kpc. This is significantly closer than the previous distance estimate of 6 kpc based on a kinematic distance measurement. This drastic change in the source distance implies the need for revised values of not only the physical parameters of IRAS 05168+3634, but it also impies a different location in the Galaxy, placing it in the Perseus arm rather than the Outer arm. We also measured the proper motion of the source. A combination of the distance and proper motion with the systemic velocity yields a rotation velocity Theta = 227+9 -11 km s-1 at the source position, assuming Theta0 = 240 km s-1. Our result, combined with previous VLBI results for six sources in the Perseus arm, indicates that the sources rotate systematically more slowly than the Galactic rotation velocity at the local standard of rest. In fact, we derive peculiar motions in the disk averaged over the seven sources in the Perseus arm of (U mean, V mean) = (11 +/- 3, -17 +/- 3) km s-1, which indicates that these seven sources are moving systematically toward the Galactic Center and lag behind the overall Galactic rotation.

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