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The outer rotation curve project with VERA: Trigonometric parallax of IRAS 05168+3634

Published online by Cambridge University Press:  26 February 2013

Nobuyuki Sakai ,
Mareki Honma ,
Hiroyuki Nakanishi ,
Hirofumi Sakanoue ,
Tomoharu Kurayama  and
the VERA collaboration
Nobuyuki Sakai
Affiliation:
The Graduate University for Advanced Studies (Sokendai), Mitaka, Tokyo 181-8588, Japan email: [email protected]
Mareki Honma
Affiliation:
The Graduate University for Advanced Studies (Sokendai), Mitaka, Tokyo 181-8588, Japan email: [email protected] Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Hiroyuki Nakanishi
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
Hirofumi Sakanoue
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
Tomoharu Kurayama
Affiliation:
Center for Fundamental Education, Teikyo University of Science, 2525 Yatsusawa, Uenohara, Yamanashi 409-0193, Japan
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Abstract

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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 Θ = 227+9−11 km s−1 at the source position, assuming Θ0 = 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 (Umean, Vmean) = (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.

Keywords

Galaxy: kinematics and dynamicsISM: individual (IRAS, 05168+3634)techniques: interferometricastrometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 95 - 98
Copyright
Copyright © International Astronomical Union 2013

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