Trigonometric Parallax of IRAS 22555+6213 with VERA: 3-Dimensional View of Sources Along the Same Line of Sight

Abstract

We report the results of the measurement of the trigonometric parallax of an H${}_2$O maser source in \r22 with the VLBI Exploration of Radio Astrometry (VERA). The annual parallax was determined to be 0.314$\pm$0.070~mas, corresponding to a distance of 3.18${}_{-0.66}^{+0.90}$~kpc. Our results confirm \r22 to be located in the Perseus arm. We computed the peculiar motion of \r22 to be $(U_{src},V_{src},W_{src})=(4\pm 4,-32\pm 6,8\pm 6)$~\kms, where $U_{src}$, $V_{src}$, and $W_{src}$ are directed toward the Galactic center, in the direction of Galactic rotation and toward the Galactic north pole, respectively. \r22, NGC\,7538 and Cepheus A lie along the same line of sight, and are within 2${}^{\circ }$ on the sky. Their parallax distances with which we derived their absolute position in the Milky Way show that \r22 and \ngc~are associated with the Perseus Arm, while \cepa~is located in the Local Arm. We compared the kinematic distances of \iras, \ga, \gb, \gc, \gd, \cepa, \ngc, \ge, \gf~and \r22~derived with flat and non-flat rotation curve with its parallax distance and found the kinematic distance derived from the non-flat rotation assumption ($-$5 to $-$39 \kms~lag) to be consistent with the parallax distance.

Accepted for publication in PASJ

References in corpus (2)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• Trigonometric Parallaxes of Star Forming Regions in the Perseus Spiral Arm

Cited by in corpus (5)

• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The First VERA Astrometry Catalog
• Trigonometric Parallaxes of Star Forming Regions Beyond the Tangent Point of the Sagittarius Spiral Arm
• Three-component Stackel model of the Galaxy based on the rotation curve from maser data
• The Ambiguity in the Definition and Behavior of the Gravitational and Cosmological `Coupling Constants' in the Theory of Induced Gravity