Publication Details

AFRICAN RESEARCH NEXUS

SHINING A SPOTLIGHT ON AFRICAN RESEARCH

earth and planetary sciences

Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sight

Publications of the Astronomical Society of Japan, Volume 66, No. 6, Article 104, Year 2013

We report the results of the measurement of the trigonometric parallax of an H2O maser source in IRAS22555+6213 with the VLBI Exploration of Radio Astrometry (VERA). The annual parallax was determined to be 0.314±0.070mas, corresponding to a distance of $3.18+0.90-0.66,rm kpc$. Our results confirm IRAS22555+6213 to be located in the Perseus arm. We computed the peculiar motion of IRAS22555+6213 to be (Usrc, Vsrc, Wsrc)=(4±4, -32±6, 8±6)kms-1, where Usrc, Vsrc, and Wsrc are directed toward the Galactic center, in the direction of Galactic rotation and toward the Galactic north pole, respectively. IRAS22555+6213, NGC7538, and CepheusA lie along the same line of sight, and are within 2° on the sky. Their parallax distances, with which we derived their absolute position in the Milky Way, show that IRAS22555+6213 and NGC7538 are associated with the Perseus Arm, while CepheusA is located in the Local Arm. We compared the kinematic distances of IRAS22198+6336, G108.18+05.51, G108.20-00.58, G108.47+02.81, G108.59+00.49, CepheusA, NGC7538, G111.23-01.23, G111.25-00.76, and IRAS22555+6213 derived with flat and non-flat rotation curves with their parallax distance and found the kinematic distance derived from the non-flat rotation assumption (-5 to -39kms-1 lag) to be consistent with the parallax distance.
Statistics
Citations: 14
Authors: 14
Affiliations: 4
Identifiers