Details

Autor(en) / Beteiligte

• Hachisuka, K
• Brunthaler, A
• Menten, K. M
• Reid, M. J
• Imai, H
• Hagiwara, Y
• Miyoshi, M
• Horiuchi, S
• Sasao, T

Titel

Water Maser Motions in W3(OH) and a Determination of Its Distance

Ist Teil von

• The Astrophysical journal, 2006-07, Vol.645 (1), p.337-344

Ort / Verlag

Chicago, IL: IOP Publishing

Erscheinungsjahr

2006

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We report phase-referencing VLBA observations of H sub(2)O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions. The measured annual parallax is 0.489 c 0.017 mas (2.04 c 0.07 kpc), where the error is dominated by a systematic atmospheric contribution. This distance is consistent with photometric distances from previous observations and with the distance determined from CH sub(3)OH maser astrometry presented in a related paper. We also find that the source driving the H sub(2)O outflow, the "TW-object," moves with a three-dimensional velocity of >7 km s super(-1) relative to the ultracompact H II region W3(OH).