Astrometry of Galactic star-forming regions G48.99-0.30 and G49.19-0.34 with VERA: Astrometric accuracy verification of VERA

K Sato,Yasumitsu Tamura, Atsuhiro Nakagawa,Tomoharu Kurayama, Manabu Honma,Ross A Burns,Yasuhiro Murata,Toshihiro Omodaka, Hiroya Kobayashi, Tomohiko Nagayama, Takuji Oyama

Publications of the Astronomical Society of Japan（2015）

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摘要

We conducted astrometry of H2O masers in Galactic star-forming regions G48.99−0.30 and G49.19−0.34 with VLBI Exploration of Radio Astrometry (VERA). The observational results yield the parallaxes of G48.99−0.30 and G49.19−0.34 to be 0.178 ± 0.017 mas ($5.62^{+0.59}_{-0.49}\:$kpc) and 0.211 ± 0.016 mas ($4.74^{+0.39}_{-0.33}\:$kpc), respectively. We discuss in detail the sources of astrometric erro...

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astrometry,parallaxes,techniques: high angular resolution

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