2007PASJ...59..889H

Query : 2007PASJ...59..889H

2007PASJ...59..889H - Publ. Astron. Soc. Jap., 59, 889-895 (2007/October-0)

Astrometry of galactic star-forming region Sharpless 269 with VERA: parallax measurements and constraint on outer rotation curve.

HONMA M., BUSHIMATA T., CHOI Y.K., HIROTA T., IMAI H., IWADATE K., JIKE T., KAMEYA O., KAMOHARA R., KAN-YA Y., KAWAGUCHI N., KIJIMA M., KOBAYASHI H., KUJI S., KURAYAMA T., MANABE S., MIYAJI T., NAGAYAMA T., NAKAGAWA A., OH C.S., OMODAKA T., OYAMA T., SAKAI S., SATO K., SASAO T., SHIBATA K.M., SHINTANI M., SUDA H., TAMURA Y., TSUSHIMA M. and YAMASHITA K.

Abstract (from CDS):

begin{HTML}We have performed high-precision astrometry of H2O maser sources in the Galactic star-forming region Sharpless 269 (S269) with VERA. We successfully detected a trigonometric parallax of 189 ± 8 µ as, corresponding to a source distance of 5.28+0.24–0.22 kpc. This is the smallest parallax ever measured, and the first one detected beyond 5 kpc. The source distance as well as the proper motions were used to constrain the outer rotation curve of the Galaxy, demonstrating that the difference of rotation velocities at the Sun and at S269 (which is 13.1 kpc away from the Galaxy's center) is less than 3%. This gives the strongest constraint on the flatness of the outer rotation curve, and provides a direct confirmation of the existence of a large amount of dark matter in the Galaxy's outer disk.

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Journal keyword(s): ISM: star forming regions - ISM: individual: Sharpless 269 - masers (H2O) - VERA

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
2 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
3 QSO J0613+1306 Bla 06 13 57.69275201 +13 06 45.4008349       19.5   ~ 61 1
4 [WBN74] S 269 IRS 2W IR 06 14.6 +13 49           ~ 8 0
5 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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