2010A&A...511A...2R

Query : 2010A&A...511A...2R

2010A&A...511A...2R - Astronomy and Astrophysics, volume 511, A2-2 (2010/2-2)

Trigonometric parallaxes of 6.7 GHz methanol masers.

RYGL K.L.J., BRUNTHALER A., REID M.J., MENTEN K.M., VAN LANGEVELDE H.J. and XU Y.

Abstract (from CDS):

Emission from the 6.7GHz methanol maser transition is very strong, is relatively stable, has small internal motions, and is observed toward numerous massive star-forming regions in the Galaxy. Our goal is to perform high-precision astrometry using this maser transition to obtain accurate distances to their host regions. Eight strong masers were observed during five epochs of VLBI observations with the European VLBI Network between 2006 June, and 2008 March. We report trigonometric parallaxes for five star-forming regions, with accuracies as good as ∼22µas. Distances to these sources are 2.57+0.34–0.27kpc for ON1, 0.776+0.104–0.083kpc for L1206, 0.929+0.034–0.033kpc for L1287, 2.38+0.13–0.12kpc for NGC281-W, and 1.59+0.07–0.06kpc for S255. The distances and proper motions yield the full space motions of the star-forming regions hosting the masers, and we find that these regions lag circular rotation on average by ∼17km/s, a value comparable to those found recently by similar studies.

Abstract Copyright: ∼

Journal keyword(s): techniques: interferometric - astrometry - masers - stars: formation - ISM: molecules - Galaxy: kinematics and dynamics

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ICRF J003525.3+613030 QSO 00 35 25.31057789 +61 30 30.7611949           ~ 12 0
2 LDN 1287 DNe 00 36 47.5 +63 29 02           ~ 90 0
3 GM 1-33 HH 00 36 47.5 +63 29 02           ~ 120 0
4 IRAS 00420+5530 Y*? 00 44 57.31 +55 47 18.1           ~ 58 0
5 ICRF J004700.4+565742 BLL 00 47 00.42882470 +56 57 42.3945344       18.9   ~ 55 1
6 NGC 281 HII 00 52 25.1 +56 33 54           ~ 242 1
7 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1026 2
8 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
9 M 42 HII 05 35 17 -05 23.4           ~ 4074 0
10 4C 22.12 BLL 06 03 51.55701163 +21 59 37.6988226           ~ 40 1
11 ICRF J060643.5-072430 QSO 06 06 43.54633848 -07 24 30.2311559       19.40   ~ 27 0
12 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
13 NGC 2175 OpC 06 09 39 +20 29.2   7.0 6.8     ~ 261 3
14 SH 2-257 HII 06 12 43.57 +17 59 33.1           ~ 129 1
15 MMB G192.600-00.048 Y*O 06 12 54.0100 +17 59 23.200           ~ 400 0
16 IC 2162 HII 06 13 04.1 +17 58 44           ~ 358 2
17 NVSS J061336+170825 Rad 06 13 36.36008547 +17 08 24.9461742           ~ 23 1
18 QSO J0613+1306 QSO 06 13 57.69275201 +13 06 45.4008349       19.5   ~ 56 1
19 LBN 196.49-01.60 HII 06 14 38.3 +13 49 41           ~ 166 1
20 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1178 0
21 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
22 NVSS J200330+303430 Rad 20 03 30.24405437 +30 34 30.7886003           ~ 24 1
23 [KCW94] 069.540-00.975 HII 20 10 09.0 +31 31 35           ~ 168 1
24 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 171 0
25 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 188 0
26 ICRF J222318.0+624933 Bz? 22 23 18.09663229 +62 49 33.8051074           ~ 22 1
27 LDN 1206 DNe 22 28 52.2 +64 13 43           ~ 66 0
28 IRAS 22272+6358A Cld 22 28 52.2 +64 13 43           ~ 51 0
29 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 738 2
30 NAME Local Arm reg ~ ~           ~ 537 0

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