2011ApJ...730...55P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET01:37:51

2011ApJ...730...55P - Astrophys. J., 730, 55 (2011/March-3)

The Arecibo methanol maser galactic plane survey. IV. Accurate astrometry and source morphologies.

PANDIAN J.D., MOMJIAN E., XU Y., MENTEN K.M. and GOLDSMITH P.F.

Abstract (from CDS):

We present accurate absolute astrometry of 6.7 GHz methanol masers detected in the Arecibo Methanol Maser Galactic Plane Survey using MERLIN and the Expanded Very Large Array (EVLA). We estimate the absolute astrometry to be accurate to better than 15 and 80 mas for the MERLIN and EVLA observations, respectively. We also derive the morphologies of the maser emission distributions for sources stronger than ∼1 Jy. The median spatial extent along the major axis of the regions showing maser emission is ∼775 AU. We find a majority of methanol maser morphologies to be complex with some sources previously determined to have regular morphologies in fact being embedded within larger structures. This suggests that some maser spots do not have a compact core, which leads to them being resolved in high angular resolution observations. This also casts doubt on interpretations of the origin of methanol maser emission solely based on source morphologies. We also investigate the association of methanol masers with mid-infrared emission and find very close correspondence between methanol masers and 24 µm point sources. This adds further credence to theoretical models that predict methanol masers to be pumped by warm dust emission and firmly reinforces the finding that Class II methanol masers are unambiguous tracers of embedded high-mass protostars.

Abstract Copyright:

Journal keyword(s): astrometry - instrumentation: high angular resolution - masers - stars: formation

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 931 2
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3470 3
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3630 1
4 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 790 1
5 NVSS J185146+003532 Rad 18 51 46.72295 +00 35 32.3649           ~ 53 1
6 NVSS J185631+061017 Rad 18 56 31.83887710 +06 10 16.7646823           ~ 14 1
7 ICRF J190711.9+012708 QSO 19 07 11.9988607394 +01 27 09.018074966           ~ 29 1
8 W 49n HII 19 10 13.2 +09 06 12           ~ 403 3
9 NVSS J192218+084157 Rad 19 22 18.63362 +08 41 57.3718           ~ 15 1
10 GB6 B1920+1524 Rad 19 22 34.69927882 +15 30 10.0322171           ~ 33 0
11 NAME W 51 Main reg 19 23 43.8 +14 30 37           ~ 129 0
12 W 51 SNR 19 23 50 +14 06.0           ~ 1122 1
13 ICRF J192439.4+154043 Bz? 19 24 39.45588 +15 40 43.9420           ~ 29 1
14 ICRF J192559.6+210626 QSO 19 25 59.60535560 +21 06 26.1620442           ~ 173 1
15 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 360 3

    Equat.    Gal    SGal    Ecl

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2019.12.14-01:37:51

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