2017A&A...608A..80E


Query : 2017A&A...608A..80E

2017A&A...608A..80E - Astronomy and Astrophysics, volume 608A, 80-80 (2017/12-1)

OH masers towards IRAS 19092+0841.

EDRIS K.A., FULLER G.A., ETOKA S. and COHEN R.J.

Abstract (from CDS):

Context. Maser emission is a strong tool for studying high-mass star-forming regions and their evolutionary stages. OH masers in particular can trace the circumstellar material around protostars and determine their magnetic field strengths at milliarcsecond resolution.
Aims. We seek to image OH maser emission towards high-mass protostellar objects to determine their evolutionary stages and to locate the detected maser emission in the process of high-mass star formation.
Methods. In 2007, we surveyed OH maser emission towards 217 high-mass protostellar objects to study its presence. In this paper, we present follow-up MERLIN observations of a ground-state OH maser emission towards one of these objects, IRAS 19092+0841.
Results. We detect emissions from the two OH main spectral lines, 1665 and 1667MHz, close to the central object. We determine the positions and velocities of the OH maser features. The masers are distributed over a region of ∼5'' corresponding to 22400AU (or ∼0.1pc) at a distance of 4.48kpc. The polarization properties of the OH maser features are determined as well. We identify three Zeeman pairs from which we inferred a magnetic field strength of ∼4.4mG pointing towards the observer.
Conclusions. The relatively small velocity spread and relatively wide spacial distribution of the OH maser features support the suggestion that this object could be in an early evolutionary state before the presence of disk, jets or outflows.

Abstract Copyright: © ESO, 2017

Journal keyword(s): masers - molecular data - stars: formation - stars: protostars - ISM: individual objects: IRAS 19092+0841 - polarization - polarization

Simbad objects: 8

goto Full paper

goto View the references in ADS

Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 970 2
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3691 3
3 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3932 2
4 IRAS 19092+0841 Rad 19 11 37.4 +08 46 30           ~ 28 0
5 NVSS J192218+084157 Rad 19 22 18.6336599 +08 41 57.376077           ~ 18 1
6 W 51 SNR 19 23 50 +14 06.0           ~ 1193 1
7 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 408 0
8 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 371 1

To bookmark this query, right click on this link: simbad:objects in 2017A&A...608A..80E and select 'bookmark this link' or equivalent in the popup menu


2021.10.26-05:43:32

© Université de Strasbourg/CNRS

    • Contact