2011A&A...533A..47S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.15CET19:55:03

2011A&A...533A..47S - Astronomy and Astrophysics, volume 533A, 47-47 (2011/9-1)

The properties and polarization of the H2O and CH3OH maser environment of NGC 7538-IRS1.

SURCIS G., VLEMMINGS W.H.T., TORRES R.M., VAN LANGEVELDE H.J. and HUTAWARAKORN KRAMER B.

Abstract (from CDS):

NGC7538 is a complex massive star-forming region. The region is composed of several radio continuum sources, one of which is IRS1, a high-mass protostar, from which a 0.3pc molecular bipolar outflow was detected. Several maser species have been detected around IRS1. The CH3OH masers have been suggested to trace a Keplerian-disk, while the H2O masers are almost aligned to the outflow. More recent results suggested that the region hosts a torus and potentially a disk, but with a different inclination than the Keplerian-disk that is supposed to be traced by the CH3OH masers. Tracing the magnetic field close to protostars is fundamental for determining the orientation of the disk/torus. Recent studies showed that during the protostellar phase of high-mass star formation the magnetic field is oriented along the outflows and around or on the surfaces of the disk/torus. The observations of polarized maser emissions at milliarcsecond resolution can make a crucial contribution to understanding the orientation of the magnetic field and, consequently, the orientation of the disk/torus in NGC7538-IRS1. The NRAO Very Long Baseline Array was used to measure the linear polarization and the Zeeman-splitting of the 22GHz H2O masers toward NGC7538-IRS1. The European VLBI Network and the MERLIN telescopes were used to measure the linear polarization and the Zeeman-splitting of the 6.7GHz CH3OH masers toward the same region. We detected 17 H2O masers and 49 CH3OH masers at high angular resolution. We detected linear polarization emission toward two H2O masers and toward twenty CH3OH masers. The CH3OH masers, most of which only show a core structure, seem to trace rotating and potentially infalling gas in the inner part of a torus. Significant Zeeman-splitting was measured in three CH3OH masers. No significant (3σ) magnetic field strength was measured using the H2O masers. We also propose a new description of the structure of the NGC7538-IRS1 maser region.

Abstract Copyright:

Journal keyword(s): stars: formation - masers - polarization - magnetic fields - ISM: individual objects: NGC 7538

Simbad objects: 10

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Number of rows : 10

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 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3600 3
2 NAME Per Arm PoG 03 30 +45.0           ~ 1286 0
3 4C 50.11 QSO 03 59 29.74726473 +50 57 50.1615765           ~ 399 1
4 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3811 2
5 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 362 1
6 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 198 0
7 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 703 2
8 ICRF J230241.3+640552 Bz? 23 02 41.31499697 +64 05 52.8488544           ~ 31 1
9 NGC 7538 OpC 23 13 37 +61 30.0           ~ 833 0
10 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 371 3

    Equat.    Gal    SGal    Ecl

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2021.01.15-19:55:03

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