Query : 2013A&A...559L...2P

2013A&A...559L...2P - Astronomy and Astrophysics, volume 559, L2-2 (2013/11-1)

Unveiling the circumstellar environment toward a massive young stellar object.


Abstract (from CDS):

As a continuation of a previous work, in which we found strong evidence of massive molecular outflows toward a massive star-forming site, we present a new study of this region based on very high angular resolution observations with the aim of discovering the outflow-driven mechanism.Using near-IR data acquired with Gemini-NIRI at the broad H- and Ks-bands, we studied a region of 22"x22" around the UCHii region G045.47+0.05, a massive-star forming site at a distance of about 8 kpc. To image the source with the highest spatial resolution possible we employed the adaptative optics system ALTAIR, achieving an angular resolution of about 0.15". We discovered a cone shaped nebula that has an opening angle of about 90° and extends eastward of the IR source 2MASS J19142564+1109283, which is very likely a massive young stellar object (MYSO). This morphology suggests a cavity that was cleared in the circumstellar material, and its emission may arise from scattered continuum light, warm dust, and probably also from emission lines from shock-excited gas. The nebula, which presents arc-like features, is connected with the IR source through a jet-like structure, which is aligned with the blueshifted CO outflow found in a previous study. The near-IR structure lies ∼3" north of the radio continuum emission, revealing that it is not spatially coincident with the UCHii region. The observed morphology and structure of the near-IR nebula strongly suggest the presence of a precessing jet. We resolved the circumstellar environment (in scale of a thousand AU) of a distant MYSO, indeed one of the farthest currently known.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: jets and outflows - HII regions

VizieR on-line data: <Available at CDS (J/A+A/559/L2): list.dat fits/*>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 198 0
2 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 139 0
3 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 154 1
4 EGO G045.47+0.05 of? 19 14 25.6 +11 09 28           ~ 14 0
5 2MASS J19142564+1109283 NIR 19 14 25.644 +11 09 28.30           ~ 5 0

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