2013A&A...558A..81B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST13:44:12

2013A&A...558A..81B - Astronomy and Astrophysics, volume 558A, 81-81 (2013/10-1)

Fragmentation, infall, and outflow around the showcase massive protostar NGC 7538 IRS 1 at 500AU resolution.

BEUTHER H., LINZ H. and HENNING Th.

Abstract (from CDS):

Revealing the fragmentation, infall, and outflow processes in the immediate environment around massive young stellar objects is crucial for understanding the formation of the most massive stars. With this goal in mind we present the so far highest spatial-resolution thermal submm line and continuum observations toward the young high-mass protostar NGC7538IRS1. Using the Plateau de Bure Interferometer in its most extended configuration at 843µm wavelength, we achieved a spatial resolution of 0.2"x0.17", corresponding to ∼500AU at a distance of 2.7kpc. For the first time, we have observed the fragmentation of the dense inner core of this region with at least three subsources within the inner 3000AU. The outflow exhibits blue- and red-shifted emission on both sides of the central source, indicating that the current orientation has to be close to the line-of-sight, which differs from other recent models. We observe rotational signatures in northeast-southwest direction; however, even on scales of 500AU, we do not identify any Keplerian rotation signatures. This implies that during the early evolutionary stages any stable Keplerian inner disk has to be very small (≤500)AU). The high-energy line HCN(4-3)v2=1 (E-u/k=1050K) is detected over an extent of approximately 3000AU. In addition to this, the detection of red-shifted absorption from this line toward the central dust continuum peak position allows us to estimate infall rates of ∼ 1.8x10–3M/yr on the smallest spatial scales. Although all that gas will not necessarily be accreted onto the central protostar, nevertheless, such inner core infall rates are among the best proxies of the actual accretion rates one can derive during the early embedded star formation phase. These data are consistent with collapse simulations and the observed high multiplicity of massive stars.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: early-type - stars: individual: NGC 7538 IRS 1 - stars: massive

VizieR on-line data: <Available at CDS (J/A+A/558/A81): list.dat maps/*>

Simbad objects: 7

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Number of rows : 7

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 QSO B0016+73 QSO 00 19 45.7863740 +73 27 30.017554     19.0 18.26   ~ 273 1
2 7C 0059+5808 QSO 01 02 45.76238248 +58 24 11.1366009   20.09 19.22 18.57 17.90 ~ 189 1
3 RAFGL 490 Y*O 03 27 38.7928323987 +58 47 00.017662871           ~ 339 0
4 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2702 2
5 NGC 7538S Y*O 23 13 44.8 +61 26 51           ~ 73 1
6 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 367 3
7 ICRF J232225.9+505751 QSO 23 22 25.98218320 +50 57 51.9636985       18.6   ~ 57 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-13:44:12

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