C.D.S. - SIMBAD4 rel 1.7 - 2020.01.26CET13:54:59

2014A&A...563A..39I - Astronomy and Astrophysics, volume 563A, 39-39 (2014/3-1)

The cometary H II regions of DR 21: Bow shocks or champagne flows or both ?


Abstract (from CDS):

We present deep Very Large Array H66α radio recombination line (RRL) observations of the two cometary HII regions in DR21. With these sensitive data, we test the ``hybrid'' bow shock/champagne flow model previously proposed for the DR21 HII regions. The ionized gas down the tail of the southern HII region is redshifted by up to ∼30km/s with respect to the ambient molecular gas, as expected in the hybrid scenario. The RRL velocity structure, however, reveals the presence of two velocity components in both the northern and southern HII regions. This suggests that the ionized gas is flowing along cone-like shells, swept-up by stellar winds. The observed velocity structure of the well-resolved southern HII region is most consistent with a picture that combines a stellar wind with stellar motion (as in bow shock models) along a density gradient (as in champagne flow models). The direction of the implied density gradient is consistent with that suggested by maps of dust continuum and molecular line emission in the DR21 region.

Abstract Copyright:

Journal keyword(s): HII regions - stars: formation - ISM: individual objects: DR21 - ISM: kinematics and dynamics - radio lines: ISM

VizieR on-line data: <Available at CDS (J/A+A/563/A39): list.dat DR21-RRL.fit>

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3649 1
2 QSO J2015+371 BLL 20 15 28.72976962 +37 10 59.5148505     21.82 21.4   ~ 236 2
3 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 935 0

    Equat.    Gal    SGal    Ecl

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