2011MNRAS.413..705L

Query : 2011MNRAS.413..705L

2011MNRAS.413..705L - Mon. Not. R. Astron. Soc., 413, 705-720 (2011/May-2)

Origins and interpretation of the tridimensional kinematical disorder in H II regions.

LAGROIS D., JONCAS G., DRISSEN L. and ARSENAULT R.

Abstract (from CDS):

Classical spectro-interferometry allowed us to obtain a large-scale Hα survey of the central portions of the late-type Sc galaxy M33. A series of 28 small-to-intermediate size H II regions, kinematically dominated by Champagne flows, quiescent wind effects, potentially embedded globules and filaments, and photoablation flows, are identified and delimited. The main goal of this work is to compare and check for an eventual correlation between two statistical parameters obtained for each targeted object, namely the standard deviation of the velocity centroid distribution (σc) and the mean non-thermal linewidth (#963;_, kin_>). These parameters, by definition, allow for a comparison between the kinematical disorder on the plane of the sky and along the line-of-sight. The slope of the σcversus #963;_, kin_> diagram, approaching unity, indicates that variations of the kinematical disorder are roughly equivalent on all spatial axes. H II regions should therefore be regarded as strictly tridimensional objects. We attempt to reproduce the observed relation using non-turbulent, hydrodynamical models of expanding H II regions. Simulations indicate that the two parameters are generally correlated, as observed, in a monotonically increasing trend although the areas populated in the theoretical σc-#963;_, kin_> space diagram do not match the observations. A certain reconciliation between models and observations is reached if one allows turbulent motions to have a sizeable kinematical impact in the ionized medium, i.e. confirming that all H II regions in the survey have a strong turbulent component. This could apply to all optical nebulae hence in agreement with high Reynolds numbers typically found in the ionized interstellar medium. A photometric investigation of bright stars found in our nebula sample indicates that Champagne-like objects coexist with wind-blown bubbles in the σc versus #963;_, kin_> diagram. This suggests that objects characterized by multiple Champagne flows and those that are wind-dominated can develop turbulent velocity motions of comparable amplitudes.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): line: profiles - techniques: interferometric - H {sc ii} regions - ISM: kinematics and dynamics - galaxies: individual: M33 - galaxies: ISM

Nomenclature: Table 2: [LJD2011] NN (Nos 1-28).

Simbad objects: 35

goto Full paper

goto View the references in ADS

Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11166 1
2 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 122 1
3 [LJD2011] 24 HII 01 33 13.91 +30 44 42.2           ~ 1 0
4 [LJD2011] 25 HII 01 33 14.92 +30 45 12.0           ~ 1 0
5 [LJD2011] 28 HII 01 33 21.74 +30 47 48.6           ~ 1 0
6 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 205 0
7 [LJD2011] 27 HII 01 33 33.91 +30 47 11.8           ~ 1 0
8 [LJD2011] 2 HII 01 33 35.19 +30 32 54.5           ~ 1 0
9 [LJD2011] 7 HII 01 33 36.46 +30 35 32.4           ~ 1 0
10 [LJD2011] 8 HII 01 33 37.43 +30 36 09.0           ~ 1 0
11 [LJD2011] 6 HII 01 33 37.55 +30 34 58.7           ~ 1 0
12 [LJD2011] 18 HII 01 33 42.42 +30 40 56.7           ~ 1 0
13 [LJD2011] 17 HII 01 33 42.42 +30 40 56.7           ~ 1 0
14 [LJD2011] 20 HII 01 33 42.78 +30 41 45.6           ~ 1 0
15 [LJD2011] 21 HII 01 33 44.47 +30 42 48.2           ~ 1 0
16 [LJD2011] 3 HII 01 33 45.01 +30 33 10.1           ~ 1 0
17 [LJD2011] 22 HII 01 33 47.60 +30 43 51.8           ~ 1 0
18 [LJD2011] 4 HII 01 33 48.79 +30 33 56.2           ~ 1 0
19 [LJD2011] 1 HII 01 33 49.55 +30 32 24.9           ~ 1 0
20 [LJD2011] 12 HII 01 33 50.69 +30 37 07.0           ~ 1 0
21 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5845 1
22 [LJD2011] 9 HII 01 33 52.14 +30 36 36.3           ~ 1 0
23 [LJD2011] 15 HII 01 33 55.07 +30 38 03.3           ~ 1 0
24 [LJD2011] 5 HII 01 33 55.23 +30 34 31.1           ~ 1 0
25 [LJD2011] 19 HII 01 33 55.45 +30 41 20.8           ~ 1 0
26 [LJD2011] 11 HII 01 33 55.57 +30 36 51.8           ~ 1 0
27 [LJD2011] 13 HII 01 33 55.72 +30 37 42.7           ~ 1 0
28 [LJD2011] 16 HII 01 33 56.49 +30 38 27.0           ~ 1 0
29 [LJD2011] 23 HII 01 34 00.97 +30 43 55.8           ~ 1 0
30 [LJD2011] 10 HII 01 34 03.19 +30 36 38.7           ~ 1 0
31 [LJD2011] 14 HII 01 34 06.28 +30 37 57.1           ~ 1 0
32 [LJD2011] 26 HII 01 34 08.63 +30 46 37.3           ~ 1 0
33 NGC 604 HII 01 34 32.1 +30 47 01           ~ 586 0
34 M 42 HII 05 35 17 -05 23.4           ~ 4081 0
35 NAME Local Group GrG ~ ~           ~ 8409 0

To bookmark this query, right click on this link: simbad:objects in 2011MNRAS.413..705L and select 'bookmark this link' or equivalent in the popup menu