2009A&A...500..817B


Query : 2009A&A...500..817B

2009A&A...500..817B - Astronomy and Astrophysics, volume 500, 817-826 (2009/6-3)

The broad hα, [OIII] line wings in stellar supercluster a of NGC2363 and the turbulent mixing layer hypothesis.

BINETTE L., DRISSEN L., UBEDA L., RAGA A.C., ROBERT C. and KRONGOLD Y.

Abstract (from CDS):

Supercluster A in the extragalactic HII region NGC2363 is remarkable for the hypersonic gas seen as faint extended broad emission lines with a full-width zero intensity of 7000km/s. We explore the possibility that the observed broad profiles are the result of the interaction of a high-velocity cluster wind with dense photoionized clumps.The geometry considered is that of near static photoionized condensations at the surface of which turbulent mixing layers arise as a result of the interaction with the hot wind. The approximative treatment of turbulence was carried out using the mixing length approach of Canto & Raga (1991ApJ...372..646C). The code mappings ic was used to derive the mean quantities describing the flow and to compute the line emissivities within the turbulent layers. The velocity projection in three dimensions of the line sources was carried out analytically. A fast entraining wind of up to ≃4300km/s appears to be required to reproduce the faint wings of the broad Hα and [OIII] profiles. A slower wind of 3500km/s, however, can still reproduce the bulk of the broad component and does provide a better fit than an adhoc Gaussian profile. Radial acceleration in 3D (away from supercluster A) of the emission gas provides a reasonable first-order fit to the broad line component. No broad component is predicted for the [NII] and [SII] lines, as observed. The wind velocity required is uncomfortably high and alternative processes that would provide comparable constant acceleration of the emission gas up to 4000km/s might have to be considered.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - line: profiles - turbulence - stars: winds, outflows - stars: formation - galaxies: clusters: general

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1592 2
2 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1196 3
3 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 253 1
4 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 552 3
5 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 731 0
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5585 6

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2022.05.27-01:47:19

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