2002ApJ...570..688I


Query : 2002ApJ...570..688I

2002ApJ...570..688I - Astrophys. J., 570, 688-696 (2002/May-2)

Spatial distribution of dust grains within H II regions.

INOUE A.K.

Abstract (from CDS):

We discuss the dust distribution within photoionized regions. Assuming a geometry with a central dust cavity, which is strongly suggested by the literature, we can estimate the cavity radius from the ratio of the infrared and radio fluxes by using a simple transfer model of Lyman continuum photons. We apply the method to a sample of the Galactic H II regions. The estimated typical radius of the dust cavity of the Galactic compact H II regions is about 30% of the Strömgren radius. Taking into account uncertainties in both the observational data and the model, we can reject a dust distribution lacking a central cavity. Therefore, the dust cavity model is supported independently of the previous works. We discuss the formation mechanism of such a dust cavity and its detectability by present and future infrared facilities.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - ISM: H II Regions - Infrared: ISM - Radiative Transfer - Submillimeter

CDS comments: table 1 : HII regions W 31B4, NGC 3603P1 and NGC 3603P2 not identified

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 234 2
2 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1032 1
3 [GS70] 298.2-00.3 HII 12 10 01.886 -62 50 00.46           ~ 66 1
4 GAL 333.6-00.2 HII 16 22 11 -50 05.6           ~ 144 0
5 NAME Sgr D HII HII 17 48 41.79 -28 01 41.3           ~ 65 1
6 W 31 SFR 18 10 28.6 -19 55 51           ~ 252 0
7 GAL 023.95+00.16 HII 18 34 23.8 -07 54 53           ~ 15 0
8 GAL 025.38-00.18 HII 18 38 14 -06 47.6           ~ 37 0
9 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 360 0
10 GAL 045.5+00.0 HII 19 14 20.8 +11 09 04           ~ 139 0
11 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 154 1
12 NAME W 51 IRS 1 HII 19 23 41.9 +14 30 36           ~ 107 0
13 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 169 1

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2023.01.28-12:17:14

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