2016ApJ...824L..13D


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST08:32:13

2016ApJ...824L..13D - Astrophys. J., 824, L13-L13 (2016/June-2)

The discovery of Raman scattering in H II regions.

DOPITA M.A., NICHOLLS D.C., SUTHERLAND R.S., KEWLEY L.J. and GROVES B.A.

Abstract (from CDS):

We report here on the discovery of faint extended wings of Hα observed out to an apparent velocity of ∼7600 km/s in the Orion Nebula (M42) and in five H ii regions in the Large and the Small Magellanic Clouds. We show that these wings are caused by Raman scattering of both the O i and Si ii resonance lines and stellar continuum UV photons with H i followed by radiative decay to the H i n=2 level. The broad wings also seen in Hβ and in Hγ result from Raman scattering of the UV continuum in the H i n=4 and n=5 levels, respectively. The Raman scattering fluorescence is correlated with the intensity of the narrow permitted lines of O i and Si ii. In the case of Si ii, this is explained by radiative pumping of the same 1023.7 Å resonance line involved in the Raman scattering by the Lyβ radiation field. The subsequent radiative cascade produces enhanced Si ii λλ5978.9, 6347.1, and 6371.4 Å permitted transitions. Finally, we show that in O i, radiative pumping of the 1025.76 Å resonance line by the Lyman series radiation field is also the cause of the enhancement in the permitted lines of this species lying near Hα in wavelength, but here the process is a little more complex. We argue that all these processes are active in the zone of the H ii region near the ionization front.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): atomic processes - H ii regions - line: formation - Magellanic Clouds - radiation mechanisms: thermal - ultraviolet: ISM

Status at CDS:  

Simbad objects: 21

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Number of rows : 21

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9382 1
2 NGC 456 HII 01 13 44.4 -73 17 26           ~ 113 0
3 LHA 115-N 88A HII 01 24 07.823 -73 09 03.77   13.25 12.18     ~ 69 1
4 HD 9051 PM* 01 28 46.5026523997 -24 20 25.443519152   9.73 8.92     G6/8IIIwF5 51 0
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5612 1
6 HD 25631 * 04 03 24.7475273918 -20 08 37.668205077   6.271 6.450     B3V 65 0
7 HD 31128 PM* 04 52 09.9097489102 -27 03 50.940327190   9.55 9.14     F3/5Vw 119 0
8 LHA 120-N 81A HII 04 52 47.5 -69 12 58           ~ 13 1
9 HD 32340 Em* 04 57 16.253 -66 23 20.94   13.11 12.45 14.00   O3-O6V 77 0
10 LHA 120-N 191 EmO 05 04 37.3 -70 54 31           ~ 9 0
11 HD 33540 * 05 04 38.126 -70 54 41.79   12.73 12.74 13.89 13.48 O/B2:e 38 0
12 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14744 1
13 IC 418 PN 05 27 28.2060343141 -12 41 50.282659007   9.78 13.0     O7fp 997 2
14 HH 202 HH 05 35 11.5 -05 22 46           ~ 66 4
15 M 42 HII 05 35 17.3 -05 23 28           ~ 3711 0
16 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 250 1
17 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 229 1
18 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 755 1
19 HD 200654 Pe* 21 06 34.7513502011 -49 57 50.282535600   9.74 9.11     CEMP 90 0
20 HD 205705 * 21 37 37.6734185242 -19 13 51.656504405   7.36 7.44     B8V 16 0
21 HD 213155 * 22 30 15.7451044439 -42 17 27.848458018   6.875 6.916     B9.5V 33 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-08:32:13

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