2015A&A...579A..10R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:16:13

2015A&A...579A..10R - Astronomy and Astrophysics, volume 579A, 10-10 (2015/7-1)

Herschel SPIRE-FTS observations of RCW 120.

RODON J.A., ZAVAGNO A., BALUTEAU J.-P., HABART E., KOEHLER M., LE BOURLOT J., LE PETIT F. and ABERGEL A.

Abstract (from CDS):

The expansion of Galactic HII regions can trigger the formation of a new generation of stars. However, little is know about the physical conditions that prevail in these regions. We study the physical conditions that prevail in specific zones towards expanding HII regions that trace representative media such as the photodissociation region, the ionized region, and condensations with and without ongoing star formation. We use the SPIRE Fourier Transform Spectrometer (FTS) on board Herschel to observe the HII region RCW 120. Continuum and lines are observed in the 190-670µm range. Line intensities and line ratios are obtained and used as physical diagnostics of the gas. We used the Meudon PDR code and the RADEX code to derive the gas density and the radiation field at nine distinct positions including the PDR surface and regions with and without star-formation activity. For the different regions we detect the atomic lines [NII] at 205µm and [CI] at 370 and 609µm, the 12CO ladder between the J=4 and J=13 levels and the 13CO ladder between the J=5 and J=14 levels, as well as CH + in absorption. We find gas temperatures in the range 45-250K for densities of 104-106cm–3, and a high column density on the order of NH∼1022cm–2 that is in agreement with dust analysis. The ubiquitousness of the atomic and CH + emission suggests the presence of a low-density PDR throughout RCW 120. High-excitation lines of CO indicate the presence of irradiated dense structures or small dense clumps containing young stellar objects, while we also find a less dense medium (NH∼1020cm–2) with high temperatures (80-200K).

Abstract Copyright:

Journal keyword(s): ISM: bubbles - HII regions - ISM: individual objects: RCW 120 - photon-dominated region (PDR) - infrared: ISM - submillimeter: ISM

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 - 2020
#notes
1 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 234 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
4 IRAS 17089-3814 OH* 17 12 21.20832 -38 18 20.4588           ~ 9 1
5 SH 2-3 HII 17 12.4 -38 28           ~ 159 1
6 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 630 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:16:13

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