2019A&A...631L..12O


Query : 2019A&A...631L..12O

2019A&A...631L..12O - Astronomy and Astrophysics, volume 631, L12-12 (2019/11-1)

First detection of [13C II] in the Large Magellanic Cloud.

OKADA Y., HIGGINS R., OSSENKOPF-OKADA V., GUEVARA C., STUTZKI J. and MERTENS M.

Abstract (from CDS):


Context. [13CII] observations in several Galactic sources show that the fine-structure [12CII] emission is often optically thick (the optical depths around 1 to a few).
Aims. Our goal was to test whether this also affects the [12CII] emission from nearby galaxies like the Large Magellanic Cloud (LMC).
Methods. We observed three star-forming regions in the LMC with upGREAT on board SOFIA at the frequency of the [CII] line. The 4GHz bandwidth covers all three hyperfine lines of [13CII] simultaneously. For the analysis, we combined the [13CII] F=1-0 and F=1-1 hyperfine components as they do not overlap with the [12CII] line in velocity.
Results. Three positions in N159 and N160 show an enhancement of [13CII] compared to the abundance-ratio-scaled [12CII] profile. This is likely due to the [12CII] line being optically thick, supported by the fact that the [13CII] line profile is narrower than [12CII], the enhancement varies with velocity, and the peak velocity of [13CII] matches the [OI] 63 µm self-absorption. The [12CII] line profile is broader than expected from a simple optical depth broadening of the [13CII] line, supporting the scenario of several PDR components in one beam having varying [12CII] optical depths. The derived [12CII] optical depth at three positions (beam size of 14'', corresponding to 3.4 pc) is 1-3, which is similar to values observed in several Galactic sources shown in previous studies.If this also applies to distant galaxies, the [CII] intensity will be underestimated by a factor of approximately 2.

Abstract Copyright: © ESO 2019

Journal keyword(s): ISM: lines and bands - photon-dominated region (PDR) - Magellanic Clouds

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6489 1
2 LHA 120-N 113 HII 05 13 21.7 -69 21 33           ~ 107 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16389 1
4 M 42 HII 05 35 01.5 -05 26 24           ~ 3953 0
5 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 818 0
6 M 43 HII 05 35 31 -05 16.2           ~ 182 0
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1896 1
8 [MMM2008] 30 Dor 1 MoC 05 38 50.8 -69 04 15           ~ 27 0
9 LHA 120-N 159W MoC 05 39 32.510 -69 46 02.74           ~ 87 0
10 NGC 2080 HII 05 39 42.6 -69 38 50           ~ 98 1
11 LHA 120-N 159 HII 05 39 46.650 -69 45 39.94           ~ 269 2
12 LHA 120-N 160 EmO 05 39 47.9 -69 37 08           ~ 113 1
13 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 491 0
14 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1018 1
15 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1567 0
16 NAME Orion's Veil HI ~ ~           ~ 52 0

To bookmark this query, right click on this link: simbad:objects in 2019A&A...631L..12O and select 'bookmark this link' or equivalent in the popup menu


2022.11.29-14:50:21

© Université de Strasbourg/CNRS

    • Contact