2019A&A...626A..70S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:25:57

2019A&A...626A..70S - Astronomy and Astrophysics, volume 626A, 70-70 (2019/6-1)

Carbon radio recombination lines from gigahertz to megahertz frequencies towards Orion A.

SALAS P., OONK J.B.R., EMIG K.L., PABST C., TORIBIO M.C., ROTTGERING H.J.A. and TIELENS A.G.G.M.

Abstract (from CDS):


Context. The combined use of carbon radio recombination lines (CRRLs) and the 158µm-[CII] line is a powerful tool for the study of the energetics and physical conditions (e.g., temperature and density) of photodissociation regions (PDRs). However, there are few observational studies that exploit this synergy.
Aims. Here we explore the relation between CRRLs and the 158µm-[CII] line in light of new observations and models.
Methods. We present new and existing observations of CRRLs in the frequency range 0.15-230 GHz with ALMA, VLA, the GBT, Effelsberg 100m, and LOFAR towards Orion A (M 42). We complement these observations with SOFIA observations of the 158µm-[CII] line. We studied two PDRs: the foreground atomic gas, known as the Veil, and the dense PDR between the HII region and the background molecular cloud.
Results. In the Veil we are able to determine the gas temperature and electron density, which we use to measure the ionization parameter and the photoelectric heating efficiency. In the dense PDR, we are able to identify a layered PDR structure at the surface of the molecular cloud to the south of the Trapezium cluster. There we find that the radio lines trace the colder portion of the ionized carbon layer, the C+/C/CO interface. By modeling the emission of the 158µm-[CII] line and CRRLs as arising from a PDR we derive a thermal pressure >5x107K/cm3 and a radiation field G0~=105 close to the Trapezium.
Conclusions. This work provides additional observational support for the use of CRRLs and the 158µm-[CII] line as complementary tools to study dense and diffuse PDRs, and highlights the usefulness of CRRLs as probes of the C+/C/CO interface.

Abstract Copyright: © ESO 2019

Journal keyword(s): photon-dominated region - ISM: clouds - ISM: individual objects: Orion A - radio lines: ISM

Simbad objects: 28

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Number of rows : 28

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 IC 59 RNe 00 57 42.40 +61 04 59.8           ~ 30 1
2 IC 63 HII 00 59 01.37 +60 53 17.8   13.33       ~ 83 1
3 * omi Per ** 03 44 19.13204 +32 17 17.6929 3.13 3.88 3.83 3.71 3.71 B1III 572 0
4 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 813 0
5 NAME Per B AGN 04 37 04.37510272 +29 40 13.8184969   21.7       ~ 470 2
6 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 64 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
8 NGC 1973 BNe 05 35 04.80 -04 43 54.7           ~ 13 0
9 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
10 NGC 1977 SFR 05 35 16.0 -04 49 15           ~ 185 0
11 SH 2-279 HII 05 35.3 -04 47           ~ 16 0
12 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1272 1
13 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1467 1
14 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
15 NGC 1975 BNe 05 35 18.1 -04 41 05           ~ 14 0
16 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
17 * c Ori Y*O 05 35 23.16427 -04 50 18.0881 3.46 4.40 4.59 4.67 4.85 B1V 193 0
18 M 43 HII 05 35 31 -05 16.2           ~ 160 0
19 OMC 4 MoC 05 36 06 -05 35.7           ~ 48 0
20 NAME Ori A MoC 05 38 -07.1           ~ 2675 0
21 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
22 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1266 1
23 LDN 1630 DNe 05 45.5 -00 59           ~ 350 0
24 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
25 2C 553 QSO 06 27 10.1 -05 53 06           ~ 148 1
26 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1724 2
27 * gam Ara Be* 17 25 23.6593111 -56 22 39.814775 2.25 3.21 3.34     B1Ib 256 0
28 NAME Orion's Veil HI ~ ~           ~ 36 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:25:57

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