2003A&A...412..431A


Query : 2003A&A...412..431A

2003A&A...412..431A - Astronomy and Astrophysics, volume 412, 431-445 (2003/12-3)

A 12CO (J = 1 -> 0) study towards the Ara OB1 region.

ARNAL E.M., MAY J. and ROMERO G.A.

Abstract (from CDS):

Intermediate angular resolution (HPBW=8.7') carbon monoxide (12CO J=1->0) line observations towards the OB association Ara OB1 are reported. The molecular line observations cover an area of 2.75degx3.00deg, and disclose a rich and complex distribution of the molecular line emission. The molecular features likely to be associated with the OB-association Ara OB1 span the velocity range from -28 to -20km/s. The most negative radial velocities are observed along NGC 6188 (=Rim nebula). This nebula marks the interface between the HII region RCW108 and the highly absorbing molecular material located westwards of the ionised region. The dominant CO structures, labeled E and F, have a radial velocity of about -23.5 and -21.8km/s, respectively. The former harbours a bright optical knot, the infrared cluster RCW-108 and the strong IRAS source 16362-4845. IRAS point sources are also seen in projection onto 12CO concentrations F and H. This may indicate that the star forming process is a widespread phenomenon in this molecular complex. Extended continuum emission, having a high degree of spatial correlation with both the infrared and molecular emission, is observed in the region. We believe that this emission, thermal in nature, arises from the ionised surface layers of the molecular complex. The ionising agents are the high mass stars of NGC 6193, the nucleus of Ara OB1. The total amount of molecular gas related to AraOB1 is about ∼1.4x104M.

Abstract Copyright:

Journal keyword(s): HII regions: individual: RCW 108 - ISM: molecules - open clusters and associations: individual: NGC 6193 - open clusters and associations: individual: Ara OB1 - radio continuum: ISM - radio lines: ISM

Nomenclature: Fig.4, Table 1: [AMR2003] A (Nos A-P).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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 - 2024
#notes
1 NGC 6167 OpC 16 34 38.9 -49 45 32   7.58 6.7     ~ 81 0
2 IRAS 16345-4910 IR 16 38 21.8 -49 15 59           ~ 2 0
3 IRAS 16348-4849 IR 16 38 35.3 -48 55 11           ~ 8 0
4 IRAS 16355-4851 * 16 39 20.2846942488 -48 57 16.461062388   12.731 12.213 12.148   ~ 3 0
5 IRAS 16357-4832 Cld 16 39 27.7 -48 38 45           ~ 1 0
6 Ass Ara OB 1 As* 16 39.5 -46 46           ~ 93 0
7 NGC 6188 ISM 16 40 -48.5           ~ 16 0
8 CD-48 11039 * 16 40 00.0882315576 -48 46 58.371343032   11.32 10.92 11.092   B3V 24 0
9 GUM 53 HII 16 40 00.1 -48 51 45           ~ 95 1
10 NAME RCW 108 IR Cluster Cl* 16 40 01 -48 52.0           ~ 13 0
11 IRAS 16365-4836 IR 16 40 16.8 -48 42 24           ~ 5 0
12 NGC 6193 OpC 16 41 16.6 -48 46 37           ~ 158 0
13 HD 150135 * 16 41 19.4443334664 -48 45 47.568769200 6.19 7.00 6.88 7.33   O6.5V((f))z 124 0
14 HD 150136 SB* 16 41 20.4155898816 -48 45 46.730465028 4.98 5.78 5.65 6.93   O3.5-4III(f*)+O6IV 190 0
15 IRAS 16378-4900 IR 16 41 38.4 -49 05 48           ~ 1 0
16 IRAS 16379-4856 IR 16 41 43.6 -49 02 17           ~ 6 0
17 2MASS J16415354-4917520 * 16 41 53.5421165640 -49 17 52.053625356           ~ 3 0
18 IRAS 16382-4904 * 16 42 02.936 -49 09 56.46           ~ 1 0
19 IRAS 16385-4844 IR 16 42 17.2 -48 50 04           ~ 1 0
20 IRAS 16387-4855 mul 16 42 31.7 -49 01 29           ~ 1 0
21 IRAS 16396-4902 Cld 16 43 25.8 -49 08 06           ~ 1 0

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