2002A&A...394..253N


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET19:51:59

2002A&A...394..253N - Astronomy and Astrophysics, volume 394, 253-269 (2002/10-4)

The molecular environment of NGC 3603. I. Spatial distribution and kinematic structure.

NUERNBERGER D.E.A., BRONFMAN L., YORKE H.W. and ZINNECKER H.

Abstract (from CDS):

We present CS(21-and) CS(32-observations) of the molecular gas associated with the Galactic starburst template NGC 3603, over an area of 5.8'x16.7', with the OB cluster at the center. Total velocity integrated maps and channel maps give insight into the spatial distribution and the kinematic structure of the dense gas in the giant molecular cloud from which the starburst cluster originated. We identify 13 molecular clumps with radii less than 0.8pc and derive upper limits for their virial masses as well as lower limits for their H2 column densities: <Mvir>≲(1.0±0.6)x103M and <N(H2)≫(0.4±0.2)x1023cm–2. One of the clumps, MM11, clearly stands out with a mass and column density 4 times higher than average. The CS(32-)/CS(21-map) shows higher intensity ratios to the south of the OB cluster than to the north (0.80±0.08 versus 0.32±0.11), which indicates a substantial difference in the physical conditions (either opacities or excitation temperatures) of the molecular gas. From the average of the line peak velocities, 14.2±1.6km/s, we deduce a kinematic distance of 7.7±0.2kpc for NGC 3603. We estimate the star formation efficiency (>30%) of the central part of the NGC 3603 H II region. If we assume the age of the OB cluster to be less than 3Myr and the star formation rate to be larger than 1.3x10–3M/yr, the derived timescale for gas removal (τ∼6Myr) can explain why the starburst cluster itself is nearly void of interstellar material. The remnant clump MM 1 appears to constitute the head of a prominent pillar which still becomes dispersed by ionizing radiation and stellar winds originating from the massive stars of the cluster. Because some of the molecular clumps are associated with near and mid infrared sources as well as OH, H2O and CH3OH maser sources we conclude that star formation is still going on within NGC 3603.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - H II regions - ISM: individual objects: NGC 3603 - ISM: kinematics and dynamics - ISM: structure

Nomenclature: Table 2: [NBY2002] MM NN (Nos 1-14). Fig.8: [NBY2002] MM 2A (Nos 2A-2E).

Simbad objects: 38

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Number of rows : 38

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15187 1
2 M 42 HII 05 35 17.3 -05 23 28           ~ 3774 0
3 NAME Ori A MoC 05 38 -07.1           ~ 2733 0
4 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1059 2
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1773 1
6 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 230 0
7 NAME Car Arm PoG 10 00 -60.0           ~ 385 1
8 V* R Crt AB* 11 00 33.8541158313 -18 19 29.574953304   10.33 9.80     M7/8III 200 0
9 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 229 2
10 PN G291.4-00.3 PN 11 14 31.9 -61 00 03           ~ 5 0
11 [NBY2002] MM 13 MoC 11 14 45.3 -61 08 25           ~ 4 0
12 [NBY2002] MM 10 MoC 11 14 52.9 -61 10 05           ~ 1 0
13 [NBY2002] MM 6 MoC 11 14 58.4 -61 13 45           ~ 3 0
14 [NBY2002] MM 8 MoC 11 14 58.4 -61 11 15           ~ 5 0
15 [NBY2002] MM 12 MoC 11 14 59.8 -61 08 25           ~ 5 0
16 [NBY2002] MM 1 MoC 11 15 02.6 -61 15 55           ~ 6 0
17 [NBY2002] MM 7 MoC 11 15 04.7 -61 12 55           ~ 6 0
18 [NBY2002] MM 11 MoC 11 15 06.8 -61 09 45           ~ 6 0
19 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   WR 184 2
20 NAME Sher 25 star * 11 15 07.6444076894 -61 15 17.608695337   13.63 12.27     B1.5Iab 73 1
21 [NBY2002] MM 2E MoC 11 15 08.2 -61 16 55           ~ 3 0
22 NGC 3603 18 s*b 11 15 08.7086321627 -61 15 59.955437768 13.57 13.67 12.51     O3.5If* 17 0
23 [NBY2002] MM 2D MoC 11 15 09.5 -61 17 20           ~ 1 0
24 [NBY2002] MM 2F MoC 11 15 09.5 -61 16 15           ~ 1 0
25 NGC 3603 23 * 11 15 09.8441156734 -61 15 30.489833787 13.51 13.75 12.65     OC9.7Ia 16 0
26 [NBY2002] MM 2A MoC 11 15 10.3 -61 16 55           ~ 1 0
27 [NBY2002] MM 5 MoC 11 15 10.9 -61 21 55           ~ 1 0
28 [NBY2002] MM 2C MoC 11 15 10.9 -61 17 35           ~ 1 0
29 [NBY2002] MM 3B MoC 11 15 11.6 -61 18 15           ~ 1 0
30 [NBY2002] MM 2 MoC 11 15 11.87 -61 17 00.6           ~ 12 0
31 [NBY2002] MM 2B MoC 11 15 12.4 -61 17 10           ~ 1 0
32 [NBY2002] MM 4 MoC 11 15 13.0 -61 20 20           ~ 3 0
33 [NBY2002] MM 3 MoC 11 15 15.1 -61 19 25           ~ 2 0
34 TYC 8959-1919-1 * 11 15 15.1636 -61 17 34.849           ~ 1 0
35 [NBY2002] MM 14 MoC 11 15 17.2 -61 15 45           ~ 1 0
36 [NBY2002] MM 9 MoC 11 15 17.9 -61 10 30           ~ 4 0
37 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 970 1
38 GRS G291.86 -00.68 HII 11 16 33.8 -61 29 59           ~ 20 0

    Equat.    Gal    SGal    Ecl

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