2005A&A...430..481H


Query : 2005A&A...430..481H

2005A&A...430..481H - Astronomy and Astrophysics, volume 430, 481-489 (2005/2-1)

Massive star formation in the W 49 giant molecular cloud: Implications for the formation of massive star clusters.

HOMEIER N.L. and ALVES J.

Abstract (from CDS):

We present results from JHKs imaging of the densest region of the W49 molecular cloud. In a recent paper (Alves & Homeier, 2003ApJ...589L..45A), we reported the detection of (previously unknown) massive stellar clusters in the well-known giant radio HII region W49A, and here we continue our analysis. We use the extensive line-of-sight extinction to isolate a population of objects associated with W49A. We constrain the slope of the stellar luminosity function by constructing an extinction-limited luminosity function, and use this to obtain a mass function. We find no evidence for a top-heavy MF, and the slope of the derived mass function is -1.6±0.3. We identify candidate massive stars from our color-magnitude diagram, and we use these to estimate the current total stellar mass of 5-7x104M in the region of the W49 molecular cloud covered by our survey. Candidate ionizing stars for several ultra-compact HII regions are detected, with many having multipe candidate sources. On the global molecular cloud scale in W49, massive star formation apparently did not proceed in a single concentrated burst, but in small groups, or subclusters. This may be an essential physical description for star formation in what will later be termed a ``massive star cluster''.

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: bubbles - Galaxy: open clusters and associations: individual: W49A - stars: formation - Galaxy: disk - infrared: ISM

Nomenclature: Table 1: [HA2005] JHHMMSS.ss+DDMMSS.s N=25.

Simbad objects: 49

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Number of rows : 49
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 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5320 1
2 NGC 604 HII 01 34 32.1 +30 47 01           ~ 562 0
3 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 99 1
4 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1176 3
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1807 1
6 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 923 2
7 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 229 2
8 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 984 1
9 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 494 0
10 W 31 SFR 18 10 28.6 -19 55 51           ~ 244 0
11 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 104 0
12 [DJW84] W49 Q HII 19 10 10.51 +09 05 11.9           ~ 12 1
13 [HA2005] J191010.76+090518.2 * 19 10 10.76 +09 05 18.2           ~ 1 0
14 2MASS J19101091+0905176 * 19 10 10.91 +09 05 17.6           ~ 1 0
15 [HA2005] J191010.93+090515.9 * 19 10 10.93 +09 05 15.9           ~ 1 0
16 [DJW84] W49 R Rad 19 10 11.06 +09 05 20.2           ~ 8 0
17 2MASS J19101113+0905115 * 19 10 11.13 +09 05 11.5           ~ 1 0
18 2MASS J19101158+0907062 Y*O 19 10 11.58 +09 07 06.3           O3-O7V 6 0
19 2MASS J19101168+0905273 Y*? 19 10 11.69 +09 05 27.3           ~ 2 0
20 [DJW84] W49 CC Rad 19 10 11.72 +09 06 33.5           ~ 5 0
21 [DJW84] W49 S HII 19 10 11.73 +09 05 27.2           ~ 11 1
22 [HA2005] J191011.80+090527.1 * 19 10 11.80 +09 05 27.1           ~ 1 0
23 [HA2005] J191011.83+090528.3 * 19 10 11.83 +09 05 28.3           ~ 1 0
24 [HA2005] J191011.88+090528.2 * 19 10 11.88 +09 05 28.2           ~ 1 0
25 [DJW84] W49 F HII 19 10 13.38 +09 06 21.5           ~ 17 0
26 2MASS J19101340+0906219 AB? 19 10 13.40 +09 06 21.9           ~ 2 0
27 [DJW84] W49 J2 Rad 19 10 14.18 +09 06 26.7           ~ 7 0
28 [HA2005] J191014.22+090627.4 * 19 10 14.22 +09 06 27.4           ~ 1 0
29 W 49a SFR 19 10 15.7 +09 06 05           ~ 267 2
30 2MASS J19101690+0906104 * 19 10 16.91 +09 06 10.4           O5-O7V 2 0
31 [DJW84] W49 O3 Rad 19 10 16.97 +09 06 10.2           ~ 3 0
32 NAME W 49A East Cluster Cl* 19 10 17.439 +09 06 21.11           ~ 7 0
33 W 49 SFR 19 10 20 +09 07.7           ~ 525 1
34 NAME W 49A South HII 19 10 21.6 +09 05 03           ~ 51 2
35 [HA2005] J191021.75+090504.3 * 19 10 21.75 +09 05 04.3           ~ 1 0
36 [HA2005] J191021.80+090503.3 * 19 10 21.80 +09 05 03.3           ~ 1 0
37 [HA2005] J191021.88+090504.3 * 19 10 21.88 +09 05 04.3           ~ 1 0
38 [HA2005] J191021.90+090457.1 * 19 10 21.90 +09 04 57.1           ~ 1 0
39 [HA2005] J191021.90+090458.1 * 19 10 21.90 +09 04 58.1           ~ 1 0
40 [HA2005] J191021.97+090504.2 * 19 10 21.97 +09 05 04.2           ~ 1 0
41 [HA2005] J191022.00+090506.5 * 19 10 22.00 +09 05 06.5           ~ 1 0
42 [HA2005] J191022.02+090500.3 * 19 10 22.02 +09 05 00.3           ~ 1 0
43 [HA2005] J191022.08+090500.0 * 19 10 22.08 +09 05 00.0           ~ 1 0
44 [HA2005] J191022.09+090501.5 * 19 10 22.09 +09 05 01.5           ~ 1 0
45 2MASS J19102215+0905020 * 19 10 22.15 +09 05 02.0           ~ 1 0
46 [HA2005] J191022.20+090504.2 * 19 10 22.20 +09 05 04.2           ~ 1 0
47 [HA2005] J191022.24+090500.3 * 19 10 22.24 +09 05 00.3           ~ 1 0
48 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 831 0
49 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 368 1

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2021.08.01-07:10:44

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