2010ApJ...710..583C

Query : 2010ApJ...710..583C

2010ApJ...710..583C - Astrophys. J., 710, 583-596 (2010/February-2)

Four highly luminous massive star-forming regions in the Norma spiral arm. II. Deep near-infrared imaging.

CHAVARRIA L., MARDONES D., GARAY G., ESCALA A., BRONFMAN L. and LIZANO S.

Abstract (from CDS):

We present sensitive near-infrared (J, H, and K) imaging observations toward four luminous massive star-forming regions in the Norma Spiral Arm: G324.201+0.119, G328.307+0.432, G329.337+0.147, and G330.949-0.174. We identify three clusters of young stellar objects (YSOs) based on surface density diagnostics. We also find that sources detected only in the H and K bands and with colors corresponding to spectral types earlier than B2, are likely YSOs. We analyze the spatial distribution of stars of different masses and find signatures in two clusters of primordial mass segregation that cannot be explained as due to incompleteness effects. We show that dynamic interactions of cluster members with the dense gas from the parent core can explain the observed mass segregation, indicating that the gas plays an important role in the dynamics of young clusters.

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Journal keyword(s): H II regions - infrared: stars - stars: early-type - stars: formation - stars: luminosity function, mass function - stars: pre-main sequence

Nomenclature: Fig. 7, Table 5: [CMG2010] GLLL.lllA N=5.

Simbad objects: 20

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Number of rows : 20
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 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
2 LBN 192.48-00.21 HII 06 11 59 +18 03.3           ~ 93 0
3 NAME S254-258 complex SFR 06 12 48.0 +17 59 00           ~ 22 0
4 SH 2-258 HII 06 13 28 +17 55.5           ~ 75 0
5 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 356 0
6 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 306 0
7 [CMG2010] G324.201B As* 15 32 49.30 -55 55 58.2           ~ 1 0
8 IRAS 15290-5546 HII 15 32 52.654 -55 56 10.63           ~ 19 0
9 [CMG2010] G324.201A As* 15 32 52.80 -55 56 15.7           ~ 1 0
10 [CMG2010] G328.307A As* 15 54 06.50 -53 11 39.9           ~ 1 0
11 [CMG2010] G328.307B As* 15 54 06.60 -53 12 02.0           ~ 1 0
12 IRAS 15502-5302 HII 15 54 07.2 -53 11 20           ~ 46 0
13 NAME Nor Arm PoG 16 00 -50.0           ~ 430 0
14 IRAS 15567-5236 HII 16 00 32.9 -52 44 45           ~ 29 0
15 [CMG2010] G329.337 As* 16 00 33.10 -52 44 45.6           ~ 2 0
16 IRAS 16060-5146 HII 16 09 52.776 -51 54 52.20           ~ 33 0
17 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1615 0
18 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1055 0
19 NAME Cyg X FIR 36 Rad 20 39 01.6 +42 22 47           ~ 118 1
20 NGC 7538 OpC 23 13 37 +61 30.0           ~ 881 1

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