2009AJ....137.4127T

Query : 2009AJ....137.4127T

2009AJ....137.4127T - Astron. J., 137, 4127-4139 (2009/May-0)

The intermediate-mass embedded cluster GM 24 revisited: new infrared and radio observations.

TAPIA M., RODRIGUEZ L.F., PERSI P., ROTH M. and GOMEZ M.

Abstract (from CDS):

New and archived high-resolution infrared (IR; 1-20 µm) and radio-continuum images of the isolated embedded cluster and associated compact H II region, GM 24, are presented and measured photometrically. The nucleus of the complex is Irs 3, or IRAS 17136-3617, located at the densest part of the molecular cloud. This object is composed of at least three compact near-IR sources (A, B, and C) that are the most luminous and massive young stellar components and provide most of the ionizing energy to the cometary-shaped radio H II region. The 3.6 cm radio map shows a complex structure with an extended emission peak and two very compact components very close to Irs 3A. Large inhomogeneities in the dust density within the nebula cause considerably different morphologies in the observed emission of hydrogen recombination lines, namely Paβ, Brγ, and Brα. No H2 line emission at 2.12 µm was detected. The embedded IR cluster is found to contain more than 100 members within a radius of around 40'', which corresponds to 0.39 pc. The total stellar mass is estimated to be ≥250 M☉. The extinction to the nearby edge of the cluster is determined to be AV= 13, though a number of sources, including Irs 3, are reddened by AV> 50. A fraction of near-IR sources, mainly in the periphery of the cluster, are main-sequence A-B-type stars, while a large fraction (∼50%) of the detected members show significant IR excesses, including several Class I young stellar objects with luminosities ranging from a few solar luminosities near our sensitivity limit, to 1.5 x105 L☉, the derived luminosity of Irs 3.

Abstract Copyright: ∼

Journal keyword(s): H II regions - ISM: individual: GM 24 - open clusters and associations: general - stars: formation

Nomenclature: Table 2: [TRL91] IRS NNNW N=53 among (Nos 8-614). Table 3: [TRL91] IRS NN N=30 among (Nos 1-69), [TRP2009] IRS NN (Nos 36, 60). Fig. 13: [TRL91] IRS NA (Nos 3A-3C).

CDS comments: Table 3: sources IRS 36 and IRS 60 are [TRP2009] IRS 36 and 60 in SIMBAD respectively, because these ids are already used in Table 2 for different sources.

Simbad objects: 96

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Number of rows : 96
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
2 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 1004 0
3 GRS G350.60 +00.90 HII 17 16.9 -36 21           ~ 14 0
4 [TRP2009] IRS 36 * 17 16 57.88 -36 21 00.1           ~ 1 0
5 2MASS J17165813-3621208 * 17 16 58.14 -36 21 20.9           ~ 1 0
6 [TRL91] IRS 553 IR 17 16 58.81 -36 20 31.7           ~ 1 0
7 2MASS J17165902-3620176 NIR 17 16 59.03 -36 20 17.6           ~ 1 0
8 [TRL91] IRS 64 Y*O 17 16 59.04 -36 21 11.4           ~ 1 0
9 [TRL91] IRS 483 Y*O 17 16 59.36 -36 20 46.2           ~ 1 0
10 [TRL91] IRS 37 * 17 16 59.56 -36 20 59.1           ~ 1 0
11 [TRL91] IRS 129 Y*O 17 16 59.58 -36 21 41.9           ~ 1 0
12 2MASS J17165963-3621087 Y*O 17 16 59.64 -36 21 08.7           ~ 2 0
13 [TRL91] IRS 339 Y*O 17 16 59.69 -36 21 06.6           ~ 1 0
14 2MASS J17165981-3621515 NIR 17 16 59.7953569728 -36 21 51.699384972           ~ 1 0
15 [TRL91] IRS 94 Y*O 17 16 59.86 -36 21 48.8           ~ 1 0
16 [TRL91] IRS 251 Y*O 17 16 59.97 -36 21 18.6           ~ 1 0
17 [TRL91] IRS 195 IR 17 17 00.00 -36 21 28.2           ~ 1 0
18 2MASS J17170008-3621367 Y*O 17 17 00.08 -36 21 36.7           ~ 1 0
19 [TRL91] IRS 614 IR 17 17 00.27 -36 20 16.1           ~ 1 0
20 2MASS J17170039-3621021 NIR 17 17 00.394 -36 21 02.16           ~ 2 0
21 2MASS J17170053-3620442 Y*O 17 17 00.5254616232 -36 20 44.192817708           ~ 2 0
22 2MASS J17170066-3621087 Y*O 17 17 00.667 -36 21 08.76           ~ 2 0
23 NAME GM 1-24 IRS 14 * 17 17 00.77 -36 20 58.5           ~ 2 0
24 [TRL91] IRS 459 Y*O 17 17 00.79 -36 20 50.6           ~ 1 0
25 NAME GM 1-24 IRS 16 * 17 17 00.96 -36 20 56.7           M 2 0
26 [TRL91] IRS 496 IR 17 17 01.00 -36 20 43.3           ~ 1 0
27 [TRL91] IRS 21 IR 17 17 01.07 -36 21 03.3           ~ 2 0
28 [TRL91] IRS 304 Y*O 17 17 01.22 -36 21 11.2           ~ 1 0
29 NAME GM 1-24 IRS 4 Y*O 17 17 01.60 -36 20 57.8           ~ 2 0
30 NAME GM 1-24 IRS 20 Y*O 17 17 01.66 -36 21 11.0           ~ 2 0
31 NAME GM 1-24 IRS 9 Y*O 17 17 01.70 -36 21 08.9           ~ 2 0
32 NAME GM 1-24 IRS 12 IR 17 17 01.78 -36 20 56.9           ~ 2 0
33 2MASS J17170178-3621477 NIR 17 17 01.7784446640 -36 21 47.691398376           ~ 1 0
34 2MASS J17170178-3620485 Y*O 17 17 01.78 -36 20 48.5           ~ 2 0
35 [TRL91] IRS 458 IR 17 17 01.79 -36 20 50.8           ~ 1 0
36 [TRL91] IRS 441 IR 17 17 01.88 -36 20 53.5           ~ 1 0
37 NAME GM 1-24 IRS 11S * 17 17 01.94 -36 21 05.1           ~ 2 0
38 2MASS J17170195-3620238 Y*O 17 17 01.95 -36 20 23.9           ~ 1 0
39 [TRL91] IRS 11N IR 17 17 01.99 -36 21 04.0           ~ 2 0
40 [DBS2003] 122 Cl* 17 17 02 -36 21.0           ~ 7 0
41 [TRL91] IRS 448 IR 17 17 02.04 -36 20 51.9           ~ 1 0
42 NAME GM 1-24 IRS 22 Y*? 17 17 02.09 -36 21 09.4           M 2 0
43 [TRL91] IRS 199 IR 17 17 02.10 -36 21 27.7           ~ 1 0
44 NAME GM 1-24 IRS 23 Y*O 17 17 02.20 -36 21 07.0           ~ 2 0
45 [TRL91] IRS 41 IR 17 17 02.24 -36 21 57.9           ~ 1 0
46 [TRL91] IRS 3A Y*O 17 17 02.29 -36 21 08.2           ~ 1 0
47 [TRL91] IRS 3C Y*O 17 17 02.30 -36 21 09.6           ~ 1 0
48 NAME GM 1-24 IRS 3 Y*O 17 17 02.31 -36 21 08.8           ~ 3 0
49 [TRL91] IRS 3B Y*O 17 17 02.33 -36 21 09.2           ~ 1 0
50 [TRL91] IRS 389 Y*O 17 17 02.34 -36 20 59.8           ~ 1 0
51 [TRL91] IRS 50 Y*O 17 17 02.39 -36 20 38.7           ~ 1 0
52 NAME GM 1-24 IRS 8 * 17 17 02.40 -36 21 02.7           ~ 2 0
53 2MASS J17170248-3620164 Y*O 17 17 02.48 -36 20 16.5           ~ 2 0
54 NAME GM 1-24 IRS 27 Y*O 17 17 02.49 -36 21 14.3           ~ 3 0
55 NAME GM 1-24 IRS 24 Y*O 17 17 02.53 -36 21 05.6           ~ 2 0
56 [TRL91] IRS 51 Y*O 17 17 02.60 -36 20 36.1           ~ 1 0
57 [TRL91] IRS 555 IR 17 17 02.67 -36 20 31.7           ~ 1 0
58 NAME GM 1-24 IRS 15 * 17 17 02.69 -36 20 58.5           ~ 2 0
59 [TRL91] IRS 53 Y*O 17 17 02.70 -36 21 55.5           ~ 1 0
60 [TRL91] IRS 39 Y*O 17 17 02.7 -36 20 56           ~ 1 0
61 [TRL91] IRS 427 Y*O 17 17 02.74 -36 20 55.3           ~ 1 0
62 [TRL91] IRS 36 Y*O 17 17 02.78 -36 21 58.6           ~ 1 0
63 [TRL91] IRS 266 Y*O 17 17 02.92 -36 21 16.6           ~ 1 0
64 [TRL91] IRS 126 Y*O 17 17 02.93 -36 21 42.1           ~ 1 0
65 NAME GM 1-24 IRS 17 Y*O 17 17 02.94 -36 20 49.0           ~ 2 0
66 [TRL91] IRS 60 Y*O 17 17 03.01 -36 21 54.6           ~ 1 0
67 [TRL91] IRS 491 Y*O 17 17 03.03 -36 20 44.7           ~ 1 0
68 [TRL91] IRS 472 Y*O 17 17 03.13 -36 20 48.5           ~ 1 0
69 NAME GM 1-24 IRS 18 Y*O 17 17 03.25 -36 20 45.4           ~ 2 0
70 [TRL91] IRS 240 Y*O 17 17 03.30 -36 21 21.2           ~ 1 0
71 NAME GM 1-24 IRS 19 Y*O 17 17 03.50 -36 20 44.8           ~ 2 0
72 [TRL91] IRS 250 Y*O 17 17 03.58 -36 21 18.8           ~ 1 0
73 [TRL91] IRS 370 Y*O 17 17 03.88 -36 21 03.1           ~ 1 0
74 GM 1-24 HII 17 17 04.0 -36 21 14           ~ 61 0
75 [TRL91] IRS 34 Y*O 17 17 04.1 -36 21 03           ~ 1 0
76 [TRL91] IRS 434 Y*O 17 17 04.20 -36 20 54.2           ~ 1 0
77 [TRL91] IRS 47 Y*O 17 17 04.34 -36 20 43.5           ~ 1 0
78 [TRL91] IRS 65 IR 17 17 04.43 -36 21 23.2           ~ 1 0
79 [TRL91] IRS 57 * 17 17 04.49 -36 20 39.9           ~ 1 0
80 [TRL91] IRS 201 IR 17 17 04.71 -36 21 27.5           ~ 1 0
81 2MASS J17170490-3621449 Y*O 17 17 04.90 -36 21 45.0           ~ 1 0
82 2MASS J17170503-3621042 * 17 17 05.03 -36 21 04.3           ~ 1 0
83 [TRL91] IRS 533 IR 17 17 05.11 -36 20 35.2           ~ 1 0
84 [TRL91] IRS 482 Y*O 17 17 05.41 -36 20 46.5           ~ 1 0
85 [TRL91] IRS 35 IR 17 17 05.48 -36 21 00.6           ~ 1 0
86 [TRL91] IRS 396 IR 17 17 05.63 -36 20 58.8           ~ 1 0
87 [TRL91] IRS 489 Y*O 17 17 05.66 -36 20 45.1           ~ 1 0
88 [TRL91] IRS 509 Y*O 17 17 05.72 -36 20 40.8           ~ 1 0
89 2MASS J17170589-3620540 Y*O 17 17 05.89 -36 20 54.1           ~ 1 0
90 [TRL91] IRS 514 IR 17 17 06.40 -36 20 39.7           ~ 1 0
91 [TRL91] IRS 593 IR 17 17 06.46 -36 20 23.9           ~ 1 0
92 [TRL91] IRS 200 Y*O 17 17 06.55 -36 21 27.7           ~ 1 0
93 [TRL91] IRS 348 Y*O 17 17 06.70 -36 21 06.1           ~ 1 0
94 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 373 0
95 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 165 1
96 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

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