2014ApJ...787..107K

Query : 2014ApJ...787..107K

2014ApJ...787..107K - Astrophys. J., 787, 107 (2014/June-1)

The spatial structure of young stellar clusters. I. Subclusters.

KUHN M.A., FEIGELSON E.D., GETMAN K.V., BADDELEY A.J., BROOS P.S., SILLS A., BATE M.R., POVICH M.S., LUHMAN K.L., BUSK H.A., NAYLOR T. and KING R.R.

Abstract (from CDS):

The clusters of young stars in massive star-forming regions show a wide range of sizes, morphologies, and numbers of stars. Their highly subclustered structures are revealed by the MYStIX project's sample of 31,754 young stars in nearby sites of star formation (regions at distances <3.6 kpc that contain at least one O-type star.) In 17 of the regions surveyed by MYStIX, we identify subclusters of young stars using finite mixture models–collections of isothermal ellipsoids that model individual subclusters. Maximum likelihood estimation is used to estimate the model parameters, and the Akaike Information Criterion is used to determine the number of subclusters. This procedure often successfully finds famous subclusters, such as the BN/KL complex behind the Orion Nebula Cluster and the KW-object complex in M 17. A catalog of 142 subclusters is presented, with 1-20 subclusters per region. The subcluster core radius distribution for this sample is peaked at 0.17 pc with a standard deviation of 0.43 dex, and subcluster core radius is negatively correlated with gas/dust absorption of the stars–a possible age effect. Based on the morphological arrangements of subclusters, we identify four classes of spatial structure: long chains of subclusters, clumpy structures, isolated clusters with a core-halo structure, and isolated clusters well fit by a single isothermal ellipsoid.

Abstract Copyright: ∼

Journal keyword(s): H II regions - ISM: structure - methods: statistical - open clusters and associations: general - stars: formation - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJ/787/107): table1.dat table2.dat table3.dat>

Nomenclature: Table 2: [KFG2014] Orion A (Nos A-D), [KFG2014] Flame A (No. A), [KFG2014] W40 A (No. A), [KFG2014] RCW NN A (Nos RCW 36 A-RCW 36 B, RCW 38 A-RCW 38 C), [KFG2014] NGC NNNN A (Nos NGC 1983 A-NGC 1983 J, NGC 2264 A-NGC 2264 M, NGC 2362 A-NGC 2362 B, NGC 6334 A-NGC 6334 N, NGC 6357 A-NGC 6357 F), [KFG2014] Rosette A (Nos A-O), [KFG2014] Lagoon A (Nos A-K), [KFG2014] DR21 A (Nos A-I), [KFG2014] Eagle A (Nos A-L), [KFG2014] M17 A (Nos A-O), [KFG2014] Carina A (Nos A-T), [KFG2014] Trifid A (Nos A-D).

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

Simbad objects: 37

goto Full paper

goto View the references in ADS

Number of rows : 37
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 NGC 869/884 OpC 02 20.5 +57 08           ~ 72 0
2 NGC 1893 OpC 05 22 52.8 +33 26 32           ~ 270 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
6 NAME OMC 1S PoC 05 35 14.5 -05 25 49           ~ 78 1
7 * tet01 Ori C SB* 05 35 16.4662967280 -05 23 22.921811880 4.20 5.15 5.13 4.91 4.73 O7Vp 1479 1
8 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
9 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
10 OMC 2 MoC 05 35 27 -05 10.1           ~ 475 1
11 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
12 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
13 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
14 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
15 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 277 0
16 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
17 NGC 2362 OpC 07 18 41.9 -24 57 08           ~ 428 0
18 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 161 0
19 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
20 NAME Carina Molecular Cloud Complex MoC 10 43 10 -59 38.2           ~ 97 0
21 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
22 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
23 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
24 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
25 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
26 NGC 6357 OpC 17 24 44 -34 12.2           ~ 303 0
27 GAL 353.1+00.6 HII 17 25 37 -34 22.5           ~ 21 0
28 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
29 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
30 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
31 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
32 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
33 MSX5C G014.9957-00.6735 MIR 18 20 19.7 -16 13 31           ~ 37 2
34 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
35 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
36 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
37 NAME Carina Region reg ~ ~           ~ 192 0

To bookmark this query, right click on this link: simbad:objects in 2014ApJ...787..107K and select 'bookmark this link' or equivalent in the popup menu