2012MNRAS.419.1860D

Query : 2012MNRAS.419.1860D

2012MNRAS.419.1860D - Mon. Not. R. Astron. Soc., 419, 1860-1870 (2012/January-3)

A newly discovered young massive star cluster at the far end of the Galactic Bar.

DAVIES B., DE LA FUENTE D., NAJARRO F., HINTON J.A., TROMBLEY C., FIGER D.F. and PUGA E.

Abstract (from CDS):

We present a near-infrared study of the candidate star cluster Mercer 81, located at the centre of the G338.4+0.1 H II region and close to the TeV gamma-ray source HESS 1640-465. Using Hubble Space Telescope/NICMOS imaging and VLT/ISAAC spectroscopy, we have detected a compact and highly reddened cluster of stars, although the bright stars in the centre of the field are in fact foreground objects. The cluster contains nine stars with strong Pα emission, one of which we identify as a Wolf-Rayet (WR) star, as well as an A-type supergiant. The line-of-sight extinction is very large, AV ∼ 45, illustrating the challenges of locating young star clusters in the Galactic plane. From a quantitative analysis of the WR star, we argue for a cluster age of 3.7+0.4–0.5 Myr, and, assuming that all emission-line stars are WR stars, a cluster mass of ≳ 104 M☉. A kinematic analysis of the cluster's surrounding H II region shows that the cluster is located in the Galactic disc at a distance of 11±2 kpc. This places the cluster close to where the far end of the Bar intersects the Norma spiral arm. This cluster, as well as the nearby cluster [DBS2003]179, represents the first detections of active star cluster formation at this side of the Bar, in contrast to the near side which is well known to have recently undergone a ∼ 106 M☉ starburst episode.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): stars: Wolf-Rayet - ISM: clouds - H {sc ii} regions - open clusters and associations: general - open clusters and associations: individual: Mercer 81

Nomenclature: Table 2: [DDN2012] NN (Nos 1-10).

Simbad objects: 55

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Number of rows : 55
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 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
2 NAME NGC 869/884 OpC 02 20.5 +57 08           ~ 72 0
3 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 951 0
4 [DBS2003] 45 Cl* 10 19 11 -58 02.3           ~ 10 1
5 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 400 0
6 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
7 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
8 [MCM2005b] 30 Cl* 12 14 32.0 -62 58 49           ~ 16 0
9 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
10 Cl Danks 1 OpC 13 12 29.0 -62 41 56           ~ 80 0
11 Cl Danks 2 OpC 13 12 53.3 -62 40 52           ~ 73 0
12 NAME G305 Complex SFR 13 13 -62.7           ~ 72 0
13 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
14 [LBM2006] HESS J1614-518 2 X 16 13 20.40 -51 43 17.0           ~ 2 0
15 [LBM2006] HESS J1614-518 3 X 16 14 01.50 -51 54 25.9           ~ 2 0
16 [LBM2006] HESS J1614-518 1 X 16 14 05.80 -51 52 26.0           ~ 2 0
17 [LBM2006] HESS J1614-518 4 X 16 14 08.80 -51 53 57.9           ~ 2 0
18 [LBM2006] HESS J1614-518 5 X 16 14 48.00 -51 48 30.7           ~ 2 0
19 GAL 338.4+00.2 HII 16 40 09 -46 22.0           ~ 3 0
20 2MASS J16402832-4623267 * 16 40 28.2648424768 -46 23 26.703919826           ~ 2 0
21 2MASS J16402896-4623276 RR* 16 40 28.96344 -46 23 27.6216         17.829 ~ 4 0
22 2MASS J16402934-4623121 * 16 40 29.34168 -46 23 12.1740           ~ 2 0
23 2MASS J16402934-4623388 * 16 40 29.34408 -46 23 38.8716           ~ 2 0
24 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 26 0
25 2MASS J16402963-4623261 * 16 40 29.63232 -46 23 26.1672           ~ 2 0
26 WR 76-7 * 16 40 29.65 -46 23 29.1           ~ 2 0
27 WR 76-8 * 16 40 29.65 -46 23 28.7           ~ 2 0
28 [DDN2012] 1 * 16 40 29.842 -46 23 34.48           ~ 1 0
29 [DDN2012] 10 * 16 40 30.066 -46 23 24.85           ~ 1 0
30 2MASS J16403007-4623116 * 16 40 30.071 -46 23 11.62           ~ 4 0
31 SNR G338.3-00.0 SNR 16 40 43.2 -46 31 48           ~ 175 2
32 GAL 338.4+00.1 HII 16 40 49.2 -46 24 05           ~ 19 0
33 GAL 338.45+00.06 HII 16 40 53.1 -46 22 41           ~ 11 0
34 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
35 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
36 [DBS2003] 179 OpC 17 11 32.0 -39 10 38           ~ 41 0
37 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
38 NAME 1806-20 Star Cluster OpC 18 08 39.0 -20 24 39           ~ 35 1
39 NAME W 31 IR Cluster Cl* 18 09 27 -20 19.5           ~ 6 0
40 [MFD2008] Stellar Cluster OpC 18 13 24.0 -17 53 31           ~ 17 0
41 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
42 HD 169094 SB* 18 24 52.1906187000 -42 13 44.333042052   7.57 7.57     B9.5V 11 0
43 [MCM2005b] 9 OpC 18 34 08 -09 14.0           ~ 15 0
44 HD 171975 * 18 37 12.6184382664 +11 25 17.425550028 6.320 6.540 6.560     B9V 41 0
45 RSGC 1 OpC 18 37 58 -06 53.0           ~ 117 0
46 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
47 Cl Stephenson 2 OpC 18 39 20 -06 01.7           ~ 102 0
48 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
49 NAME Sgr 1900+14 Star Cluster OpC 19 07 14 +09 19.3           ~ 12 0
50 [MCM2005b] 20 OpC 19 12 25 +09 57.7           ~ 17 0
51 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
52 Teutsch 42 OpC 19 30 13.1 +18 32 09           ~ 21 0
53 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
54 NAME Galactic Bulge reg ~ ~           ~ 4794 0
55 NAME Galactic Bar reg ~ ~           ~ 1458 0

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