2015A&A...584A...2F


Query : 2015A&A...584A...2F

2015A&A...584A...2F - Astronomy and Astrophysics, volume 584A, 2-2 (2015/12-1)

KMOS view of the Galactic centre. I. Young stars are centrally concentrated.

FELDMEIER-KRAUSE A., NEUMAYER N., SCHOEDEL R., SETH A., HILKER M., DE ZEEUW P.T., KUNTSCHNER H., WALCHER C.J., LUETZGENDORF N. and KISSLER-PATIG M.

Abstract (from CDS):

The Galactic centre hosts a crowded, dense nuclear star cluster with a half-light radius of 4pc. Most of the stars in the Galactic centre are cool late-type stars, but there are also >100 hot early-type stars in the central parsec of the Milky Way. These stars are only 3-8Myr old. Our knowledge of the number and distribution of early-type stars in the Galactic centre is incomplete. Only a few spectroscopic observations have been made beyond a projected distance of 0.5pc of the Galactic centre. The distribution and kinematics of early-type stars are essential to understand the formation and growth of the nuclear star cluster. We cover the central 4pc2 (0.75arcmin2) of the Galactic centre using the integral-field spectrograph KMOS (VLT). We extracted more than 1000 spectra from individual stars and identified early-type stars based on their spectra. Our data set contains 114 bright early-type stars: 6 have narrow emission lines, 23 are Wolf-Rayet stars, 9 stars have featureless spectra, and 76 are O/B type stars. Our wide-field spectroscopic data confirm that the distribution of young stars is compact, with 90% of the young stars identified within 0.5pc of the nucleus. We identify 24 new O/B stars primarily at large radii. We estimate photometric masses of the O/B stars and show that the total mass in the young population is >12000M. The O/B stars all appear to be bound to the Milky Way nuclear star cluster, while less than 30% belong to the clockwise rotating disk. We add one new star to the sample of stars affiliated with this disk. The central concentration of the early-type stars is a strong argument that they have formed in situ. An alternative scenario, in which the stars formed outside the Galactic centre in a cluster that migrated to the centre, is refuted. A large part of the young O/B stars is not on the disk, which either means that the early-type stars did not all form on the same disk or that the disk is dissolving rapidly.

Abstract Copyright:

Journal keyword(s): Galaxy: center - stars: early-type - stars: emission-line, Be - stars: Wolf-Rayet

VizieR on-line data: <Available at CDS (J/A+A/584/A2): table2.dat table3.dat tableb1.dat tableb2.dat tableb3.dat sp/* spectra.fits>

Nomenclature: Table 2: [FNS2015] NNNNN N=29 among (Nos 9-25346). Table 3: [FNS2015] NNNNN N=9 among (Nos 88-25347). Tables B1-B3 : [FNS2015] NNNNN N=29 among (Nos 64-11652).

Simbad objects: 134

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Number of rows : 134
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 NGC 404 LIN 01 09 27.1 +35 43 05   12.56 11.73     ~ 424 0
2 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 4.90 4.41 OBepec 2278 0
3 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
4 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1041 1
5 [DB2002b] G359.94+0.17 DNe 17 44 49 -28 54.2           ~ 6 0
6 [FNS2015] 982 * 17 45 38.350 -29 00 36.58           OB 1 0
7 [FNS2015] 2048 * 17 45 39.221 -29 00 37.99           OB 1 0
8 [FNS2015] 1103 * 17 45 39.221 -29 00 31.25           OB 1 0
9 [FNS2015] 3308 * 17 45 39.274 -29 00 41.52           OB 1 0
10 [PGM2006] E81 WR* 17 45 39.30 -29 00 30.7           WN7 10 0
11 [NS2013] 24 * 17 45 39.353 -29 00 33.90           OB 2 0
12 [NS2013] 21 * 17 45 39.360 -29 00 31.63           OB 2 0
13 [BSD96] 22 WR* 17 45 39.38 -29 00 33.4           WC8/9 27 0
14 [FNS2015] 617 * 17 45 39.396 -29 00 34.34           OB 1 0
15 [FNS2015] 958 * 17 45 39.396 -29 00 31.54           OB 1 0
16 NAME Sgr A West HII 17 45 39.4 -29 00 24           ~ 356 0
17 [FNS2015] 3773 * 17 45 39.413 -29 00 30.87           ~ 1 0
18 [FNS2015] 728 * 17 45 39.420 -29 00 31.08           OB 1 0
19 [FNS2015] 1935 * 17 45 39.442 -29 00 23.91           OB 1 0
20 [PGM2006] -7.76+1.36 * 17 45 39.449 -29 00 26.73           OB 2 0
21 [BSD96] 29 WR* 17 45 39.46 -29 00 31.7           WN8 28 0
22 [FNS2015] 1554 * 17 45 39.470 -29 00 29.82           OB 1 0
23 [FNS2015] 11652 * 17 45 39.478 -29 00 27.82           OB 1 0
24 [FNS2015] 838 * 17 45 39.492 -29 00 24.59           OB 1 0
25 [NS2013] 25 * 17 45 39.499 -29 00 36.13           OB 2 0
26 [BSD96] 33 WR* 17 45 39.54 -29 00 35.0           Ofpe/WN9 39 0
27 [FNS2015] 936 * 17 45 39.550 -29 00 35.61           OB 1 0
28 [FNS2015] 722 * 17 45 39.574 -29 00 39.06           OB 1 0
29 [FNS2015] 973 * 17 45 39.574 -29 00 30.05           OB 1 0
30 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12299 0
31 [FNS2015] 1134 * 17 45 39.617 -29 00 33.69           OB 1 0
32 [FNS2015] 1327 * 17 45 39.617 -29 00 29.44           OB 1 0
33 GCIRS 34 WR* 17 45 39.632 -29 00 27.05           ~ 20 0
34 [PGM2006] E60 WR* 17 45 39.7085 -29 00 29.723           WN7? 18 0
35 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 54 0
36 GCIRS 7SW WR* 17 45 39.74 -29 00 23.3           WN8 15 0
37 [SME2009] 766 * 17 45 39.7410 -29 00 33.626           ~ 2 0
38 GCIRS 34NW WR* 17 45 39.749 -29 00 25.36           WN7 18 0
39 [FNS2015] 209 * 17 45 39.770 -29 00 35.68           OB 1 0
40 GCIRS 2L * 17 45 39.778 -29 00 32.11           ~ 22 0
41 GCIRS 3 * 17 45 39.80 -29 00 23.9           ~ 142 0
42 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 40 0
43 [PGM2006] E53 s*b 17 45 39.8320 -29 00 30.914           B0/1I 4 0
44 [PGM2006] E45 s*b 17 45 39.8433 -29 00 30.167           O9/B0I 3 0
45 [FNS2015] 718 * 17 45 39.859 -29 00 36.73           OB 1 0
46 GCIRS 7W WR* 17 45 39.86 -29 00 22.2           WC9 36 0
47 GCIRS 3E WR* 17 45 39.869 -29 00 24.32           WC5/6 16 0
48 [FNS2015] 1350 * 17 45 39.902 -29 00 33.73           OB 1 0
49 [GEO97] W7 V* 17 45 39.9150 -29 00 27.958           O9/9.5III? 15 0
50 [FNS2015] 1534 * 17 45 39.917 -29 00 29.82           ~ 1 0
51 [RGH2007] GEN-1.70-1.65 * 17 45 39.917 -29 00 29.82           O-B 9 0
52 GCIRS 29N WR* 17 45 39.917 -29 00 26.71           WC9 53 0
53 [GEO97] W14 WR* 17 45 39.9190 -29 00 28.592           O8.5/9.5I? 17 0
54 GCIRS 15SW WR* 17 45 39.92 -29 00 18.1           WN8/WC9 35 0
55 [PGM2006] E43 s*b 17 45 39.9206 -29 00 30.877           O8.5/9.5I 6 0
56 [GEO97] W10 * 17 45 39.9393 -29 00 28.416           O8/9.5I/III 19 0
57 [PGM2006] E77 * 17 45 39.9454 -29 00 18.922           O9/B0V 3 0
58 [PGM2006] E52 * 17 45 39.9460 -29 00 24.453           O8/9III 3 0
59 [PGM2006] E73 s*b 17 45 39.9591 -29 00 20.440           O9/B:I 4 0
60 GCIRS 29NE1 WR* 17 45 39.9643 -29 00 26.021           WC8/9 32 0
61 [GEO97] W9 * 17 45 39.9832 -29 00 28.366           O9.5/B2V 19 0
62 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 353 0
63 [GEO97] W11 * 17 45 39.9935 -29 00 28.975           OB 16 0
64 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3683 3
65 GCIRS 33N s*b 17 45 40.0381 -29 00 30.302           B0.5/1I 36 0
66 [PGM2006] E75 s*b 17 45 40.0404 -29 00 19.539           O9/B:I 4 0
67 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 304 1
68 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 128 0
69 [PGM2006] E84 s*b 17 45 40.0484 -29 00 17.834           O9/B:I 4 0
70 [EG97] S14 * 17 45 40.050 -29 00 28.05           B4/9V 73 0
71 [GKM98] S4-287 * 17 45 40.0506 -29 00 32.875           OB 6 0
72 [GKM98] S2-74 * 17 45 40.052 -29 00 25.34           O-B 6 0
73 [EG97] S67 * 17 45 40.0727 -29 00 27.214           O-B 30 0
74 [GKM98] S2-19 s?b 17 45 40.0743 -29 00 25.787           O9/B0I? 13 0
75 GCIRS 16S WR* 17 45 40.09 -29 00 29.8           ~ 11 0
76 [NS2013] 18 * 17 45 40.092 -29 00 37.48           OB 2 0
77 GCIRS 33E WR* 17 45 40.0941 -29 00 31.213           Ofpe/WN9 52 0
78 GCIRS 16SSW s*b 17 45 40.0967 -29 00 29.711           O8/9.5I 15 0
79 [GKM98] S4-71 s?b 17 45 40.1004 -29 00 32.164           B0/1I? 8 0
80 [GKM98] S1-4 * 17 45 40.1044 -29 00 28.766           O-B 10 0
81 [PGM2006] E71 WR* 17 45 40.11 -29 00 22.4           WC8/9? 9 0
82 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 172 1
83 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 147 0
84 GCIRS 8 * 17 45 40.14 -28 59 58.7           O 72 0
85 [GKM98] S2-17 s*b 17 45 40.1401 -29 00 29.974           B0.5/1I 17 0
86 GCIRS 15NE WR* 17 45 40.15 -29 00 16.5           WN8/9 54 0
87 [FNS2015] 853 * 17 45 40.152 -29 00 39.45           OB 1 0
88 [FNS2015] 716 * 17 45 40.159 -29 00 35.36           OB 1 0
89 GCIRS 16SSE1 s*b 17 45 40.1649 -29 00 29.441           O8.5/9.5I 14 0
90 [PGM2006] E47 s*b 17 45 40.1685 -29 00 31.057           B0/3I 6 0
91 GCIRS 16SE1 WR* 17 45 40.181 -29 00 29.26           WC8/9 41 0
92 [PGM2006] E69 * 17 45 40.1812 -29 00 34.424           ~ 4 0
93 GCIRS 16CC s*b 17 45 40.1939 -29 00 27.532           O9.5/B0.5I 51 0
94 [PGM2006] E62 s*b 17 45 40.2097 -29 00 23.607           B0/3I 3 0
95 [BSD96] 86 * 17 45 40.250 -29 00 30.66           ~ 3 0
96 GCIRS 9W WR* 17 45 40.26 -29 00 33.7           WN8 28 0
97 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 42 0
98 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 143 0
99 [PMM2001] B9 WR* 17 45 40.2673 -29 00 24.628           WC9 16 1
100 [FNS2015] 974 * 17 45 40.277 -29 00 33.05           OB 1 0
101 GCIRS 16SE3 s*b 17 45 40.2963 -29 00 29.238           O8.5/9.5I 5 0
102 GCIRS 9SW WR* 17 45 40.3689 -29 00 36.154           WC9 10 0
103 [PGM2006] E70 WR* 17 45 40.3794 -29 00 23.125           Ofpe/WN9 11 0
104 [GKM98] S5-183 * 17 45 40.3935 -29 00 31.540           OB 5 0
105 [FNS2015] 596 * 17 45 40.409 -29 00 33.65           OB 1 0
106 [FNS2015] 610 * 17 45 40.438 -29 00 35.22           OB 1 0
107 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 99 0
108 [NS2013] 12 * 17 45 40.452 -29 00 25.16           OB 2 0
109 GCIRS 9SE WR* 17 45 40.4723 -29 00 36.299           WC9 12 0
110 [GKM98] S5-231 * 17 45 40.4845 -29 00 28.034           ~ 6 0
111 GCIRS 1E s*b 17 45 40.5268 -29 00 27.863           B1/3I 13 0
112 GCIRS 10W * 17 45 40.5305 -29 00 23.001           ~ 45 0
113 [FNS2015] 721 * 17 45 40.570 -29 00 22.95           OB 1 0
114 [FNS2015] 3578 * 17 45 40.598 -29 00 34.72           OB 1 0
115 GCIRS 5 * 17 45 40.700 -29 00 18.51           ~ 55 0
116 [FNS2015] 436 * 17 45 40.723 -29 00 11.36           OB 1 0
117 [GKM98] S9-15 * 17 45 40.7283 -29 00 27.703           OB 3 0
118 GCIRS 5S IR 17 45 40.738 -29 00 20.31           ~ 4 0
119 [OEG99] 180 WR* 17 45 40.76 -29 00 27.8           WC9 14 0
120 [GKM98] S9-11 * 17 45 40.7606 -29 00 27.074           OB 4 0
121 [PGM2006] E85 * 17 45 40.7814 -29 00 23.673           OB 3 0
122 GCIRS 5SE1 IR 17 45 40.856 -29 00 21.36           ~ 6 0
123 [FNS2015] 890 * 17 45 40.862 -29 00 24.91           OB 1 0
124 GCIRS 5SE IR 17 45 40.870 -29 00 21.48           ~ 4 0
125 GCIRS 5E IR 17 45 40.875 -29 00 18.96           ~ 6 0
126 GCIRS 5SE2 IR 17 45 40.887 -29 00 21.56           ~ 4 0
127 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 458 2
128 GCIRS 5NE IR 17 45 41.020 -29 00 17.66           ~ 5 0
129 [FNS2015] 2446 * 17 45 41.038 -29 00 13.84           OB 1 0
130 GCIRS 5E2 IR 17 45 41.056 -29 00 18.24           ~ 2 0
131 [FNS2015] 1104 * 17 45 41.242 -29 00 15.25           OB 1 0
132 [FNS2015] 3339 * 17 45 41.537 -29 00 28.57           OB 1 0
133 [FNS2015] 663 * 17 45 41.683 -29 00 09.13           OB 1 0
134 GCIRS 7E2 * ~ ~           ~ 13 0

    Equat.    Gal    SGal    Ecl

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2021.07.25-02:25:41

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