2007ApJ...669.1024M

Query : 2007ApJ...669.1024M

2007ApJ...669.1024M - Astrophys. J., 669, 1024-1041 (2007/November-2)

Evidence for a long-standing top-heavy initial mass function in the central parsec of the galaxy.

MANESS H., MARTINS F., TRIPPE S., GENZEL R., GRAHAM J.R., SHEEHY C., SALARIS M., GILLESSEN S., ALEXANDER T., PAUMARD T., OTT T., ABUTER R. and EISENHAUER F.

Abstract (from CDS):

We classify 329 late-type giants within 1 pc of Sgr A*, using the adaptive optics integral field spectrometer SINFONI on the VLT. These observations represent the deepest spectroscopic data set so far obtained for the Galactic center, reaching a 50% completeness threshold at the approximate magnitude of the helium-burning red clump (KS∼15.5 mag). Combining our spectroscopic results with NaCo H and KSphotometry, we construct an observed Hertzsprung-Russell diagram, which we quantitatively compare to theoretical distributions of various star formation histories of the inner Galaxy, using a χ2 analysis. Our best-fit model corresponds to continuous star formation over the last 12 Gyr with a top-heavy initial mass function (IMF). The similarity of this IMF to the IMF observed for the most recent epoch of star formation is intriguing and perhaps suggests a connection between recent star formation and the stars formed throughout the history of the Galactic center.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Center - Stars: Formation

Simbad objects: 42

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Number of rows : 42
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 * bet Cas dS* 00 09 10.68518 +59 08 59.2120 2.73 2.61 2.27 1.97 1.77 F2III 551 0
2 * del Cas EB* 01 25 48.9514709 +60 14 07.022507 2.930 2.810 2.680 2.53 2.44 A5IV 273 0
3 * tet02 Tau dS* 04 28 39.7416111456 +15 52 15.148738380 3.690 3.600 3.410 5.43   A7III 459 0
4 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1298 2
5 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1925 0
6 * kap Gem ** 07 44 26.8438122013 +24 23 52.787290890 5.19 4.49 3.57 2.86 2.41 G8III-IIIb 308 0
7 * g Gem SB* 07 46 07.4484186384 +18 30 35.993172960 8.09 6.33 4.87 3.72 2.89 K4III 183 0
8 * omi UMa PM* 08 30 15.8701566400 +60 43 05.405606188 4.79 4.27 3.42 2.76 2.31 G5III: 271 1
9 * zet Leo V* 10 16 41.4151642435 +23 25 02.341160368 3.89 3.72 3.41 3.09 2.91 F0IIIa 235 0
10 * mu. UMa SB* 10 22 19.7276765267 +41 29 58.337745272 6.53 4.64 3.05 1.76 0.80 M0III 331 0
11 * bet UMa PM* 11 01 50.4797515135 +56 22 56.761138187 2.35 2.35 2.37 2.31 2.35 A1IVps 462 0
12 * del Leo PM* 11 14 06.50142 +20 31 25.3853 2.79 2.68 2.53 2.44 2.41 A5IV(n) 292 0
13 * ksi UMa A SB* 11 18 10.901164 +31 31 44.97910   4.79 4.25     F8.5:V 320 1
14 * nu. Vir LP* 11 45 51.5595979999 +06 31 45.748996439 7.32 5.54 4.04 2.79 1.78 M1III 267 0
15 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 605 1
16 V* BK Vir AB* 12 30 21.0136448232 +04 24 59.142255840 9.60 8.82 7.28     M7-III: 159 0
17 * 31 Com Ro* 12 51 41.9201696640 +27 32 26.565016812 5.81 5.61 4.94 4.39 4.04 G0IIIp 443 1
18 V* SW Vir AB* 13 14 04.3830437280 -02 48 25.130666916 9.24 8.52 6.85     M7III: 274 0
19 * 20 CVn dS* 13 17 32.5411518092 +40 34 21.384382657   5.010 4.698     A9IImF2 248 0
20 * zet01 UMa SB* 13 23 55.5422805173 +54 55 31.295579890 2.11 2.271 2.220 2.10 2.12 A1.5Vas 320 0
21 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
22 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 457 0
23 * kap Oph LP? 16 57 40.0975028128 +09 22 30.104472450 5.52 4.36 3.20 2.36 1.82 K2III 314 0
24 * eta Oph ** 17 10 22.68689 -15 43 29.6639 2.56 2.47 2.42 2.39 2.38 A2IV-V 271 0
25 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
26 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 387 0
27 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
28 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
29 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 561 0
30 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 581 1
31 * ksi Her LP* 17 57 45.8856741278 +29 14 52.366005079 5.34 4.64 3.70 3.01 2.55 G8.5III 252 0
32 * chi Dra SB* 18 21 03.38255 +72 43 58.2518 4.010 4.070 3.580 3.14 2.83 F7V 420 1
33 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
34 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 919 1
35 * gam Sge PM* 19 58 45.4282303572 +19 29 31.726069716 6.97 5.04 3.47 2.27 1.35 M0-III 276 0
36 * 39 Cyg SB* 20 23 51.6137972268 +32 11 24.481643174 7.27 5.77 4.44 3.43 2.76 K2.5IIIFe-0.5 147 0
37 V* EU Del LP* 20 37 54.7276970976 +18 16 06.894742044 8.42 7.38 5.89 3.24 0.97 M6III 186 0
38 * 11 Cep PM* 21 41 55.3084514088 +71 18 41.267467908       3.9   K0.5III 156 0
39 * iot Cep PM* 22 49 40.8174918750 +66 12 01.458192633 5.50 4.60 3.54 2.69 2.19 K0-III 257 0
40 * ups Peg PM* 23 25 22.7828725585 +23 24 14.762916815 5.15 5.01 4.40 3.86 3.54 F8III 263 0
41 NAME Galactic Bulge reg ~ ~           ~ 4794 0
42 NAME Galactic Bar reg ~ ~           ~ 1458 0

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