2016ApJ...821...44F


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET20:51:53

2016ApJ...821...44F - Astrophys. J., 821, 44-44 (2016/April-2)

The nuclear cluster of the Milky Way: total mass and luminosity.

FRITZ T.K., CHATZOPOULOS S., GERHARD O., GILLESSEN S., GENZEL R., PFUHL O., TACCHELLA S., EISENHAUER F. and OTT T.

Abstract (from CDS):

We obtain the basic properties of the nuclear cluster of the Milky Way. First, we investigate the structural properties by constructing a stellar density map of the central 1000'' using extinction-corrected old star counts from VISTA, WFC3/IR, and VLT/NACO data. We describe the data using two components. The inner, slightly flattened (axis ratio of q=0.80 ± 0.04) component is the nuclear cluster, while the outer component corresponds to the stellar component of the circumnuclear zone. For the nuclear cluster, we measure a half-light radius of 178 ± 51'' ∼ 7± 2 pc and a luminosity of MKs=-16.0 ± 0.5. Second, we measure detailed dynamics out to 4 pc. We obtain 10,351 proper motions from AO data, and 2513 radial velocities from VLT/SINFONI data. We determine the cluster mass by means of isotropic spherical Jeans modeling. We fix the distance to the Galactic Center and the mass of the supermassive black hole. We model the cluster either with a constant M/L or with a power law. For the latter case, we obtain a slope of 1.18 ± 0.06. We get a cluster mass within 100'' of M100'' =(6.09 ± 0.53|fixR0 ± 0.97|R0 x 106 M for both modeling approaches. A model which includes the observed flattening gives a 47% larger mass (see Chatzopoulos et al.). Our results slightly favor a core over a cusp in the mass profile. By minimizing the number of unbound stars within 8'', we obtain a distance of R0=8.53–0.15+0.21 kpc when using an R0 supermassive black hole mass relation from stellar orbits. Combining our results, we obtain M/L=0.51 ± 0.12M/L☉,Ks, which is roughly consistent with a Chabrier IMF.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: center - Galaxy: fundamental parameters - proper motions

VizieR on-line data: <Available at CDS (J/ApJ/821/44): table9.dat>

Status in Simbad:  will not be processed

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10705 1
2 NGC 404 LIN 01 09 27.1 +35 43 05   12.56 11.73     ~ 404 0
3 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5069 1
4 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 506 1
5 [SME2009] 5227 * 17 45 39.5261 -29 00 09.708           ~ 2 0
6 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 338 0
7 [EG97] S111 * 17 45 40.0 -29 00 28           ~ 7 0
8 [EG97] S13 * 17 45 40.029 -29 00 28.12           B4/9V 46 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3342 3
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11246 0
11 [EG97] S38 * 17 45 40.04040 -29 00 28.0739           ~ 15 0
12 [EG97] S2 *i* 17 45 40.0442 -29 00 27.975           B0/2V 262 1
13 GCIRS 9 LP* 17 45 40.447 -29 00 34.49           M3III 98 0
14 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 620 0
15 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 435 0
16 [EG97] S55 * ~ ~           ~ 7 0
17 [GKM98] S0-102 * ~ ~           ~ 24 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-20:51:53

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