2013A&A...551A..18E


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.27CET01:04:44

2013A&A...551A..18E - Astronomy and Astrophysics, volume 551A, 18-18 (2013/3-1)

Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic center.

ECKART A., MUZIC K., YAZICI S., SABHA N., SHAHZAMANIAN B., WITZEL G., MOSER L., GARCIA-MARIN M., VALENCIA-S. M., JALALI B., BREMER M., STRAUBMEIER C., RAUCH C., BUCHHOLZ R., KUNNERIATH D. and MOULTAKA J.

Abstract (from CDS):

There are a number of faint compact infrared excess sources in the central stellar cluster of the Milky Way. Their nature and origin is unclear. In addition to several isolated objects of this kind there is a small but dense cluster of comoving sources (IRS13N) located ∼3'' west of SgrA* just 0.5'' north of the bright IRS13E cluster of Wolf-Rayet and O-type stars. Based on the analysis of their color and brightness, there are two main possibilities: (1) they may be dust-embedded stars older than a few Myr; or (2) very young, dusty stars with ages younger than 1Myr. We present a first Ks-band identification and proper motions of the IRS13N members, the high-velocity dusty S-cluster object (DSO, also referred to as G2), and other infrared excess sources in the central field. Goal is to constrain the nature of these source. The L'-(3.8µm)Ks-(2.2µm) and H-band (1.65µm) observations were carried out using the NACO adaptive optics system at the ESO VLT. Proper motions were obtained by linear fitting of the stellar positions extracted by StarFinder as a function of time, weighted by positional uncertainties, and by Gaussian fitting from high-pass filtered and deconvolved images. We also present results of near-infrared (NIR) H- and Ks-band ESO-SINFONI integral field spectroscopy of the Galactic center cluster ISR13N. We show that within the uncertainties, the positions and proper motions of the IRS13N sources in Ks- and L'-band are identical. The HK-sL' colors then indicate that the bright L'-band IRS13N sources are indeed dust-enshrouded stars rather than core-less dust clouds. The proper motions also show that the IRS13N sources are not strongly gravitationally bound to each other. Combined with their NIR colors, this implies that they have been formed recently. For the DSO we obtain proper motions and a Ks-L'-color. Most of the compact L'-band excess emission sources have a compact H- or Ks-band counterpart and therefore are likely stars with dust shells or disks. Our new results and orbital analysis from our previous work favor the hypothesis that the infrared excess IRS13N members and other dusty sources close to SgrA* are young dusty stars and that star formation at the Galactic center (GC) is a continuously ongoing process. For the DSO the color information indicates that it may be a dust cloud or a dust-embedded star.

Abstract Copyright:

Journal keyword(s): Galaxy: center - stars: early-type - infrared: stars

Nomenclature: Fig. 2, Table 3: [EMY2013] NN (Nos 1-33).

CDS comments: S54, 56, 79 and 90 are not in Simbad (no coordinates).

Simbad objects: 41

goto Full paper

goto View the reference in ADS

Number of rows : 41

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 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 93 0
2 GCIRS 13 Em* 17 45 39.76 -29 00 29.8           ~ 124 0
3 GCIRS 13E5 IR 17 45 39.780 -29 00 29.65           ~ 11 0
4 GCIRS 13E4 WR* 17 45 39.7974 -29 00 29.503           WC9 25 0
5 [ZMG2009] K21 Cld 17 45 39.80 -29 00 28.4           ~ 1 0
6 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 39 0
7 GCIRS 13E3 ** 17 45 39.8038 -29 00 29.627           ~ 25 1
8 [EMV2004] zet IR 17 45 39.808 -29 00 28.75           ~ 3 0
9 [EMV2004] eta IR 17 45 39.811 -29 00 28.61           ~ 3 0
10 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 34 0
11 [EMV2004] gam IR 17 45 39.813 -29 00 28.95           ~ 3 0
12 [EMV2004] kap IR 17 45 39.814 -29 00 28.81           ~ 2 0
13 GCIRS 13E1 s*b 17 45 39.8166 -29 00 29.730           B0/1I 30 0
14 [EMV2004] eps IR 17 45 39.825 -29 00 28.97           ~ 3 0
15 [EMV2004] del IR 17 45 39.826 -29 00 28.81           ~ 3 0
16 [EMV2004] bet IR 17 45 39.827 -29 00 29.18           ~ 2 0
17 [ZMG2009] K23 Cld 17 45 39.83 -29 00 28.9           ~ 1 0
18 [EMV2004] alf IR 17 45 39.844 -29 00 29.42           ~ 2 0
19 [MES2007] X3 ? 17 45 39.85 -29 00 30.5           ~ 12 0
20 GCIRS 7W WR* 17 45 39.86 -29 00 22.2           WC9 35 0
21 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 338 0
22 [EG97] S50 * 17 45 40.00 -29 00 28.6           ~ 13 0
23 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 296 0
24 [EG97] S19 * 17 45 40.0298 -29 00 28.628           K-M 26 0
25 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3348 3
26 NAME G2 Dust Cloud IR 17 45 40.04 -29 00 28.1           ~ 158 0
27 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11257 0
28 [EG97] S17 ** 17 45 40.04250 -29 00 27.7964           ~ 32 0
29 [EG97] S2 *i* 17 45 40.0442 -29 00 27.975           B0/2V 262 1
30 [EG97] S14 * 17 45 40.050 -29 00 28.05           B4/9V 69 0
31 [EG97] S4 * 17 45 40.0636 -29 00 27.968           B0/2V 43 0
32 GCIRS 7SE * 17 45 40.2638 -29 00 24.703           ~ 19 0
33 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 621 0
34 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1471 0
35 [EG97] S63 * ~ ~           ~ 3 0
36 [EG97] S43 * ~ ~           ~ 4 0
37 [EG97] S40 * ~ ~           ~ 2 0
38 [EG97] S23 * ~ ~           ~ 4 0
39 [EG97] S20 * ~ ~           ~ 4 0
40 GCIRS 13E6 * ~ ~           O5V 6 0
41 [EG97] S57 * ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2013A&A...551A..18E and select 'bookmark this link' or equivalent in the popup menu


2020.02.27-01:04:44

© Université de Strasbourg/CNRS

    • Contact