2010ApJ...721..395F


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST06:34:52

2010ApJ...721..395F - Astrophys. J., 721, 395-411 (2010/September-3)

GC-IRS13E–A puzzling association of three early-type stars.

FRITZ T.K., GILLESSEN S., DODDS-EDEN K., MARTINS F., BARTKO H., GENZEL R., PAUMARD T., OTT T., PFUHL O., TRIPPE S., EISENHAUER F. and GRATADOUR D.

Abstract (from CDS):

We present a detailed analysis of high-resolution near-infrared imaging and spectroscopy of the potential star cluster IRS13E very close to the massive black hole in the Galactic center. We detect 19 objects in IRS13E from Ks-band images, 15 of which are also detected reliably in the H band. We derive consistent proper motions for these objects from the two bands. Most objects share a similar westward proper motion. We characterize the objects using spectroscopy (1.45-2.45 µm) and (narrowband) imaging from the H (1.66 µm) to the L' band (3.80 µm). Nine of the objects detected in both the Ks and H bands are very red, and we find that they are all consistent with being warm dust clumps. The dust emission may be caused by the colliding winds of the two Wolf-Rayet stars in the cluster. Three of the six detected stars do not share the motion or spectral properties of the three bright stars. This leaves only the three bright, early-type stars as potential cluster members. It is unlikely that these stars are a chance configuration. Assuming the presence of an intermediate mass black hole (IMBH), a mass of about 14,000 M follows from the velocities and positions of these three stars. However, our acceleration limits make such an IMBH nearly as unlikely as a chance occurrence of such a star association. Furthermore, there is no variable X-ray source in IRS13E despite the high density of dust and gas. Therefore, we conclude that is unlikely that IRS13E hosts a black hole massive enough to bind the three stars.

Abstract Copyright:

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

CDS comments: Sources E7, E8 are not in SIMBAD (no coord.). In table 1: objects EN.N in IRS 13 are not in SIMBAD either (no coord.)

Simbad objects: 15

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Number of rows : 15

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 98 0
2 GCIRS 2L * 17 45 39.778 -29 00 32.11           ~ 22 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 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 39 0
6 GCIRS 13E3 ** 17 45 39.8038 -29 00 29.627           ~ 25 1
7 GCIRS 13E3N IR 17 45 39.806 -29 00 29.35           ~ 10 1
8 GCIRS 13E3c IR 17 45 39.808 -29 00 29.48           ~ 10 1
9 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 35 0
10 GCIRS 13E1 s*b 17 45 39.8166 -29 00 29.730           B0/1I 30 0
11 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 302 0
12 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3448 3
13 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
14 HD 193793 WR* 20 20 27.9763345925 +43 51 16.289775091 6.90 7.25 6.85 4.58   WC7p+O5 649 1
15 GCIRS 13E6 * ~ ~           O5V 6 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-06:34:52

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